CMake: detect the presence of entropy functions

1 files changed, 21 insertions, 0 deletions

diff --git a/expat/ConfigureChecks.cmake b/expat/ConfigureChecks.cmake
index 6e440ca0..7d44ec1a 100644
--- a/expat/ConfigureChecks.cmake
+++ b/expat/ConfigureChecks.cmake
@@ -1,4 +1,5 @@
 include(CheckCCompilerFlag)

+include(CheckCSourceCompiles)

 include(CheckIncludeFile)

 include(CheckIncludeFiles)

 include(CheckFunctionExists)

@@ -21,6 +22,16 @@ check_function_exists("getpagesize" HAVE_GETPAGESIZE)
 check_function_exists("bcopy" HAVE_BCOPY)

 check_symbol_exists("memmove" "string.h" HAVE_MEMMOVE)

 check_function_exists("mmap" HAVE_MMAP)

+check_function_exists("getrandom" HAVE_GETRANDOM)

+

+if(USE_libbsd)

+    set(CMAKE_REQUIRED_LIBRARIES "bsd")

+endif()

+check_function_exists("arc4random_buf" HAVE_ARC4RANDOM_BUF)

+if(NOT HAVE_ARC4RANDOM_BUF)

+    check_function_exists("arc4random" HAVE_ARC4RANDOM)

+endif()

+set(CMAKE_REQUIRED_LIBRARIES)

 

 #/* Define to 1 if you have the ANSI C header files. */

 check_include_files("stdlib.h;stdarg.h;string.h;float.h" STDC_HEADERS)

@@ -41,6 +52,16 @@ else(HAVE_SYS_TYPES_H)
     set(SIZE_T "unsigned")

 endif(HAVE_SYS_TYPES_H)

 

+check_c_source_compiles("

+        #include <stdlib.h>  /* for NULL */

+        #include <unistd.h>  /* for syscall */

+        #include <sys/syscall.h>  /* for SYS_getrandom */

+        int main() {

+            syscall(SYS_getrandom, NULL, 0, 0);

+            return 0;

+        }"

+    HAVE_SYSCALL_GETRANDOM)

+

 configure_file(expat_config.h.cmake "${CMAKE_CURRENT_BINARY_DIR}/expat_config.h")

 add_definitions(-DHAVE_EXPAT_CONFIG_H)