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