diff options
| -rw-r--r-- | clang/lib/Sema/SemaDecl.cpp | 7 | ||||
| -rw-r--r-- | clang/test/Sema/vla.c | 5 |
2 files changed, 12 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp index 1ed063ab400..077658c624d 100644 --- a/clang/lib/Sema/SemaDecl.cpp +++ b/clang/lib/Sema/SemaDecl.cpp @@ -2344,6 +2344,13 @@ void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, if (NewFD->isInvalidDecl()) return; + if (NewFD->getResultType()->isVariablyModifiedType()) { + // Functions returning a variably modified type violate C99 6.7.5.2p2 + // because all functions have linkage. + Diag(NewFD->getLocation(), diag::err_vm_func_decl); + return NewFD->setInvalidDecl(); + } + // Semantic checking for this function declaration (in isolation). if (getLangOptions().CPlusPlus) { // C++-specific checks. diff --git a/clang/test/Sema/vla.c b/clang/test/Sema/vla.c index b4839143bf7..674547297a2 100644 --- a/clang/test/Sema/vla.c +++ b/clang/test/Sema/vla.c @@ -46,3 +46,8 @@ static const unsigned array[((2 * (int)((((4) / 2) + 1.0/3.0) * (4) - 1e-8)) + 1 int a[*]; // expected-error {{star modifier used outside of function prototype}} int f4(int a[*][*]); + +// PR2044 +int pr2044(int b) {int (*c(void))[b];**c() = 2;} // expected-error {{variably modified type}} +int pr2044b; +int (*pr2044c(void))[pr2044b]; // expected-error {{variably modified type}} |
