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PCH: Document and test COMPILE_LANGUAGE genex for per-language header

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Fixes: #19839
This commit is contained in:
Brad King 2019-10-16 10:32:56 -04:00
parent 9150c818b7
commit ac75886525
3 changed files with 22 additions and 1 deletions
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4
Help/command/target_precompile_headers.rst
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@ -47,6 +47,9 @@ with the syntax ``$<...>``.
See the :manual:`cmake-generator-expressions(7)` manual for available
expressions. See the :manual:`cmake-compile-features(7)` manual for
information on compile features and a list of supported compilers.
The ``$<COMPILE_LANGUAGE:...>`` generator expression is particularly
useful for specifying a language-specific header to precompile for
only one language (e.g. ``CXX`` and not ``C``).
Usage
^^^^^
@ -56,6 +59,7 @@ Usage
target_precompile_headers(<target>
PUBLIC
project_header.h
"$<$<COMPILE_LANGUAGE:CXX>:cxx_only.h>"
PRIVATE
[["other_header.h"]]
<unordered_map>

14
Tests/RunCMake/PrecompileHeaders/PchMultilanguage-check.cmake
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@ -15,3 +15,17 @@ if (NOT EXISTS ${foobar_pch_hxx_header})
set(RunCMake_TEST_FAILED "Generated foobar C++ pch header ${foobar_pch_hxx_header} does not exist")
return()
endif()
file(STRINGS ${foobar_pch_h_header} foobar_pch_h_header_strings)
if (NOT foobar_pch_h_header_strings MATCHES ";#include <stddef.h>(;|$)")
set(RunCMake_TEST_FAILED "Generated foo pch header\n ${foobar_pch_h_header}\nhas bad content:\n ${foobar_pch_h_header_strings}")
return()
endif()
file(STRINGS ${foobar_pch_hxx_header} foobar_pch_hxx_header_strings)
if (NOT foobar_pch_hxx_header_strings MATCHES ";#include <cstddef>(;|$)")
set(RunCMake_TEST_FAILED "Generated foo pch header\n ${foobar_pch_hxx_header}\nhas bad content:\n ${foobar_pch_hxx_header_strings}")
return()
endif()

5
Tests/RunCMake/PrecompileHeaders/PchMultilanguage.cmake
View File

@ -6,4 +6,7 @@ add_executable(foobar
main.cpp
)
target_include_directories(foobar PUBLIC include)
target_precompile_headers(foobar PRIVATE "<stddef.h>")
target_precompile_headers(foobar PRIVATE
"$<$<COMPILE_LANGUAGE:C>:<stddef.h$<ANGLE-R>>"
"$<$<COMPILE_LANGUAGE:CXX>:<cstddef$<ANGLE-R>>"
)