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650 lines
23 KiB
650 lines
23 KiB
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include "cmTargetLinkLibrariesCommand.h"
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#include <cassert>
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#include <memory>
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#include <sstream>
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#include <unordered_set>
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#include <utility>
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#include <cm/optional>
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#include <cm/string_view>
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#include "cmExecutionStatus.h"
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#include "cmGeneratorExpression.h"
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#include "cmGlobalGenerator.h"
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#include "cmListFileCache.h"
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#include "cmMakefile.h"
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#include "cmMessageType.h"
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#include "cmPolicies.h"
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#include "cmState.h"
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#include "cmStateTypes.h"
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#include "cmStringAlgorithms.h"
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#include "cmSystemTools.h"
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#include "cmTarget.h"
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#include "cmTargetLinkLibraryType.h"
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#include "cmValue.h"
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#include "cmake.h"
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namespace {
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enum ProcessingState
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{
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ProcessingLinkLibraries,
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ProcessingPlainLinkInterface,
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ProcessingKeywordLinkInterface,
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ProcessingPlainPublicInterface,
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ProcessingKeywordPublicInterface,
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ProcessingPlainPrivateInterface,
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ProcessingKeywordPrivateInterface
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};
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const char* LinkLibraryTypeNames[3] = { "general", "debug", "optimized" };
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struct TLL
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{
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cmMakefile& Makefile;
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cmTarget* Target;
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bool WarnRemoteInterface = false;
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bool RejectRemoteLinking = false;
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bool EncodeRemoteReference = false;
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std::string DirectoryId;
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std::unordered_set<std::string> Props;
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TLL(cmMakefile& mf, cmTarget* target);
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~TLL();
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bool HandleLibrary(ProcessingState currentProcessingState,
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const std::string& lib, cmTargetLinkLibraryType llt);
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void AppendProperty(std::string const& prop, std::string const& value);
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void AffectsProperty(std::string const& prop);
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};
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} // namespace
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static void LinkLibraryTypeSpecifierWarning(cmMakefile& mf, int left,
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int right);
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bool cmTargetLinkLibrariesCommand(std::vector<std::string> const& args,
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cmExecutionStatus& status)
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{
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// Must have at least one argument.
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if (args.empty()) {
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status.SetError("called with incorrect number of arguments");
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return false;
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}
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cmMakefile& mf = status.GetMakefile();
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// Alias targets cannot be on the LHS of this command.
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if (mf.IsAlias(args[0])) {
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status.SetError("can not be used on an ALIAS target.");
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return false;
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}
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// Lookup the target for which libraries are specified.
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cmTarget* target =
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mf.GetCMakeInstance()->GetGlobalGenerator()->FindTarget(args[0]);
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if (!target) {
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for (const auto& importedTarget : mf.GetOwnedImportedTargets()) {
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if (importedTarget->GetName() == args[0]) {
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target = importedTarget.get();
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break;
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}
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}
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}
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if (!target) {
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MessageType t = MessageType::FATAL_ERROR; // fail by default
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std::ostringstream e;
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e << "Cannot specify link libraries for target \"" << args[0] << "\" "
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<< "which is not built by this project.";
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// The bad target is the only argument. Check how policy CMP0016 is set,
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// and accept, warn or fail respectively:
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if (args.size() < 2) {
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switch (mf.GetPolicyStatus(cmPolicies::CMP0016)) {
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case cmPolicies::WARN:
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t = MessageType::AUTHOR_WARNING;
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// Print the warning.
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e << "\n"
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<< "CMake does not support this but it used to work accidentally "
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<< "and is being allowed for compatibility."
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<< "\n"
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<< cmPolicies::GetPolicyWarning(cmPolicies::CMP0016);
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break;
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case cmPolicies::OLD: // OLD behavior does not warn.
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t = MessageType::MESSAGE;
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break;
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case cmPolicies::REQUIRED_IF_USED:
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case cmPolicies::REQUIRED_ALWAYS:
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e << "\n" << cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0016);
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break;
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case cmPolicies::NEW: // NEW behavior prints the error.
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break;
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}
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}
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// Now actually print the message.
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switch (t) {
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case MessageType::AUTHOR_WARNING:
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mf.IssueMessage(MessageType::AUTHOR_WARNING, e.str());
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break;
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case MessageType::FATAL_ERROR:
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mf.IssueMessage(MessageType::FATAL_ERROR, e.str());
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cmSystemTools::SetFatalErrorOccurred();
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break;
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default:
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break;
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}
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return true;
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}
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// Having a UTILITY library on the LHS is a bug.
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if (target->GetType() == cmStateEnums::UTILITY) {
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std::ostringstream e;
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const char* modal = nullptr;
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MessageType messageType = MessageType::AUTHOR_WARNING;
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switch (mf.GetPolicyStatus(cmPolicies::CMP0039)) {
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case cmPolicies::WARN:
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e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0039) << "\n";
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modal = "should";
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CM_FALLTHROUGH;
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case cmPolicies::OLD:
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break;
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case cmPolicies::REQUIRED_ALWAYS:
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case cmPolicies::REQUIRED_IF_USED:
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case cmPolicies::NEW:
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modal = "must";
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messageType = MessageType::FATAL_ERROR;
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break;
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}
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if (modal) {
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e << "Utility target \"" << target->GetName() << "\" " << modal
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<< " not be used as the target of a target_link_libraries call.";
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mf.IssueMessage(messageType, e.str());
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if (messageType == MessageType::FATAL_ERROR) {
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return false;
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}
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}
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}
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// But we might not have any libs after variable expansion.
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if (args.size() < 2) {
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return true;
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}
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TLL tll(mf, target);
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// Keep track of link configuration specifiers.
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cmTargetLinkLibraryType llt = GENERAL_LibraryType;
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bool haveLLT = false;
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// Start with primary linking and switch to link interface
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// specification if the keyword is encountered as the first argument.
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ProcessingState currentProcessingState = ProcessingLinkLibraries;
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// Accumulate consectuive non-keyword arguments into one entry in
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// order to handle unquoted generator expressions containing ';'.
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std::size_t genexNesting = 0;
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cm::optional<std::string> currentEntry;
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auto processCurrentEntry = [&]() -> bool {
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// FIXME: Warn about partial genex if genexNesting > 0?
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genexNesting = 0;
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if (currentEntry) {
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assert(!haveLLT);
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if (!tll.HandleLibrary(currentProcessingState, *currentEntry,
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GENERAL_LibraryType)) {
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return false;
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}
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currentEntry = cm::nullopt;
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}
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return true;
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};
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auto extendCurrentEntry = [¤tEntry](std::string const& arg) {
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if (currentEntry) {
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currentEntry = cmStrCat(*currentEntry, ';', arg);
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} else {
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currentEntry = arg;
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}
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};
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// Keep this list in sync with the keyword dispatch below.
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static std::unordered_set<std::string> const keywords{
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"LINK_INTERFACE_LIBRARIES",
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"INTERFACE",
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"LINK_PUBLIC",
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"PUBLIC",
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"LINK_PRIVATE",
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"PRIVATE",
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"debug",
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"optimized",
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"general",
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};
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// Add libraries, note that there is an optional prefix
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// of debug and optimized that can be used.
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for (unsigned int i = 1; i < args.size(); ++i) {
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if (keywords.count(args[i])) {
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// A keyword argument terminates any accumulated partial genex.
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if (!processCurrentEntry()) {
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return false;
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}
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// Process this keyword argument.
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if (args[i] == "LINK_INTERFACE_LIBRARIES") {
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currentProcessingState = ProcessingPlainLinkInterface;
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if (i != 1) {
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mf.IssueMessage(
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MessageType::FATAL_ERROR,
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"The LINK_INTERFACE_LIBRARIES option must appear as the "
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"second argument, just after the target name.");
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return true;
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}
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} else if (args[i] == "INTERFACE") {
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if (i != 1 &&
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currentProcessingState != ProcessingKeywordPrivateInterface &&
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currentProcessingState != ProcessingKeywordPublicInterface &&
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currentProcessingState != ProcessingKeywordLinkInterface) {
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mf.IssueMessage(MessageType::FATAL_ERROR,
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"The INTERFACE, PUBLIC or PRIVATE option must "
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"appear as the second argument, just after the "
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"target name.");
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return true;
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}
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currentProcessingState = ProcessingKeywordLinkInterface;
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} else if (args[i] == "LINK_PUBLIC") {
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if (i != 1 &&
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currentProcessingState != ProcessingPlainPrivateInterface &&
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currentProcessingState != ProcessingPlainPublicInterface) {
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mf.IssueMessage(
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MessageType::FATAL_ERROR,
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"The LINK_PUBLIC or LINK_PRIVATE option must appear as the "
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"second argument, just after the target name.");
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return true;
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}
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currentProcessingState = ProcessingPlainPublicInterface;
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} else if (args[i] == "PUBLIC") {
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if (i != 1 &&
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currentProcessingState != ProcessingKeywordPrivateInterface &&
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currentProcessingState != ProcessingKeywordPublicInterface &&
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currentProcessingState != ProcessingKeywordLinkInterface) {
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mf.IssueMessage(MessageType::FATAL_ERROR,
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"The INTERFACE, PUBLIC or PRIVATE option must "
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"appear as the second argument, just after the "
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"target name.");
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return true;
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}
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currentProcessingState = ProcessingKeywordPublicInterface;
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} else if (args[i] == "LINK_PRIVATE") {
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if (i != 1 &&
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currentProcessingState != ProcessingPlainPublicInterface &&
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currentProcessingState != ProcessingPlainPrivateInterface) {
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mf.IssueMessage(
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MessageType::FATAL_ERROR,
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"The LINK_PUBLIC or LINK_PRIVATE option must appear as the "
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"second argument, just after the target name.");
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return true;
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}
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currentProcessingState = ProcessingPlainPrivateInterface;
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} else if (args[i] == "PRIVATE") {
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if (i != 1 &&
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currentProcessingState != ProcessingKeywordPrivateInterface &&
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currentProcessingState != ProcessingKeywordPublicInterface &&
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currentProcessingState != ProcessingKeywordLinkInterface) {
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mf.IssueMessage(MessageType::FATAL_ERROR,
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"The INTERFACE, PUBLIC or PRIVATE option must "
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"appear as the second argument, just after the "
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"target name.");
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return true;
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}
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currentProcessingState = ProcessingKeywordPrivateInterface;
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} else if (args[i] == "debug") {
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if (haveLLT) {
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LinkLibraryTypeSpecifierWarning(mf, llt, DEBUG_LibraryType);
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}
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llt = DEBUG_LibraryType;
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haveLLT = true;
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} else if (args[i] == "optimized") {
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if (haveLLT) {
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LinkLibraryTypeSpecifierWarning(mf, llt, OPTIMIZED_LibraryType);
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}
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llt = OPTIMIZED_LibraryType;
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haveLLT = true;
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} else if (args[i] == "general") {
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if (haveLLT) {
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LinkLibraryTypeSpecifierWarning(mf, llt, GENERAL_LibraryType);
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}
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llt = GENERAL_LibraryType;
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haveLLT = true;
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}
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} else if (haveLLT) {
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// The link type was specified by the previous argument.
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haveLLT = false;
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assert(!currentEntry);
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if (!tll.HandleLibrary(currentProcessingState, args[i], llt)) {
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return false;
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}
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llt = GENERAL_LibraryType;
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} else {
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// Track the genex nesting level.
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{
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cm::string_view arg = args[i];
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for (std::string::size_type pos = 0; pos < arg.size(); ++pos) {
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cm::string_view cur = arg.substr(pos);
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if (cmHasLiteralPrefix(cur, "$<")) {
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++genexNesting;
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++pos;
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} else if (genexNesting > 0 && cmHasLiteralPrefix(cur, ">")) {
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--genexNesting;
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}
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}
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}
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// Accumulate this argument in the current entry.
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extendCurrentEntry(args[i]);
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// Process this entry if it does not end inside a genex.
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if (genexNesting == 0) {
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if (!processCurrentEntry()) {
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return false;
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}
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}
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}
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}
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// Process the last accumulated partial genex, if any.
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if (!processCurrentEntry()) {
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return false;
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}
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// Make sure the last argument was not a library type specifier.
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if (haveLLT) {
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mf.IssueMessage(MessageType::FATAL_ERROR,
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cmStrCat("The \"", LinkLibraryTypeNames[llt],
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"\" argument must be followed by a library."));
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cmSystemTools::SetFatalErrorOccurred();
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}
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const cmPolicies::PolicyStatus policy22Status =
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target->GetPolicyStatusCMP0022();
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// If any of the LINK_ options were given, make sure the
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// LINK_INTERFACE_LIBRARIES target property exists.
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// Use of any of the new keywords implies awareness of
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// this property. And if no libraries are named, it should
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// result in an empty link interface.
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if ((policy22Status == cmPolicies::OLD ||
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policy22Status == cmPolicies::WARN) &&
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currentProcessingState != ProcessingLinkLibraries &&
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!target->GetProperty("LINK_INTERFACE_LIBRARIES")) {
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target->SetProperty("LINK_INTERFACE_LIBRARIES", "");
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}
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return true;
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}
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static void LinkLibraryTypeSpecifierWarning(cmMakefile& mf, int left,
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int right)
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{
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mf.IssueMessage(
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MessageType::AUTHOR_WARNING,
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cmStrCat(
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"Link library type specifier \"", LinkLibraryTypeNames[left],
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"\" is followed by specifier \"", LinkLibraryTypeNames[right],
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"\" instead of a library name. The first specifier will be ignored."));
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}
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namespace {
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TLL::TLL(cmMakefile& mf, cmTarget* target)
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: Makefile(mf)
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, Target(target)
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{
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if (&this->Makefile != this->Target->GetMakefile()) {
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// The LHS target was created in another directory.
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switch (this->Makefile.GetPolicyStatus(cmPolicies::CMP0079)) {
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case cmPolicies::WARN:
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this->WarnRemoteInterface = true;
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CM_FALLTHROUGH;
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case cmPolicies::OLD:
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this->RejectRemoteLinking = true;
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break;
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case cmPolicies::REQUIRED_ALWAYS:
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case cmPolicies::REQUIRED_IF_USED:
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case cmPolicies::NEW:
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this->EncodeRemoteReference = true;
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break;
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}
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}
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if (this->EncodeRemoteReference) {
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cmDirectoryId const dirId = this->Makefile.GetDirectoryId();
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this->DirectoryId = cmStrCat(CMAKE_DIRECTORY_ID_SEP, dirId.String);
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}
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}
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bool TLL::HandleLibrary(ProcessingState currentProcessingState,
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const std::string& lib, cmTargetLinkLibraryType llt)
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{
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if (this->Target->GetType() == cmStateEnums::INTERFACE_LIBRARY &&
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currentProcessingState != ProcessingKeywordLinkInterface) {
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this->Makefile.IssueMessage(
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MessageType::FATAL_ERROR,
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"INTERFACE library can only be used with the INTERFACE keyword of "
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"target_link_libraries");
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return false;
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}
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if (this->Target->IsImported() &&
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currentProcessingState != ProcessingKeywordLinkInterface) {
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this->Makefile.IssueMessage(
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MessageType::FATAL_ERROR,
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"IMPORTED library can only be used with the INTERFACE keyword of "
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"target_link_libraries");
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return false;
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}
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cmTarget::TLLSignature sig =
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(currentProcessingState == ProcessingPlainPrivateInterface ||
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currentProcessingState == ProcessingPlainPublicInterface ||
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currentProcessingState == ProcessingKeywordPrivateInterface ||
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currentProcessingState == ProcessingKeywordPublicInterface ||
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currentProcessingState == ProcessingKeywordLinkInterface)
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? cmTarget::KeywordTLLSignature
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: cmTarget::PlainTLLSignature;
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if (!this->Target->PushTLLCommandTrace(
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sig, this->Makefile.GetBacktrace().Top())) {
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std::ostringstream e;
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const char* modal = nullptr;
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MessageType messageType = MessageType::AUTHOR_WARNING;
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switch (this->Makefile.GetPolicyStatus(cmPolicies::CMP0023)) {
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case cmPolicies::WARN:
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e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0023) << "\n";
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modal = "should";
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CM_FALLTHROUGH;
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case cmPolicies::OLD:
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break;
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case cmPolicies::REQUIRED_ALWAYS:
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case cmPolicies::REQUIRED_IF_USED:
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case cmPolicies::NEW:
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modal = "must";
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messageType = MessageType::FATAL_ERROR;
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break;
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}
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if (modal) {
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// If the sig is a keyword form and there is a conflict, the existing
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// form must be the plain form.
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const char* existingSig =
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(sig == cmTarget::KeywordTLLSignature ? "plain" : "keyword");
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e << "The " << existingSig
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<< " signature for target_link_libraries has "
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"already been used with the target \""
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<< this->Target->GetName()
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<< "\". All uses of target_link_libraries with a target " << modal
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<< " be either all-keyword or all-plain.\n";
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this->Target->GetTllSignatureTraces(e,
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sig == cmTarget::KeywordTLLSignature
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? cmTarget::PlainTLLSignature
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: cmTarget::KeywordTLLSignature);
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this->Makefile.IssueMessage(messageType, e.str());
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if (messageType == MessageType::FATAL_ERROR) {
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return false;
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}
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}
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}
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// Handle normal case where the command was called with another keyword than
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// INTERFACE / LINK_INTERFACE_LIBRARIES or none at all. (The "LINK_LIBRARIES"
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// property of the target on the LHS shall be populated.)
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if (currentProcessingState != ProcessingKeywordLinkInterface &&
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currentProcessingState != ProcessingPlainLinkInterface) {
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if (this->RejectRemoteLinking) {
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this->Makefile.IssueMessage(
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MessageType::FATAL_ERROR,
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cmStrCat("Attempt to add link library \"", lib, "\" to target \"",
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this->Target->GetName(),
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"\" which is not built in this "
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"directory.\nThis is allowed only when policy CMP0079 "
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"is set to NEW."));
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return false;
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}
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cmTarget* tgt = this->Makefile.GetGlobalGenerator()->FindTarget(lib);
|
|
|
|
if (tgt && (tgt->GetType() != cmStateEnums::STATIC_LIBRARY) &&
|
|
(tgt->GetType() != cmStateEnums::SHARED_LIBRARY) &&
|
|
(tgt->GetType() != cmStateEnums::UNKNOWN_LIBRARY) &&
|
|
(tgt->GetType() != cmStateEnums::OBJECT_LIBRARY) &&
|
|
(tgt->GetType() != cmStateEnums::INTERFACE_LIBRARY) &&
|
|
!tgt->IsExecutableWithExports()) {
|
|
this->Makefile.IssueMessage(
|
|
MessageType::FATAL_ERROR,
|
|
cmStrCat(
|
|
"Target \"", lib, "\" of type ",
|
|
cmState::GetTargetTypeName(tgt->GetType()),
|
|
" may not be linked into another target. One may link only to "
|
|
"INTERFACE, OBJECT, STATIC or SHARED libraries, or to ",
|
|
"executables with the ENABLE_EXPORTS property set."));
|
|
}
|
|
|
|
this->AffectsProperty("LINK_LIBRARIES");
|
|
this->Target->AddLinkLibrary(this->Makefile, lib, llt);
|
|
}
|
|
|
|
if (this->WarnRemoteInterface) {
|
|
this->Makefile.IssueMessage(
|
|
MessageType::AUTHOR_WARNING,
|
|
cmStrCat(
|
|
cmPolicies::GetPolicyWarning(cmPolicies::CMP0079), "\nTarget\n ",
|
|
this->Target->GetName(),
|
|
"\nis not created in this "
|
|
"directory. For compatibility with older versions of CMake, link "
|
|
"library\n ",
|
|
lib,
|
|
"\nwill be looked up in the directory in which "
|
|
"the target was created rather than in this calling directory."));
|
|
}
|
|
|
|
// Handle (additional) case where the command was called with PRIVATE /
|
|
// LINK_PRIVATE and stop its processing. (The "INTERFACE_LINK_LIBRARIES"
|
|
// property of the target on the LHS shall only be populated if it is a
|
|
// STATIC library.)
|
|
if (currentProcessingState == ProcessingKeywordPrivateInterface ||
|
|
currentProcessingState == ProcessingPlainPrivateInterface) {
|
|
if (this->Target->GetType() == cmStateEnums::STATIC_LIBRARY ||
|
|
this->Target->GetType() == cmStateEnums::OBJECT_LIBRARY) {
|
|
std::string configLib =
|
|
this->Target->GetDebugGeneratorExpressions(lib, llt);
|
|
if (cmGeneratorExpression::IsValidTargetName(lib) ||
|
|
cmGeneratorExpression::Find(lib) != std::string::npos) {
|
|
configLib = "$<LINK_ONLY:" + configLib + ">";
|
|
}
|
|
this->AppendProperty("INTERFACE_LINK_LIBRARIES", configLib);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Handle general case where the command was called with another keyword than
|
|
// PRIVATE / LINK_PRIVATE or none at all. (The "INTERFACE_LINK_LIBRARIES"
|
|
// property of the target on the LHS shall be populated.)
|
|
this->AppendProperty("INTERFACE_LINK_LIBRARIES",
|
|
this->Target->GetDebugGeneratorExpressions(lib, llt));
|
|
|
|
// Stop processing if called without any keyword.
|
|
if (currentProcessingState == ProcessingLinkLibraries) {
|
|
return true;
|
|
}
|
|
// Stop processing if policy CMP0022 is set to NEW.
|
|
const cmPolicies::PolicyStatus policy22Status =
|
|
this->Target->GetPolicyStatusCMP0022();
|
|
if (policy22Status != cmPolicies::OLD &&
|
|
policy22Status != cmPolicies::WARN) {
|
|
return true;
|
|
}
|
|
// Stop processing if called with an INTERFACE library on the LHS.
|
|
if (this->Target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
|
|
return true;
|
|
}
|
|
|
|
// Handle (additional) backward-compatibility case where the command was
|
|
// called with PUBLIC / INTERFACE / LINK_PUBLIC / LINK_INTERFACE_LIBRARIES.
|
|
// (The policy CMP0022 is not set to NEW.)
|
|
{
|
|
// Get the list of configurations considered to be DEBUG.
|
|
std::vector<std::string> debugConfigs =
|
|
this->Makefile.GetCMakeInstance()->GetDebugConfigs();
|
|
std::string prop;
|
|
|
|
// Include this library in the link interface for the target.
|
|
if (llt == DEBUG_LibraryType || llt == GENERAL_LibraryType) {
|
|
// Put in the DEBUG configuration interfaces.
|
|
for (std::string const& dc : debugConfigs) {
|
|
prop = cmStrCat("LINK_INTERFACE_LIBRARIES_", dc);
|
|
this->AppendProperty(prop, lib);
|
|
}
|
|
}
|
|
if (llt == OPTIMIZED_LibraryType || llt == GENERAL_LibraryType) {
|
|
// Put in the non-DEBUG configuration interfaces.
|
|
this->AppendProperty("LINK_INTERFACE_LIBRARIES", lib);
|
|
|
|
// Make sure the DEBUG configuration interfaces exist so that the
|
|
// general one will not be used as a fall-back.
|
|
for (std::string const& dc : debugConfigs) {
|
|
prop = cmStrCat("LINK_INTERFACE_LIBRARIES_", dc);
|
|
if (!this->Target->GetProperty(prop)) {
|
|
this->Target->SetProperty(prop, "");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void TLL::AppendProperty(std::string const& prop, std::string const& value)
|
|
{
|
|
this->AffectsProperty(prop);
|
|
this->Target->AppendProperty(prop, value, this->Makefile.GetBacktrace());
|
|
}
|
|
|
|
void TLL::AffectsProperty(std::string const& prop)
|
|
{
|
|
if (!this->EncodeRemoteReference) {
|
|
return;
|
|
}
|
|
// Add a wrapper to the expression to tell LookupLinkItem to look up
|
|
// names in the caller's directory.
|
|
if (this->Props.insert(prop).second) {
|
|
this->Target->AppendProperty(prop, this->DirectoryId,
|
|
this->Makefile.GetBacktrace());
|
|
}
|
|
}
|
|
|
|
TLL::~TLL()
|
|
{
|
|
for (std::string const& prop : this->Props) {
|
|
this->Target->AppendProperty(prop, CMAKE_DIRECTORY_ID_SEP,
|
|
this->Makefile.GetBacktrace());
|
|
}
|
|
}
|
|
|
|
} // namespace
|