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CUDA: Fix CUDA_ARCHITECTURES policy CMP0104 check in try_compile

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Since commit e98588aaba (CUDA: Add CUDA_ARCHITECTURES target property,
2020-03-12), `CMAKE_CUDA_ARCHITECTURES` is both initialized and required
by policy CMP0104's `NEW` behavior.  Inside a `try_compile` project we
use `cmake_minimum_required(VERSION ...)` with the current running
version of CMake.  Now that our version number is 3.18, `CMP0104` gets
set to `NEW` in the `try_compile`.  If the outer projects does not set
the policy then `CMAKE_CUDA_ARCHITECTURES` is not available and the
`try_compile` fails to generate.

Teach `try_compile` to check the outer project's policy status and
set policy CMP0104 to `OLD` if needed to match.

Fixes: #20794
This commit is contained in:
Brad King
2020-06-05 10:04:50 -04:00
parent 7934352e44
commit 5bf9a290e7
1 changed files with 8 additions and 0 deletions
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8
Source/cmCoreTryCompile.cxx
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@@ -567,6 +567,14 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv,
*msvcRuntimeLibraryDefault ? "NEW" : "OLD");
}
/* Set CUDA architectures policy to match outer project. */
if (this->Makefile->GetPolicyStatus(cmPolicies::CMP0104) !=
cmPolicies::NEW &&
testLangs.find("CUDA") != testLangs.end() &&
this->Makefile->GetSafeDefinition(kCMAKE_CUDA_ARCHITECTURES).empty()) {
fprintf(fout, "cmake_policy(SET CMP0104 OLD)\n");
}
std::string projectLangs;
for (std::string const& li : testLangs) {
projectLangs += " " + li;