Merge pull request #1746 from hector-cao/fix-preload-build-error

librdmacm/preload.c: fix duplicate symbol definitions on armhf

Author: rleon

CMakeLists.txt

@@ -467,9 +467,17 @@ int main(void) {
   return 0;
 }
 " RDMA_PRELOAD_LIBC_HAS_FCNTL64_SENDFILE64)
+CHECK_C_SOURCE_COMPILES("
+#include <fcntl.h>
+int fcntl(int, int, ...) { return 0; }
+int fcntl64(int, int, ...) { return 0; }
+int main(void) {
+  return 0;
+}
+" RDMA_PRELOAD_LIBC_SYMS_LFS_NOT_ALIAS)
 set(CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
 set(CMAKE_REQUIRED_QUIET 0)
-if(RDMA_PRELOAD_LIBC_HAS_FCNTL64_SENDFILE64)
+if(RDMA_PRELOAD_LIBC_HAS_FCNTL64_SENDFILE64 AND RDMA_PRELOAD_LIBC_SYMS_LFS_NOT_ALIAS)
   set(RDMA_PRELOAD_HAVE_LFS_WRAPPER_SYMS 1)
 else()
   set(RDMA_PRELOAD_HAVE_LFS_WRAPPER_SYMS 0)