1# Copyright (c) 2017 Facebook, Inc. 2# Licensed under the Apache License, Version 2.0 (the "License") 3 4if (ENABLE_NO_PIE) 5 6if (CMAKE_C_COMPILER_ID MATCHES "Clang") 7 set(COMPILER_NOPIE_FLAG "-nopie") 8else() 9 set(_backup_c_flags "${CMAKE_REQUIRED_FLAGS}") 10 set(CMAKE_REQUIRED_FLAGS "-no-pie") 11 CHECK_CXX_SOURCE_COMPILES("int main() {return 0;}" 12 HAVE_NO_PIE_FLAG) 13 if (HAVE_NO_PIE_FLAG) 14 set(COMPILER_NOPIE_FLAG "-no-pie") 15 else() 16 set(COMPILER_NOPIE_FLAG "") 17 endif() 18 set(CMAKE_REQUIRED_FLAGS "${_backup_c_flags}") 19endif() 20 21endif(ENABLE_NO_PIE) 22 23# check whether reallocarray availability 24# this is used to satisfy reallocarray usage under src/cc/libbpf/ 25CHECK_CXX_SOURCE_COMPILES( 26" 27#define _GNU_SOURCE 28#include <stdlib.h> 29 30int main(void) 31{ 32 return !!reallocarray(NULL, 1, 1); 33} 34" HAVE_REALLOCARRAY_SUPPORT) 35