diff options
Diffstat (limited to 'clang/lib/Sema/SemaDecl.cpp')
| -rw-r--r-- | clang/lib/Sema/SemaDecl.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp index 7c54986f568..c3fdd900cd0 100644 --- a/clang/lib/Sema/SemaDecl.cpp +++ b/clang/lib/Sema/SemaDecl.cpp @@ -6111,6 +6111,22 @@ Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, } } + // Special handling of variable named 'main'. + if (Name.isIdentifier() && Name.getAsIdentifierInfo()->isStr("main") && + NewVD->getDeclContext()->getRedeclContext()->isTranslationUnit() && + !getLangOpts().Freestanding && !NewVD->getDescribedVarTemplate()) { + + // C++ [basic.start.main]p3 + // A program that declares a variable main at global scope is ill-formed. + if (getLangOpts().CPlusPlus) + Diag(D.getLocStart(), diag::err_main_global_variable); + + // In C, and external-linkage variable named main results in undefined + // behavior. + else if (NewVD->hasExternalFormalLinkage()) + Diag(D.getLocStart(), diag::warn_main_redefined); + } + if (D.isRedeclaration() && !Previous.empty()) { checkDLLAttributeRedeclaration( *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewVD, |
