[Clang][HLSL] Add environment parameter to availability attribute (#89809)

Add `environment` parameter to Clang availability attribute. The allowed
values for this parameter are a subset of values allowed in the
`llvm::Triple` environment component. If the `environment` parameters is
present, the declared availability attribute applies only to targets
with the same platform and environment.

This new parameter will be initially used for annotating HLSL functions
for the `shadermodel` platform because in HLSL built-in function
availability can depend not just on the shader model version (mapped to
`llvm::Triple::OSType`) but also on the target shader stage (mapped to
`llvm::Triple::EnvironmentType`). See example in #89802 and
microsoft/hlsl-specs#204 for more details.

The environment parameter is currently supported only for HLSL.

Fixes #89802

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index f2b9202..557fe106 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2879,7 +2879,7 @@ static bool mergeDeclAttribute(Sema &S, NamedDecl *D,
         D, *AA, AA->getPlatform(), AA->isImplicit(), AA->getIntroduced(),
         AA->getDeprecated(), AA->getObsoleted(), AA->getUnavailable(),
         AA->getMessage(), AA->getStrict(), AA->getReplacement(), AMK,
-        AA->getPriority());
+        AA->getPriority(), AA->getEnvironment());
   else if (const auto *VA = dyn_cast<VisibilityAttr>(Attr))
     NewAttr = S.mergeVisibilityAttr(D, *VA, VA->getVisibility());
   else if (const auto *VA = dyn_cast<TypeVisibilityAttr>(Attr))