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cmake: only enable supported compiler warning flags

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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.
This commit is contained in:
Patrick Steinhardt 2017-03-01 13:58:15 +01:00
parent a454641ee8
commit a02e8a3882
1 changed files with 4 additions and 1 deletions
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5
CMakeLists.txt
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@ -464,7 +464,10 @@ IF (MSVC)
# Precompiled headers
ELSE ()
SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra ${CMAKE_C_FLAGS}")
SET(CMAKE_C_FLAGS "-D_GNU_SOURCE ${CMAKE_C_FLAGS}")
ADD_C_FLAG_IF_SUPPORTED(-Wall)
ADD_C_FLAG_IF_SUPPORTED(-Wextra)
IF (CMAKE_SYSTEM_NAME MATCHES "(Solaris|SunOS)")
SET(CMAKE_C_FLAGS "-std=c99 -D_POSIX_C_SOURCE=200112L -D__EXTENSIONS__ -D_POSIX_PTHREAD_SEMANTICS ${CMAKE_C_FLAGS}")