cmake: Add confiure checks for pthread members

Author: cryptomilk

ConfigureChecks.cmake

@@ -2,6 +2,7 @@ include(CheckCSourceCompiles)
 include(TestBigEndian)
 include(CheckIncludeFile)
 include(CheckSymbolExists)
+include(CheckStructHasMember)
 
 check_include_file(cpuid.h HAVE_CPUID_H)
 
@@ -40,6 +41,27 @@ set(CMAKE_REQUIRED_LIBRARIES)
 set(CMAKE_REQUIRED_INCLUDES)
 endif()
 
+#
+# Check for pthread struct members
+#
+set(CMAKE_REQUIRED_FLAGS ${THREADS_PREFER_PTHREAD_FLAG})
+set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
+
+check_struct_has_member("struct __pthread_rwlock_arch_t"
+                        "__readers"
+                        "pthread.h"
+                        HAVE_THREAD_RWLOCK_ARCH_T_READERS
+                        LANGUAGE C)
+
+check_struct_has_member("struct __pthread_rwlock_arch_t"
+                        "__nr_readers"
+                        "pthread.h"
+                        HAVE_THREAD_RWLOCK_ARCH_T_NR_READERS
+                        LANGUAGE C)
+
+unset(CMAKE_REQUIRED_FLAGS)
+unset(CMAKE_REQUIRED_LIBRARIES)
+
 set(CMAKE_REQUIRED_INCLUDES ${CMAKE_CURRENT_SOURCE_DIR})
 
 check_c_source_compiles("#include <stdio.h>

src/config.cmake.h

@@ -71,6 +71,10 @@ static const char *dt_supported_extensions[] __attribute__((unused)) = {"@DT_SUP
 
 #cmakedefine HAVE_OMP_FIRSTPRIVATE_WITH_CONST 1
 
+#cmakedefine HAVE_THREAD_RWLOCK_ARCH_T_READERS 1
+
+#cmakedefine HAVE_THREAD_RWLOCK_ARCH_T_NR_READERS 1
+
 /******************************************************************************
  * OpenCL target settings
  *****************************************************************************/