[Clang] -fno-exceptions not respected in combination with -fopenmp

[kalvdans]

I tried to compile

#include <stdexcept>

int f() {
    throw std::invalid_argument("hej");
}

with clang -O2 -fopenmp -fno-exceptions -c test.cpp and it works. If I remove the -fopenmp flag it correctly fails since we can't throw without exceptions being turned on.

Reproduced on godbolt with clang-19.1.0 and clang-20.1.0. Not reproducable with gcc 15.1.

[shafik]

Looks like it stated after clang-13: https://godbolt.org/z/vn87Yo59j

CC @AaronBallman

[AaronBallman]

Curiously, the driver is doing the correct thing: https://godbolt.org/z/he44Kra7x

CC @alexey-bataev

[AaronBallman]

Oof:

llvm-project/clang/lib/Sema/SemaStmt.cpp

Line 4414 in 2485c51

// Don't report an error if 'try' is used in system headers or in an OpenMP