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[Clang] Use ExtWarn for static local variable in extern inline function (fixes #39524) #166332

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[Clang] Use ExtWarn for static local variable in extern inline function (fixes #39524) #166332

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16414b9
[Clang] Use ExtWarn for static local variable in extern inline functi…
Susikrishna Nov 4, 2025
456e2df
Merge branch 'main' into fix-inline-static-extwarn
Susikrishna Nov 4, 2025
ee314e1
Update clang/test/Sema/inline-static-var.c
Susikrishna Nov 5, 2025
b4abe8e
Update release notes and diagnostics for static local variables in ex…
Susikrishna Nov 5, 2025
d5431b8
Update clang/docs/ReleaseNotes.rst
Susikrishna Nov 5, 2025
544b1ba
Update release note to refer to `inline` functions instead of `extern…
Susikrishna Nov 5, 2025
44c4a48
Update clang/test/Sema/inline-static-var.c
Susikrishna Nov 6, 2025
af464fe
Merge branch 'main' into fix-inline-static-extwarn
Susikrishna Nov 6, 2025
28b67f8
[Clang][Sema] Use Linux triple for inline-static-var.c to ensure cons…
Susikrishna Nov 7, 2025
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8 changes: 5 additions & 3 deletions clang/include/clang/Basic/DiagnosticSemaKinds.td
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Original file line number Diff line number Diff line change
Expand Up @@ -6339,9 +6339,11 @@ def warn_c2y_compat_internal_in_extern_inline : Warning<
"using static %select{function|variable}0 %1 in an inline function with "
"external linkage is incompatible with standards before C2y">,
InGroup<CPre2yCompat>, DefaultIgnore;
def warn_static_local_in_extern_inline : Warning<
"non-constant static local variable in inline function may be different "
"in different files">, InGroup<StaticLocalInInline>;
def warn_static_local_in_extern_inline
: ExtWarn<"non-constant static local variable in inline function may be "
"different "
"in different files">,
InGroup<StaticLocalInInline>;
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@Sirraide Sirraide Nov 5, 2025

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clang-format doesn’t format these properly unfortunately... can you revert all changes here other than changing Warning to ExtWarn?

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@Susikrishna Susikrishna Nov 5, 2025

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Done. Added the release note and reverted unrelated formatting changes.

def note_convert_inline_to_static : Note<
"use 'static' to give inline function %0 internal linkage">;

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7 changes: 7 additions & 0 deletions clang/test/Sema/inline-static-var.c
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@@ -0,0 +1,7 @@
// RUN: %clang_cc1 -std=c11 -Wno-unused-variable -Wno-deprecated-non-prototype -Wno-inline -pedantic-errors -verify %s

inline void f(void) { // expected-note {{use 'static' to give inline function 'f' internal linkage}}
static int x; // expected-error {{non-constant static local variable in inline function may be different in different files}}
}

int main(void) { return 0; }
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