================
@@ -879,8 +879,21 @@ void AMDGPUToolChain::addClangWarningOptions(ArgStringList
&CC1Args) const {
void AMDGPUToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
- if (DriverArgs.hasArg(options::OPT_nostdinc) ||
- DriverArgs.hasArg(options::OPT_nostdlibinc))
+ if (DriverArgs.hasArg(options::OPT_nostdinc))
+ return;
+
+ // Add clang's builtin headers (`stddef.h`, `float.h`, `stdint.h`, ...).
+ // These are compiler-provided headers, not host libc headers.
+ //
+ // Example: an amdgcn compile may still need `float.h`, but it should come
+ // from clang's resource directory, not from the host system's
`/usr/include`.
+ if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
----------------
jhuber6 wrote:
I thought `nostdlibinc` was supposed to be the canonical method to say 'I only
want the clang builtin headers'? This seems a little redundant. Could
`-Xarch_device -nostdlibinc` work?
https://github.com/llvm/llvm-project/pull/192821
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