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cmake: do not use -fPIC for MSYS2

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The MSYS2 build system automatically compiles all code with position-independent
code. When we manually add the -fPIC flag to the compiler flags, MSYS2 will
loudly complain about PIC being the default and thus not required.

Fix the annoyance by stripping -fPIC in MSYS2 enviroments like it is already
done for MinGW.
This commit is contained in:
Patrick Steinhardt 2016-06-20 11:09:49 +02:00
parent bb0edf87ce
commit b6a2fd0e0d
1 changed files with 8 additions and 6 deletions
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14
CMakeLists.txt
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@ -473,19 +473,21 @@ ELSE ()
SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_DEBUG")
ENDIF ()
IF (MINGW) # MinGW always does PIC and complains if we tell it to
IF (MINGW OR MSYS) # MinGW and MSYS always do PIC and complain if we tell them to
STRING(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
# MinGW >= 3.14 uses the C99-style stdio functions
# automatically, but forks like mingw-w64 still want
# us to define this in order to use them
ADD_DEFINITIONS(-D__USE_MINGW_ANSI_STDIO=1)
ELSEIF (BUILD_SHARED_LIBS)
ADD_C_FLAG_IF_SUPPORTED(-fvisibility=hidden)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
ENDIF ()
IF (MINGW)
# MinGW >= 3.14 uses the C99-style stdio functions
# automatically, but forks like mingw-w64 still want
# us to define this in order to use them
ADD_DEFINITIONS(-D__USE_MINGW_ANSI_STDIO=1)
ENDIF ()
ADD_C_FLAG_IF_SUPPORTED(-Wdocumentation)
ADD_C_FLAG_IF_SUPPORTED(-Wno-missing-field-initializers)
ADD_C_FLAG_IF_SUPPORTED(-Wstrict-aliasing=2)