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[clang][Sema][FMV] Add a note to the 'cannot become multiversioned' diagnostic #124364

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Merged
merged 1 commit into from
Jan 27, 2025
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[clang][Sema][FMV] Add a note to the 'cannot become multiversioned' diagnostic #124364

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7 changes: 5 additions & 2 deletions clang/lib/Sema/SemaDecl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11380,8 +11380,11 @@ static bool CheckMultiVersionAdditionalRules(Sema &S, const FunctionDecl *OldFD,
return true;

// Only allow transition to MultiVersion if it hasn't been used.
if (OldFD && CausesMV && OldFD->isUsed(false))
return S.Diag(NewFD->getLocation(), diag::err_multiversion_after_used);
if (OldFD && CausesMV && OldFD->isUsed(false)) {
S.Diag(NewFD->getLocation(), diag::err_multiversion_after_used);
S.Diag(OldFD->getLocation(), diag::note_previous_declaration);
return true;
}

return S.areMultiversionVariantFunctionsCompatible(
OldFD, NewFD, S.PDiag(diag::err_multiversion_noproto),
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3 changes: 2 additions & 1 deletion clang/test/Sema/attr-cpuspecific.c
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Expand Up @@ -44,7 +44,8 @@ int allow_fwd_decl2(void);
void use_fwd_decl(void) {
allow_fwd_decl2();
}
// expected-error@+1 {{function declaration cannot become a multiversioned function after first usage}}
// expected-error@+2 {{function declaration cannot become a multiversioned function after first usage}}
// expected-note@-5 {{previous declaration is here}}
int __attribute__((cpu_dispatch(atom))) allow_fwd_decl2(void) {}


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3 changes: 2 additions & 1 deletion clang/test/Sema/attr-target-mv.c
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Expand Up @@ -66,7 +66,8 @@ int use3(void) {
return mv_after_use();
}

// expected-error@+1 {{function declaration cannot become a multiversioned function after first usage}}
// expected-error@+2 {{function declaration cannot become a multiversioned function after first usage}}
// expected-note@-6 {{previous declaration is here}}
int __attribute__((target("arch=sandybridge"))) mv_after_use(void) { return 2; }

int __attribute__((target("sse4.2,arch=sandybridge"))) mangle(void) { return 1; }
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3 changes: 2 additions & 1 deletion clang/test/Sema/attr-target-version.c
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Expand Up @@ -88,7 +88,8 @@ int bar() {
nodef();
return def();
}
// expected-error@+1 {{function declaration cannot become a multiversioned function after first usage}}
// expected-error@+2 {{function declaration cannot become a multiversioned function after first usage}}
// expected-note@-13 {{previous declaration is here}}
int __attribute__((target_version("sha2"))) def(void) { return 1; }

int __attribute__((target_version("sve"))) prot();
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