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[ppp.git] / m4 / ax_check_openssl_func.m4

diff --git a/m4/ax_check_openssl_func.m4 b/m4/ax_check_openssl_func.m4
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+++ b/m4/ax_check_openssl_func.m4
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+# SYNOPSIS
+#
+#   AX_CHECK_OPENSSL_DEFINE([DEFINE], [VAR][, action-if-found[, action-if-not-found]])
+#
+# DESCRIPTION
+#
+#   Check if OpenSSL has a define set in it's features provided, i.e. OPENSSL_NO_MD4.
+#   If so, the var argument ac_cv_openssl_[VAR] is set to yes, and action-is-found is
+#   run, else action-if-not-found is executed.
+#
+#   This module require AX_CHECK_OPENSSL
+#
+# LICENSE
+#
+#   Copyright (c) 2021 Eivind Naess <eivnaes@yahoo.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 1
+
+AC_DEFUN([AX_CHECK_OPENSSL_DEFINE], [
+    AC_REQUIRE([AX_CHECK_OPENSSL])
+    AC_MSG_CHECKING([for $2 support in openssl])
+    save_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
+    AC_PREPROC_IFELSE([
+        AC_LANG_PROGRAM(
+            [[@%:@include <openssl/opensslconf.h>]],
+            [[#ifdef $1
+              #error "No support for $1"
+              #endif]])],
+        AC_MSG_RESULT([yes])
+        [ac_cv_openssl_$2=yes]
+        $3,
+        AC_MSG_RESULT([no])
+        [ac_cv_openssl_$2=no]
+        $4
+    )
+    CPPFLAGS="$save_CPPFLAGS"
+])
+