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[clang][Sema] Declare builtins used in #pragma intrinsic #138205

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Merged
merged 3 commits into from
May 21, 2025
Merged

[clang][Sema] Declare builtins used in #pragma intrinsic #138205

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c66ec11
[clang][Sema] Don't warn for implicit uses of builtins in system headers
sarnex May 1, 2025
36e8a86
rework change to rely on pragma intrinsic
sarnex May 16, 2025
81e5722
declare the builtin if needed
sarnex May 19, 2025
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7 changes: 6 additions & 1 deletion clang/lib/Sema/SemaDecl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2376,9 +2376,14 @@ NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
return nullptr;
}

// Warn for implicit uses of header dependent libraries,
// except in system headers.
if (!ForRedeclaration &&
(Context.BuiltinInfo.isPredefinedLibFunction(ID) ||
Context.BuiltinInfo.isHeaderDependentFunction(ID))) {
Context.BuiltinInfo.isHeaderDependentFunction(ID)) &&
(!getDiagnostics().getSuppressSystemWarnings() ||
!Context.getSourceManager().isInSystemHeader(
Context.getSourceManager().getSpellingLoc(Loc)))) {
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I think we may want to narrow down the scope of which diagnostics we want to suppress and when.
While we do know that we may need it for these builting for windows on ARM, I can not say whether we want to do that to other intrinsics for other targets.

Diag(Loc, LangOpts.C99 ? diag::ext_implicit_lib_function_decl_c99
: diag::ext_implicit_lib_function_decl)
<< Context.BuiltinInfo.getName(ID) << R;
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1 change: 1 addition & 0 deletions clang/test/Sema/Inputs/builtin-system-header.h
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@@ -0,0 +1 @@
#define MACRO(x,y) _InterlockedOr64(x,y);
8 changes: 8 additions & 0 deletions clang/test/Sema/builtin-system-header.c
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@@ -0,0 +1,8 @@
// RUN: %clang_cc1 -fms-extensions -fsyntax-only -verify -triple arm64-windows -isystem %S/Inputs %s

// expected-no-diagnostics
#include <builtin-system-header.h>

void foo() {
MACRO(0,0);
}