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| author | Brad King <brad.king@kitware.com> | 2019-10-16 10:32:56 -0400 |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2019-10-16 10:32:56 -0400 |
| commit | ac75886525c647ef7081dc11f6c0c128463b7ecd (patch) | |
| tree | d34cfd6a5d869bc0674bd2252a165ccb610a8702 | |
| parent | 9150c818b7d2afb868575fcb2e0c9ba62b9d7f85 (diff) | |
| download | cmake-ac75886525c647ef7081dc11f6c0c128463b7ecd.tar.gz | |
PCH: Document and test COMPILE_LANGUAGE genex for per-language header
Fixes: #19839
| -rw-r--r-- | Help/command/target_precompile_headers.rst | 4 | ||||
| -rw-r--r-- | Tests/RunCMake/PrecompileHeaders/PchMultilanguage-check.cmake | 14 | ||||
| -rw-r--r-- | Tests/RunCMake/PrecompileHeaders/PchMultilanguage.cmake | 5 |
3 files changed, 22 insertions, 1 deletions
diff --git a/Help/command/target_precompile_headers.rst b/Help/command/target_precompile_headers.rst index 3a32f4147e..d283948cef 100644 --- a/Help/command/target_precompile_headers.rst +++ b/Help/command/target_precompile_headers.rst @@ -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> diff --git a/Tests/RunCMake/PrecompileHeaders/PchMultilanguage-check.cmake b/Tests/RunCMake/PrecompileHeaders/PchMultilanguage-check.cmake index 44fe2dafa0..e0b753a4e9 100644 --- a/Tests/RunCMake/PrecompileHeaders/PchMultilanguage-check.cmake +++ b/Tests/RunCMake/PrecompileHeaders/PchMultilanguage-check.cmake @@ -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 ${foobar_pch_hxx_header_strings}") + return() +endif() diff --git a/Tests/RunCMake/PrecompileHeaders/PchMultilanguage.cmake b/Tests/RunCMake/PrecompileHeaders/PchMultilanguage.cmake index 7a837daf01..cdc42b2a2d 100644 --- a/Tests/RunCMake/PrecompileHeaders/PchMultilanguage.cmake +++ b/Tests/RunCMake/PrecompileHeaders/PchMultilanguage.cmake @@ -6,4 +6,7 @@ add_executable(foobar main.cpp ) target_include_directories(foobar PUBLIC include) -target_precompile_headers(foobar PRIVATE "<stddef.h>") +target_precompile_headers(foobar PRIVATE + "$<$<COMPILE_LANGUAGE:C>:<stddef.h$<ANGLE-R>>" + "$<$<COMPILE_LANGUAGE:CXX>:<cstddef$<ANGLE-R>>" + ) |