Properly check for struct timespec

1 files changed, 8 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d4b4b626..cf6d7ca6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ INCLUDE(CheckSymbolExists)
 INCLUDE(CheckCCompilerFlag)
 INCLUDE(CheckCSourceCompiles)
 INCLUDE(CheckTypeSize)
+include(CheckStructHasMember)
 include(CheckFileOffsetBits)
 include(GNUInstallDirs)
 
@@ -178,6 +179,13 @@ IF(CMAKE_COMPILER_IS_GNUCC)
     SET(CMAKE_REQUIRED_FLAGS "${OLD_REQUIRED_FLAGS}")
 ENDIF()
 
+# Check if we have a proper timespec declaration
+CHECK_STRUCT_HAS_MEMBER("struct timespec" tv_sec time.h HAVE_STRUCT_TIMESPEC)
+IF(HAVE_STRUCT_TIMESPEC)
+    # Define it here so we don't have to include config.h for it
+    ADD_DEFINITIONS("-DHAVE_STRUCT_TIMESPEC")
+ENDIF()
+
 # Some systems may need libatomic for C11 atomic functions to work
 SET(OLD_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
 SET(CMAKE_REQUIRED_LIBRARIES ${OLD_REQUIRED_LIBRARIES} atomic)