| # getrandom.m4 serial 8 |
| dnl Copyright 2020-2021 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl Written by Paul Eggert. |
| |
| AC_DEFUN([gl_FUNC_GETRANDOM], |
| [ |
| AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS]) |
| AC_CHECK_FUNCS_ONCE([getrandom]) |
| if test "$ac_cv_func_getrandom" != yes; then |
| HAVE_GETRANDOM=0 |
| else |
| dnl On Solaris 11.4 the return type is 'int', not 'ssize_t'. |
| AC_CACHE_CHECK([whether getrandom is compatible with its GNU+BSD signature], |
| [gl_cv_func_getrandom_ok], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[/* Additional includes are needed before <sys/random.h> on uClibc |
| and Mac OS X. */ |
| #include <sys/types.h> |
| #include <stdlib.h> |
| #include <sys/random.h> |
| ssize_t getrandom (void *, size_t, unsigned int); |
| ]], |
| [[]]) |
| ], |
| [gl_cv_func_getrandom_ok=yes], |
| [gl_cv_func_getrandom_ok=no]) |
| ]) |
| if test $gl_cv_func_getrandom_ok = no; then |
| REPLACE_GETRANDOM=1 |
| fi |
| fi |
| |
| case "$host_os" in |
| mingw*) |
| AC_CHECK_HEADERS([bcrypt.h], [], [], |
| [[#include <windows.h> |
| ]]) |
| AC_CACHE_CHECK([whether the bcrypt library is guaranteed to be present], |
| [gl_cv_lib_assume_bcrypt], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#include <windows.h>]], |
| [[#if !(_WIN32_WINNT >= _WIN32_WINNT_WIN7) |
| cannot assume it |
| #endif |
| ]]) |
| ], |
| [gl_cv_lib_assume_bcrypt=yes], |
| [gl_cv_lib_assume_bcrypt=no]) |
| ]) |
| if test $gl_cv_lib_assume_bcrypt = yes; then |
| AC_DEFINE([HAVE_LIB_BCRYPT], [1], |
| [Define to 1 if the bcrypt library is guaranteed to be present.]) |
| LIB_GETRANDOM='-lbcrypt' |
| else |
| LIB_GETRANDOM='-ladvapi32' |
| fi |
| ;; |
| *) |
| LIB_GETRANDOM= ;; |
| esac |
| AC_SUBST([LIB_GETRANDOM]) |
| ]) |
