You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
1.8 KiB
63 lines
1.8 KiB
4 years ago
|
CMAKE_MESSAGE_CONTEXT
|
||
|
|
---------------------
|
||
|
|
|
||
|
|
When enabled by the :manual:`cmake <cmake(1)>` ``--log-context`` command line
|
||
|
|
option or the :variable:`CMAKE_MESSAGE_CONTEXT_SHOW` variable, the
|
||
|
|
:command:`message` command converts the ``CMAKE_MESSAGE_CONTEXT`` list into a
|
||
|
|
dot-separated string surrounded by square brackets and prepends it to each line
|
||
|
|
for messages of log levels ``NOTICE`` and below.
|
||
|
|
|
||
|
|
For logging contexts to work effectively, projects should generally
|
||
|
|
``APPEND`` and ``POP_BACK`` an item to the current value of
|
||
|
|
``CMAKE_MESSAGE_CONTEXT`` rather than replace it.
|
||
|
|
Projects should not assume the message context at the top of the source tree
|
||
|
|
is empty, as there are scenarios where the context might have already been set
|
||
|
|
(e.g. hierarchical projects).
|
||
|
|
|
||
|
|
.. warning::
|
||
|
|
|
||
|
|
Valid context names are restricted to anything that could be used
|
||
|
|
as a CMake variable name. All names that begin with an underscore
|
||
|
|
or the string ``cmake_`` are also reserved for use by CMake and
|
||
|
|
should not be used by projects.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
.. code-block:: cmake
|
||
|
|
|
||
|
|
function(bar)
|
||
|
|
list(APPEND CMAKE_MESSAGE_CONTEXT "bar")
|
||
|
|
message(VERBOSE "bar VERBOSE message")
|
||
|
|
endfunction()
|
||
|
|
|
||
|
|
function(baz)
|
||
|
|
list(APPEND CMAKE_MESSAGE_CONTEXT "baz")
|
||
|
|
message(DEBUG "baz DEBUG message")
|
||
|
|
endfunction()
|
||
|
|
|
||
|
|
function(foo)
|
||
|
|
list(APPEND CMAKE_MESSAGE_CONTEXT "foo")
|
||
|
|
bar()
|
||
|
|
message(TRACE "foo TRACE message")
|
||
|
|
baz()
|
||
|
|
endfunction()
|
||
|
|
|
||
|
|
list(APPEND CMAKE_MESSAGE_CONTEXT "top")
|
||
|
|
|
||
|
|
message(VERBOSE "Before `foo`")
|
||
|
|
foo()
|
||
|
|
message(VERBOSE "After `foo`")
|
||
|
|
|
||
|
|
list(POP_BACK CMAKE_MESSAGE_CONTEXT)
|
||
|
|
|
||
|
|
|
||
|
|
Which results in the following output:
|
||
|
|
|
||
|
|
.. code-block:: none
|
||
|
|
|
||
|
|
-- [top] Before `foo`
|
||
|
|
-- [top.foo.bar] bar VERBOSE message
|
||
|
|
-- [top.foo] foo TRACE message
|
||
|
|
-- [top.foo.baz] baz DEBUG message
|
||
|
|
-- [top] After `foo`
|