Rename the `CheckPIESupported` helper functions so that they
don't clobber other internal functions. Also rename them to
document they can't be unified with `CheckCompilerFlag`.
Fixes: #21497
Fix the language checks added by commit 90dead024c (CheckCompilerFlag:
unified way to check compiler flags per language, 2020-09-25,
v3.19.0-rc1~88^2), commit 10ae907de0 (CheckSoureCompiles: Add a unified
way to check if a source compiles, 2020-09-14, v3.19.0-rc1~118^2~1), and
commit 357e2ef429 (CheckSoureRuns: Add a unified way to check if a
source runs, 2020-09-14, v3.19.0-rc1~118^2) to work when variables of
the language names are set.
Fixes: #21500
If the user specifies CMAKE_CUDA_ARCHITECTURES we use those during detection
and error out if they don't work.
For Visual Studio a dummy project file is used instead of invoking the compiler
directly. NVCC would thus use its default and we'd fail if
CMAKE_CUDA_ARCHITECTURES was anything other than NVCC's default.
Use the necessary project file variable in CMakeDetermineCompilerId.cmake to
match other generators.
Fixes#21492.
Finding the toolkit is required for Clang and is assumed to have been correctly
found by FindCUDAToolkit if the CUDA language is found.
Error out early with an useful error instead of failing later on due to the
path not being set.
version.txt is gone from CUDA 11.1 installations, but the rest is the same.
Instead of looking for version.txt look for <CUDA path>/nvvm/libdevice, which
is the main thing that Clang requires (though it also checks for the existence
of bin and include).
Fixes#21353.
Revert commit a064b18f85 (FindGTest: Allow either "Debug" or "Release"
configurations., 2020-06-29, v3.19.0-rc1~584^2). If both configurations
are found then `GTEST_LIBRARY` is populated in a way that breaks
`__gtest_determine_library_type`, and the imported target is not
created correctly.
Fixes: #21473
Issue: #17799
Revert commit 74b1c9fc8e (Explicitly specify language flag when source
LANGUAGE property is set, 2020-06-01, v3.19.0-rc1~722^2) and the lookup
tables from its two immediate ancestors. The purpose of that change was
to convert an explicit `LANGUAGE` source file property into an explicit
language specification compiler flag like `-x c`. This seems reasonable
since the property is documented as meaning "indicate what programming
language the source file is". It is also needed to help compilers deal
with non-standard source file extensions they don't recognize.
However, some projects have been setting `LANGUAGE C` on `.S` assembler
source files to mean "use the C compiler". Passing `-x c` for them
breaks the build because the `.S` sources are not written in C. These
projects should be updated to use `enable_language(ASM)`, for which
CMake often chooses the C compiler as the assembler when using
toolchains that support it (which would have to be the case for projects
using the approach).
Revert the change for now to preserve the old behavior for such projects.
We can re-introduce it with a policy in a future version of CMake.
Fixes: #21469
Issue: #14516, #20716
The `/GR` flag has been on by default since MSVC cl 14.0 from VS 2005.
Remove it from the default flags to make it easier for projects to pass
`/GR-` themselves to turn it off.
Projects may be using string processing to replace `/GR` with another
flag, so we cannot simply drop it. Add a policy to drop it in a
compatible way.
Fixes: #21428
When targeting a platform that supports multiple architectures, Xcode
may choose to build all of them in our small compiler id project.
Update the regex we use to extract the path to the compiler from
the Xcode output to account for this.
Fixes: #21425
In commit b6c60f14b6 (macOS: Default to arm64 architecture on Apple
Silicon hosts, 2020-09-28, v3.19.0-rc1~63^2) we forgot to update the
compiler id architecture selection added by commit 26673bf480 (Xcode:
Explicitly specify default native architecture on macOS, 2020-07-16,
v3.18.1~20^2).
Issue: #21425
Brad King