| 1 | # getrandom.m4 serial 8
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| 2 | dnl Copyright 2020-2022 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Written by Paul Eggert.
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| 8 |
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| 9 | AC_DEFUN([gl_FUNC_GETRANDOM],
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| 10 | [
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| 11 | AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
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| 12 | AC_CHECK_FUNCS_ONCE([getrandom])
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| 13 | if test "$ac_cv_func_getrandom" != yes; then
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| 14 | HAVE_GETRANDOM=0
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| 15 | else
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| 16 | dnl On Solaris 11.4 the return type is 'int', not 'ssize_t'.
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| 17 | AC_CACHE_CHECK([whether getrandom is compatible with its GNU+BSD signature],
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| 18 | [gl_cv_func_getrandom_ok],
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| 19 | [AC_COMPILE_IFELSE(
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| 20 | [AC_LANG_PROGRAM(
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| 21 | [[/* Additional includes are needed before <sys/random.h> on uClibc
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| 22 | and Mac OS X. */
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| 23 | #include <sys/types.h>
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| 24 | #include <stdlib.h>
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| 25 | #include <sys/random.h>
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| 26 | ssize_t getrandom (void *, size_t, unsigned int);
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| 27 | ]],
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| 28 | [[]])
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| 29 | ],
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| 30 | [gl_cv_func_getrandom_ok=yes],
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| 31 | [gl_cv_func_getrandom_ok=no])
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| 32 | ])
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| 33 | if test $gl_cv_func_getrandom_ok = no; then
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| 34 | REPLACE_GETRANDOM=1
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| 35 | fi
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| 36 | fi
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| 37 |
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| 38 | case "$host_os" in
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| 39 | mingw*)
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| 40 | AC_CHECK_HEADERS([bcrypt.h], [], [],
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| 41 | [[#include <windows.h>
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| 42 | ]])
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| 43 | AC_CACHE_CHECK([whether the bcrypt library is guaranteed to be present],
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| 44 | [gl_cv_lib_assume_bcrypt],
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| 45 | [AC_COMPILE_IFELSE(
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| 46 | [AC_LANG_PROGRAM(
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| 47 | [[#include <windows.h>]],
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| 48 | [[#if !(_WIN32_WINNT >= _WIN32_WINNT_WIN7)
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| 49 | cannot assume it
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| 50 | #endif
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| 51 | ]])
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| 52 | ],
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| 53 | [gl_cv_lib_assume_bcrypt=yes],
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| 54 | [gl_cv_lib_assume_bcrypt=no])
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| 55 | ])
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| 56 | if test $gl_cv_lib_assume_bcrypt = yes; then
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| 57 | AC_DEFINE([HAVE_LIB_BCRYPT], [1],
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| 58 | [Define to 1 if the bcrypt library is guaranteed to be present.])
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| 59 | LIB_GETRANDOM='-lbcrypt'
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| 60 | else
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| 61 | LIB_GETRANDOM='-ladvapi32'
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| 62 | fi
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| 63 | ;;
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| 64 | *)
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| 65 | LIB_GETRANDOM= ;;
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| 66 | esac
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| 67 | AC_SUBST([LIB_GETRANDOM])
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| 68 | ])
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