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-rw-r--r--m4/getrandom.m468
1 files changed, 68 insertions, 0 deletions
diff --git a/m4/getrandom.m4 b/m4/getrandom.m4
new file mode 100644
index 0000000..6ca7150
--- /dev/null
+++ b/m4/getrandom.m4
@@ -0,0 +1,68 @@
+# getrandom.m4 serial 8
+dnl Copyright 2020-2022 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])
+])