tree f308d73472f4950bcd8e481c5a1f262925753140
parent a454641ee8b7b2ef1083b7f33d6135d87b50e9b0
author Patrick Steinhardt <ps@pks.im> 1488373095 +0100
committer Patrick Steinhardt <ps@pks.im> 1488373095 +0100

cmake: only enable supported compiler warning flags

We currently unconditionally enable the "-Wall" and "-Wextra" flags.
Some platforms rely on compilers which do not support these flags,
though. One of these platforms is Haiku, which does not support
"-Wextra" due to being stuck on GCC version 2.

Fix builds on such platforms by adding these flags only if supported by
the compiler.