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72 lines
2.9 KiB
72 lines
2.9 KiB
11 years ago
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try_compile
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-----------
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Try building some code.
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::
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try_compile(RESULT_VAR <bindir> <srcdir>
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<projectName> [targetName] [CMAKE_FLAGS flags...]
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[OUTPUT_VARIABLE <var>])
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Try building a project. In this form, srcdir should contain a
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complete CMake project with a CMakeLists.txt file and all sources.
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The bindir and srcdir will not be deleted after this command is run.
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Specify targetName to build a specific target instead of the 'all' or
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'ALL_BUILD' target.
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::
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try_compile(RESULT_VAR <bindir> <srcfile|SOURCES srcfile...>
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[CMAKE_FLAGS flags...]
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[COMPILE_DEFINITIONS flags...]
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[LINK_LIBRARIES libs...]
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[OUTPUT_VARIABLE <var>]
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[COPY_FILE <fileName> [COPY_FILE_ERROR <var>]])
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Try building an executable from one or more source files. In this
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form the user need only supply one or more source files that include a
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definition for 'main'. CMake will create a CMakeLists.txt file to
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build the source(s) as an executable. Specify COPY_FILE to get a copy
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of the linked executable at the given fileName and optionally
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COPY_FILE_ERROR to capture any error.
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In this version all files in bindir/CMakeFiles/CMakeTmp will be
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cleaned automatically. For debugging, --debug-trycompile can be
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passed to cmake to avoid this clean. However, multiple sequential
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try_compile operations reuse this single output directory. If you use
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--debug-trycompile, you can only debug one try_compile call at a time.
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The recommended procedure is to configure with cmake all the way
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through once, then delete the cache entry associated with the
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try_compile call of interest, and then re-run cmake again with
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--debug-trycompile.
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Some extra flags that can be included are, INCLUDE_DIRECTORIES,
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LINK_DIRECTORIES, and LINK_LIBRARIES. COMPILE_DEFINITIONS are
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-Ddefinition that will be passed to the compile line.
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The srcfile signature also accepts a LINK_LIBRARIES argument which may
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contain a list of libraries or IMPORTED targets which will be linked
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to in the generated project. If LINK_LIBRARIES is specified as a
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parameter to try_compile, then any LINK_LIBRARIES passed as
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CMAKE_FLAGS will be ignored.
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try_compile creates a CMakeList.txt file on the fly that looks like
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this:
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::
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add_definitions( <expanded COMPILE_DEFINITIONS from calling cmake>)
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include_directories(${INCLUDE_DIRECTORIES})
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link_directories(${LINK_DIRECTORIES})
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add_executable(cmTryCompileExec sources)
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target_link_libraries(cmTryCompileExec ${LINK_LIBRARIES})
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In both versions of the command, if OUTPUT_VARIABLE is specified, then
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the output from the build process is stored in the given variable.
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The success or failure of the try_compile, i.e. TRUE or FALSE
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respectively, is returned in RESULT_VAR. CMAKE_FLAGS can be used to
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pass -DVAR:TYPE=VALUE flags to the cmake that is run during the build.
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Set variable CMAKE_TRY_COMPILE_CONFIGURATION to choose a build
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configuration.
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