cmake: replace check_function_exists by check_cxx_symbol_exists

CMakeLists.txt

@@ -18,7 +18,6 @@ list (APPEND CMAKE_MODULE_PATH ${glog_SOURCE_DIR}/cmake)
 include (CheckCXXSourceCompiles)
 include (CheckCXXSourceRuns)
 include (CheckCXXSymbolExists)
-include (CheckFunctionExists)
 include (CheckIncludeFileCXX)
 include (CheckStructHasMember)
 include (CheckTypeSize)
@@ -141,12 +140,12 @@ check_include_file_cxx (unistd.h HAVE_UNISTD_H)
 check_type_size (mode_t HAVE_MODE_T LANGUAGE CXX)
 check_type_size (ssize_t HAVE_SSIZE_T LANGUAGE CXX)
 
-check_function_exists (dladdr HAVE_DLADDR)
-check_function_exists (fcntl HAVE_FCNTL)
-check_function_exists (pread HAVE_PREAD)
-check_function_exists (pwrite HAVE_PWRITE)
-check_function_exists (sigaction HAVE_SIGACTION)
-check_function_exists (sigaltstack HAVE_SIGALTSTACK)
+check_cxx_symbol_exists (dladdr dlfcn.h HAVE_DLADDR)
+check_cxx_symbol_exists (fcntl fcntl.h HAVE_FCNTL)
+check_cxx_symbol_exists (pread unistd.h HAVE_PREAD)
+check_cxx_symbol_exists (pwrite unistd.h HAVE_PWRITE)
+check_cxx_symbol_exists (sigaction csignal HAVE_SIGACTION)
+check_cxx_symbol_exists (sigaltstack csignal HAVE_SIGALTSTACK)
 
 check_cxx_symbol_exists (backtrace execinfo.h HAVE_EXECINFO_BACKTRACE)
 check_cxx_symbol_exists (backtrace_symbols execinfo.h