Only set _POSIX_C_SOURCE if needed

1 files changed, 28 insertions, 18 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6442e67..f3651dcc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,7 +41,9 @@ OPTION(ALSOFT_HRTF_DEFS "Install HRTF definition files" ON)
 OPTION(ALSOFT_INSTALL "Install headers and libraries" ON)
 
 
-IF(WIN32)
+IF(NOT WIN32)
+    SET(LIBNAME openal)
+ELSE()
     SET(LIBNAME OpenAL32)
     ADD_DEFINITIONS("-D_WIN32 -D_WIN32_WINNT=0x0502")
 
@@ -60,22 +62,7 @@ IF(WIN32)
             ENDIF()
         ENDIF()
     ENDIF()
-ELSE()
-    SET(LIBNAME openal)
-
-    # These are needed on non-Windows systems for extra features
-    ADD_DEFINITIONS(-D_GNU_SOURCE=1 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700)
-    SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_GNU_SOURCE=1 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700")
-ENDIF()
-
-# Set defines for large file support
-CHECK_FILE_OFFSET_BITS()
-IF(_FILE_OFFSET_BITS)
-    ADD_DEFINITIONS(-D_FILE_OFFSET_BITS=${_FILE_OFFSET_BITS})
-    SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_FILE_OFFSET_BITS=${_FILE_OFFSET_BITS}")
 ENDIF()
-ADD_DEFINITIONS(-D_LARGEFILE_SOURCE -D_LARGE_FILES)
-SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_LARGEFILE_SOURCE -D_LARGE_FILES")
 
 
 # QNX's gcc do not uses /usr/include and /usr/lib pathes by default
@@ -111,6 +98,29 @@ ELSE()
     ENDIF()
 ENDIF()
 
+# Check if _POSIX_C_SOURCE needs to be set for POSIX functions
+CHECK_SYMBOL_EXISTS(posix_memalign stdlib.h HAVE_POSIX_MEMALIGN_DEFAULT)
+IF(NOT HAVE_POSIX_MEMALIGN_DEFAULT)
+    SET(OLD_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
+    SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_POSIX_C_SOURCE=200809L")
+    CHECK_SYMBOL_EXISTS(posix_memalign stdlib.h HAVE_POSIX_MEMALIGN_POSIX)
+    IF(NOT HAVE_POSIX_MEMALIGN_POSIX)
+        SET(CMAKE_REQUIRED_FLAGS ${OLD_REQUIRED_FLAGS})
+    ELSE()
+        ADD_DEFINITIONS(-D_POSIX_C_SOURCE=200809L)
+    ENDIF()
+    UNSET(OLD_REQUIRED_FLAGS)
+ENDIF()
+
+# Set defines for large file support
+CHECK_FILE_OFFSET_BITS()
+IF(_FILE_OFFSET_BITS)
+    ADD_DEFINITIONS(-D_FILE_OFFSET_BITS=${_FILE_OFFSET_BITS})
+    SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_FILE_OFFSET_BITS=${_FILE_OFFSET_BITS}")
+ENDIF()
+ADD_DEFINITIONS(-D_LARGEFILE_SOURCE -D_LARGE_FILES)
+SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -D_LARGEFILE_SOURCE -D_LARGE_FILES")
+
 # MSVC may need workarounds for C99 restrict and inline
 IF(MSVC)
     # TODO: Once we truly require C99, these restrict and inline checks should go
@@ -476,12 +486,12 @@ ENDIF()
 # Check if we have Windows headers
 CHECK_INCLUDE_FILE(windows.h HAVE_WINDOWS_H -D_WIN32_WINNT=0x0502)
 IF(NOT HAVE_WINDOWS_H)
-    CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
+    CHECK_SYMBOL_EXISTS(gettimeofday sys/time.h HAVE_GETTIMEOFDAY)
     IF(NOT HAVE_GETTIMEOFDAY)
         MESSAGE(FATAL_ERROR "No timing function found!")
     ENDIF()
 
-    CHECK_FUNCTION_EXISTS(nanosleep HAVE_NANOSLEEP)
+    CHECK_SYMBOL_EXISTS(nanosleep time.h HAVE_NANOSLEEP)
     IF(NOT HAVE_NANOSLEEP)
         MESSAGE(FATAL_ERROR "No sleep function found!")
     ENDIF()