Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
May 21, 2025
Merged

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

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
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
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 6 additions & 1 deletion clang/lib/Sema/SemaDecl.cpp
View file
Open in desktop
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)))) {
Copy link
Member

@Artem-B Artem-B May 2, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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;
Expand Down
1 change: 1 addition & 0 deletions clang/test/Sema/Inputs/builtin-system-header.h
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
#define MACRO(x,y) _InterlockedOr64(x,y);
8 changes: 8 additions & 0 deletions clang/test/Sema/builtin-system-header.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -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);
}