1 # sys_random_h.m4 serial 8
2 dnl Copyright (C) 2020-2021 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN_ONCE([gl_SYS_RANDOM_H],
9 AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
10 dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
11 gl_CHECK_NEXT_HEADERS([sys/random.h])
12 if test $ac_cv_header_sys_random_h = yes; then
17 AC_SUBST([HAVE_SYS_RANDOM_H])
19 m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
20 if test $ac_cv_header_sys_random_h = yes; then
21 UNISTD_H_HAVE_SYS_RANDOM_H=1
24 dnl Check for declarations of anything we want to poison if the
25 dnl corresponding gnulib module is not in use.
26 gl_WARN_ON_USE_PREPARE([[
28 /* Additional includes are needed before <sys/random.h> on uClibc
30 # include <sys/types.h>
32 # include <sys/random.h>
38 # gl_SYS_RANDOM_MODULE_INDICATOR([modulename])
39 # sets the shell variable that indicates the presence of the given module
40 # to a C preprocessor expression that will evaluate to 1.
41 # This macro invocation must not occur in macros that are AC_REQUIREd.
42 AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
44 dnl Ensure to expand the default settings once only.
45 gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
46 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
47 dnl Define it also as a C macro, for the benefit of the unit tests.
48 gl_MODULE_INDICATOR_FOR_TESTS([$1])
51 # Initializes the default values for AC_SUBSTed shell variables.
52 # This macro must not be AC_REQUIREd. It must only be invoked, and only
53 # outside of macros or in macros that are not AC_REQUIREd.
54 AC_DEFUN([gl_SYS_RANDOM_H_REQUIRE_DEFAULTS],
56 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS], [
57 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETRANDOM])
59 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS])
60 AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
63 AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
65 dnl Assume proper GNU behavior unless another module says otherwise.
66 HAVE_GETRANDOM=1; AC_SUBST([HAVE_GETRANDOM])
67 REPLACE_GETRANDOM=0; AC_SUBST([REPLACE_GETRANDOM])