https://github.com/tambry created https://github.com/llvm/llvm-project/pull/167226
It's supported together with the other spellings and results in the same attribute. Document it and prefer it in the documentation as the `asm()` spelling is C++ and GNU-only. See: https://github.com/llvm/llvm-project/pull/167221#issuecomment-3508464545 >From f32e61865569cd1e3cab5c4b81b092b89c4a38a5 Mon Sep 17 00:00:00 2001 From: Raul Tambre <[email protected]> Date: Sun, 9 Nov 2025 17:40:51 +0200 Subject: [PATCH] [clang][doc] Document and prefer __asm as mangled name attribute It's supported together with the other spellings and results in the same attribute. Document it and prefer it in the documentation as the `asm()` spelling is C++ and GNU-only. --- clang/include/clang/Basic/Attr.td | 2 +- clang/include/clang/Basic/AttrDocs.td | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td index 1013bfc575747..da608370645ac 100644 --- a/clang/include/clang/Basic/Attr.td +++ b/clang/include/clang/Basic/Attr.td @@ -1069,7 +1069,7 @@ def AVRSignal : InheritableAttr, TargetSpecificAttr<TargetAVR> { } def AsmLabel : InheritableAttr { - let Spellings = [CustomKeyword<"asm">, CustomKeyword<"__asm__">]; + let Spellings = [CustomKeyword<"asm">, CustomKeyword<"__asm">, CustomKeyword<"__asm__">]; let Args = [ // Label specifies the mangled name for the decl. StringArgument<"Label">, ]; diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td index 1be9a96aa44de..f1dbd8af6093a 100644 --- a/clang/include/clang/Basic/AttrDocs.td +++ b/clang/include/clang/Basic/AttrDocs.td @@ -4295,17 +4295,17 @@ used by other languages. (This prefix is also added to the standard Itanium C++ ABI prefix on "mangled" symbol names, so that e.g. on such targets the true symbol name for a C++ variable declared as ``int cppvar;`` would be ``__Z6cppvar``; note the two underscores.) This prefix is *not* added to the -symbol names specified by the ``asm`` attribute; programmers wishing to match a -C symbol name must compensate for this. +symbol names specified by the ``__asm`` attribute; programmers wishing to match +a C symbol name must compensate for this. For example, consider the following C code: .. code-block:: c - int var1 asm("altvar") = 1; // "altvar" in symbol table. + int var1 __asm("altvar") = 1; // "altvar" in symbol table. int var2 = 1; // "_var2" in symbol table. - void func1(void) asm("altfunc"); + void func1(void) __asm("altfunc"); void func1(void) {} // "altfunc" in symbol table. void func2(void) {} // "_func2" in symbol table. _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
