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| author | Brad King <brad.king@kitware.com> | 2021-06-29 16:53:02 (GMT) |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2021-06-29 16:55:35 (GMT) |
| commit | c6aaaf066a39485bf34869ccae5b5d4fac04f0b9 (patch) | |
| tree | f282bf71a39e71131c3cba6324f4b4cea0f8c256 /Modules/CMakeDetermineCXXCompiler.cmake | |
| parent | fb02657b6a4f66cfb1b1673c170136f07945eda2 (diff) | |
| download | CMake-c6aaaf066a39485bf34869ccae5b5d4fac04f0b9.zip CMake-c6aaaf066a39485bf34869ccae5b5d4fac04f0b9.tar.gz CMake-c6aaaf066a39485bf34869ccae5b5d4fac04f0b9.tar.bz2 | |
DetermineCompiler: Restore identification of MSVC with no INCLUDE dirs
Since commit bd844387df (ROCMClang: Add the ROCm toolkit derived clang
compiler to CMake, 2020-08-28, v3.21.0-rc1~66^2~6), our generated
compiler id source file contains a preprocessor condition of the form
#elif ... && __has_include(...)
When MSVC is invoked with no include directories in the `INCLUDE`
environment variable or in `-I` flags, its implementation of
`__has_include` errors out immediately. This breaks identification of
the compiler.
Work around the problem by adding a fallback attempt to compile the
identification source using a dummy include directory.
Diffstat (limited to 'Modules/CMakeDetermineCXXCompiler.cmake')
| -rw-r--r-- | Modules/CMakeDetermineCXXCompiler.cmake | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake index 3d1a7bb..e297f90 100644 --- a/Modules/CMakeDetermineCXXCompiler.cmake +++ b/Modules/CMakeDetermineCXXCompiler.cmake @@ -80,6 +80,10 @@ else() # ARMClang need target options "--target=arm-arm-none-eabi -mcpu=cortex-m3" + + # MSVC needs at least one include directory for __has_include to function, + # but custom toolchains may run MSVC with no INCLUDE env var and no -I flags. + "-I__does_not_exist__" ) endif() |