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# SPDX-License-Identifier: FSFAP
#
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
#
# DESCRIPTION
#
# Look for OpenSSL in a number of default spots, or in a user-selected
# spot (via --with-openssl). Sets
#
# OPENSSL_CFLAGS to the include directives required
# OPENSSL_LIBS to the -l directives required
#
# and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
#
# This macro sets OPENSSL_CFLAGS such that source files should use the
# openssl/ directory in include directives:
#
# #include <openssl/hmac.h>
#
# LICENSE
#
# Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
# Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.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 10
AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
AC_DEFUN([AX_CHECK_OPENSSL], [
found=false
default_ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /opt/local /usr/local/opt/openssl /usr/local/opt/libressl /usr"
AC_ARG_WITH([openssl],
[AS_HELP_STRING([--with-openssl=DIR],
[root of the OpenSSL directory])],
[
AS_CASE([$with_openssl],
[""|y|ye|yes],[ssldirs="$default_ssldirs"],
[n|no],[AC_MSG_ERROR([Invalid --with-openssl value])],
[*],[ssldirs="$withval"],
[ssldirs="$default_ssldirs"]
)
], [
# if pkg-config is installed and openssl has installed a .pc file,
# then use that information and don't search ssldirs
PKG_CHECK_MODULES([OPENSSL], [crypto],
[found=true],
[ssldirs="$default_ssldirs"])
]
)
# note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
# an 'openssl' subdirectory
AS_IF([! $found],[
OPENSSL_CFLAGS=
for ssldir in $ssldirs; do
AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
AS_IF([test -f "$ssldir/include/openssl/ssl.h"],
[
OPENSSL_CFLAGS="-I$ssldir/include"
OPENSSL_LIBS="-L$ssldir/lib -lssl -lcrypto"
found=true
AC_MSG_RESULT([yes])
break
],
[
AC_MSG_RESULT([no])
])
done
# if the file wasn't found, well, go ahead and try the link anyway -- maybe
# it will just work!
])
# try the preprocessor and linker with our new flags,
# being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
# AC_MSG_NOTICE([Trying link with OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_CFLAGS=$OPENSSL_CFLAGS])
save_LIBS="$LIBS"
save_CPPFLAGS="$CPPFLAGS"
LIBS="$OPENSSL_LIBS $LIBS"
CPPFLAGS="$OPENSSL_CFLAGS $CPPFLAGS"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[
#include <openssl/crypto.h>
],
[
OPENSSL_free(NULL);
])],
[
AC_MSG_RESULT([yes])
$1
], [
AC_MSG_RESULT([no])
$2
])
CPPFLAGS="$save_CPPFLAGS"
LIBS="$save_LIBS"
AC_SUBST([OPENSSL_CFLAGS])
AC_SUBST([OPENSSL_LIBS])
])
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