Fix EHa flag compiler filtering (#5524)

The previous attempt to enable Structured Exception Handling in
(only) MSVC using the /EHa compiler flag caused trouble with flags
defined with Cmake Generator Expressions. These expressions are
not fully resolved, and they fail validation checks in
check_cxx_compiler_flag(). The previous attempt at applying
/EHa to only MVSC involved refactoring a direct call to
target_compile_options() with a call to the Slang helper function
add_supported_cxx_flags() where an additional MSVC filter was
introduced, but the helper also calls check_cxx_compiler_flag() to
see if flags are supported. It was okay for /EHa, but not some
other flags that ended up getting newly validated.

The above issue is fixed by re-implementing the change that added
/EHa to only MSVC. This change goes back to adding compiler flags
without the helper function with its extra validation, instead using
an additional cmake generator expression to apply /EHa only to MSVC.

0 files changed, 0 insertions, 0 deletions