1 files changed, 184 insertions, 0 deletions
diff --git a/cmake/modules/CephChecks.cmake b/cmake/modules/CephChecks.cmake
new file mode 100644
index 000000000..701ecb47c
--- /dev/null
+++ b/cmake/modules/CephChecks.cmake
@@ -0,0 +1,184 @@
+if(CMAKE_CXX_COMPILER_ID STREQUAL GNU)
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7)
+    message(FATAL_ERROR "GCC 7+ required due to C++17 requirements")
+  endif()
+endif()
+
+#Check Includes
+include(CheckIncludeFiles)
+include(CheckIncludeFileCXX)
+include(CheckFunctionExists)
+
+check_function_exists(fallocate CEPH_HAVE_FALLOCATE)
+check_function_exists(posix_fadvise HAVE_POSIX_FADVISE)
+check_function_exists(posix_fallocate HAVE_POSIX_FALLOCATE)
+check_function_exists(syncfs HAVE_SYS_SYNCFS)
+check_function_exists(sync_file_range HAVE_SYNC_FILE_RANGE)
+check_function_exists(pwritev HAVE_PWRITEV)
+check_function_exists(splice CEPH_HAVE_SPLICE)
+check_function_exists(getgrouplist HAVE_GETGROUPLIST)
+if(NOT APPLE)
+  check_function_exists(fdatasync HAVE_FDATASYNC)
+endif()
+check_function_exists(strerror_r HAVE_Strerror_R)
+check_function_exists(name_to_handle_at HAVE_NAME_TO_HANDLE_AT)
+check_function_exists(pipe2 HAVE_PIPE2)
+check_function_exists(accept4 HAVE_ACCEPT4)
+check_function_exists(sigdescr_np HAVE_SIGDESCR_NP)
+
+include(CMakePushCheckState)
+cmake_push_check_state(RESET)
+set(CMAKE_REQUIRED_LIBRARIES pthread)
+check_function_exists(pthread_spin_init HAVE_PTHREAD_SPINLOCK)
+check_function_exists(pthread_set_name_np HAVE_PTHREAD_SET_NAME_NP)
+check_function_exists(pthread_get_name_np HAVE_PTHREAD_GET_NAME_NP)
+check_function_exists(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
+check_function_exists(pthread_getname_np HAVE_PTHREAD_GETNAME_NP)
+check_function_exists(pthread_rwlockattr_setkind_np HAVE_PTHREAD_RWLOCKATTR_SETKIND_NP)
+cmake_pop_check_state()
+
+check_function_exists(eventfd HAVE_EVENTFD)
+check_function_exists(getprogname HAVE_GETPROGNAME)
+check_function_exists(gettid HAVE_GETTID)
+
+CHECK_INCLUDE_FILES("linux/types.h" HAVE_LINUX_TYPES_H)
+CHECK_INCLUDE_FILES("linux/version.h" HAVE_LINUX_VERSION_H)
+CHECK_INCLUDE_FILES("arpa/nameser_compat.h" HAVE_ARPA_NAMESER_COMPAT_H)
+CHECK_INCLUDE_FILES("sys/mount.h" HAVE_SYS_MOUNT_H)
+CHECK_INCLUDE_FILES("sys/param.h" HAVE_SYS_PARAM_H)
+CHECK_INCLUDE_FILES("sys/types.h" HAVE_SYS_TYPES_H)
+CHECK_INCLUDE_FILES("sys/vfs.h" HAVE_SYS_VFS_H)
+CHECK_INCLUDE_FILES("sys/prctl.h" HAVE_SYS_PRCTL_H)
+CHECK_INCLUDE_FILES("execinfo.h" HAVE_EXECINFO_H)
+if(LINUX)
+  CHECK_INCLUDE_FILES("sched.h" HAVE_SCHED)
+endif()
+CHECK_INCLUDE_FILES("valgrind/helgrind.h" HAVE_VALGRIND_HELGRIND_H)
+
+include(CheckTypeSize)
+set(CMAKE_EXTRA_INCLUDE_FILES "linux/types.h" "netinet/in.h")
+CHECK_TYPE_SIZE(__u8 __U8) 
+CHECK_TYPE_SIZE(__u16 __U16) 
+CHECK_TYPE_SIZE(__u32 __U32) 
+CHECK_TYPE_SIZE(__u64 __U64) 
+CHECK_TYPE_SIZE(__s8 __S8) 
+CHECK_TYPE_SIZE(__s16 __S16) 
+CHECK_TYPE_SIZE(__s32 __S32) 
+CHECK_TYPE_SIZE(__s64 __S64) 
+CHECK_TYPE_SIZE(in_addr_t IN_ADDR_T)
+unset(CMAKE_EXTRA_INCLUDE_FILES)
+
+include(CheckSymbolExists)
+cmake_push_check_state(RESET)
+set(CMAKE_REQUIRED_LIBRARIES rt)
+check_symbol_exists(_POSIX_TIMERS "unistd.h;time.h" HAVE_POSIX_TIMERS)
+cmake_pop_check_state()
+if(HAVE_POSIX_TIMERS)
+  find_library(RT_LIBRARY NAMES rt)
+endif()
+check_symbol_exists(res_nquery "resolv.h" HAVE_RES_NQUERY)
+check_symbol_exists(F_SETPIPE_SZ "linux/fcntl.h" CEPH_HAVE_SETPIPE_SZ)
+check_symbol_exists(__func__ "" HAVE_FUNC)
+check_symbol_exists(__PRETTY_FUNCTION__ "" HAVE_PRETTY_FUNC)
+check_symbol_exists(getentropy "unistd.h" HAVE_GETENTROPY)
+
+include(CheckCXXSourceCompiles)
+check_cxx_source_compiles("
+  #include <string.h>
+  int main() { char x = *strerror_r(0, &x, sizeof(x)); return 0; }
+  " STRERROR_R_CHAR_P)
+
+include(CheckStructHasMember)
+CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtim.tv_nsec sys/stat.h
+  HAVE_STAT_ST_MTIM_TV_NSEC LANGUAGE C)
+CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtimespec.tv_nsec sys/stat.h
+  HAVE_STAT_ST_MTIMESPEC_TV_NSEC LANGUAGE C)
+
+if(NOT CMAKE_CROSSCOMPILING)
+  include(CheckCXXSourceRuns)
+  cmake_push_check_state()
+  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++17")
+  if(WIN32)
+    set(CMAKE_REQUIRED_LIBRARIES ws2_32)
+  endif()
+
+  check_cxx_source_runs("
+#include <cstdint>
+#include <iterator>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+uint32_t load(char* p, size_t offset)
+{
+  return *reinterpret_cast<uint32_t*>(p + offset);
+}
+
+bool good(uint32_t lhs, uint32_t big_endian)
+{
+  return lhs == ntohl(big_endian);
+}
+
+int main(int argc, char **argv)
+{
+  char a1[] = \"ABCDEFG\";
+  uint32_t a2[] = {0x41424344,
+                   0x42434445,
+                   0x43444546,
+                   0x44454647};
+  for (size_t i = 0; i < std::size(a2); i++) {
+    if (!good(load(a1, i), a2[i])) {
+      return 1;
+    }
+  }
+}"
+    HAVE_UNALIGNED_ACCESS)
+  cmake_pop_check_state()
+  if(NOT HAVE_UNALIGNED_ACCESS)
+    message(FATAL_ERROR "Unaligned access is required")
+  endif()
+else(NOT CMAKE_CROSSCOMPILING)
+  message(STATUS "Assuming unaligned access is supported")
+endif(NOT CMAKE_CROSSCOMPILING)
+
+set(version_script_source "v1 { }; v2 { } v1;")
+file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/version_script.txt "${version_script_source}")
+cmake_push_check_state(RESET)
+set(CMAKE_REQUIRED_FLAGS "-Werror -Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/version_script.txt")
+check_c_source_compiles("
+__attribute__((__symver__ (\"func@v1\"))) void func_v1() {};
+__attribute__((__symver__ (\"func@v2\"))) void func_v2() {};
+
+int main() {}"
+  HAVE_ATTR_SYMVER)
+  if(NOT HAVE_ATTR_SYMVER)
+    if(CMAKE_CXX_FLAGS MATCHES "-flto" AND NOT CMAKE_CXX_FLAGS MATCHES "-flto-partition=none")
+      # https://tracker.ceph.com/issues/40060
+      message(FATAL_ERROR "please pass -flto-partition=none as part of CXXFLAGS")
+    endif()
+  endif()
+set(CMAKE_REQUIRED_FLAGS -Wl,--version-script=${CMAKE_CURRENT_BINARY_DIR}/version_script.txt)
+check_c_source_compiles("
+void func_v1() {}
+__asm__(\".symver func_v1, func@v1\");
+void func_v2() {}
+__asm__(\".symver func_v2, func@v2\");
+
+int main() {}"
+  HAVE_ASM_SYMVER)
+file(REMOVE ${CMAKE_CURRENT_BINARY_DIR}/version_script.txt)
+cmake_pop_check_state()
+
+# should use LINK_OPTIONS instead of LINK_LIBRARIES, if we can use cmake v3.14+
+try_compile(HAVE_LINK_VERSION_SCRIPT
+  ${CMAKE_CURRENT_BINARY_DIR}
+  SOURCES ${CMAKE_CURRENT_LIST_DIR}/CephCheck_link.c
+  LINK_LIBRARIES "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/CephCheck_link.map")
+
+try_compile(HAVE_LINK_EXCLUDE_LIBS
+  ${CMAKE_CURRENT_BINARY_DIR}
+  SOURCES ${CMAKE_CURRENT_LIST_DIR}/CephCheck_link.c
+  LINK_LIBRARIES "-Wl,--exclude-libs,ALL")