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| author | Brad King <brad.king@kitware.com> | 2020-11-19 21:12:01 (GMT) |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2020-12-02 16:39:11 (GMT) |
| commit | 48aac247e922409b4dfe7189521661df4b0583d1 (patch) | |
| tree | 301bf76353bb9a6c00293163358b272f1b50d317 /Modules/Compiler/Clang-C.cmake | |
| parent | 2e67a75acdbdec24a4e14b2550b846f3ca916de0 (diff) | |
| download | CMake-48aac247e922409b4dfe7189521661df4b0583d1.zip CMake-48aac247e922409b4dfe7189521661df4b0583d1.tar.gz CMake-48aac247e922409b4dfe7189521661df4b0583d1.tar.bz2 | |
Compile with explicit language flag when source LANGUAGE property is set
This change was originally made by commit 74b1c9fc8e (Explicitly specify
language flag when source LANGUAGE property is set, 2020-06-01,
v3.19.0-rc1~722^2), but it was reverted by commit 30aa715fac (Revert
"specify language flag when source LANGUAGE property is set",
2020-11-19) to restore compatibility with pre-3.19 behavior.
Implement the change again, but add policy CMP0119 to make this change
while preserving compatibility with existing projects.
Note that the `Compiler/{Clang,Intel,MSVC}-CXX` modules do not need to
specify `-TP` for their MSVC-like variants because we already use the
flag in `CMAKE_CXX_COMPILE_OBJECT`. Similarly for `Compiler/XL-CXX`
and `Platform/Windows-Embarcadero`.
Note also that this does not seem possible to implement for XL C.
Even with `-qsourcetype=c`, `xlc` complains about an unknown suffix:
`1501-218 (W) file /.../AltExtC.zzz contains an incorrect file suffix`.
It returns non-zero even with `-qsuppress=1501-218`.
Co-Author: Robert Maynard <robert.maynard@kitware.com>
Fixes: #14516, #20716
Diffstat (limited to 'Modules/Compiler/Clang-C.cmake')
| -rw-r--r-- | Modules/Compiler/Clang-C.cmake | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Modules/Compiler/Clang-C.cmake b/Modules/Compiler/Clang-C.cmake index a631ac0..5609abf 100644 --- a/Modules/Compiler/Clang-C.cmake +++ b/Modules/Compiler/Clang-C.cmake @@ -7,6 +7,7 @@ if(APPLE AND NOT appleClangPolicy STREQUAL NEW) endif() if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC") + set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TC) set(CMAKE_C_CLANG_TIDY_DRIVER_MODE "cl") if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER) AND CMAKE_GENERATOR MATCHES "Makefiles|WMake" @@ -14,6 +15,7 @@ if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC") set(CMAKE_C_DEPENDS_USE_COMPILER TRUE) endif() elseif("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU") + set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c) if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER) AND CMAKE_GENERATOR MATCHES "Makefiles|WMake" AND CMAKE_DEPFILE_FLAGS_C) |