diff options
Diffstat (limited to 'm4/ax_check_openssl.m4')
| -rw-r--r-- | m4/ax_check_openssl.m4 | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/m4/ax_check_openssl.m4 b/m4/ax_check_openssl.m4 new file mode 100644 index 0000000..95703ed --- /dev/null +++ b/m4/ax_check_openssl.m4 @@ -0,0 +1,126 @@ +# 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 +# OPENSSL_LDFLAGS to the -L or -R flags 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 11 + +AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL]) +AC_DEFUN([AX_CHECK_OPENSSL], [ + found=false + AC_ARG_WITH([openssl], + [AS_HELP_STRING([--with-openssl=DIR], + [root of the OpenSSL directory])], + [ + case "$withval" in + "" | y | ye | yes | n | no) + AC_MSG_ERROR([Invalid --with-openssl value]) + ;; + *) ssldirs="$withval" + ;; + esac + ], [ + # if pkg-config is installed and openssl has installed a .pc file, + # then use that information and don't search ssldirs + AC_CHECK_TOOL([PKG_CONFIG], [pkg-config]) + if test x"$PKG_CONFIG" != x""; then + OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null` + if test $? = 0; then + OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null` + OPENSSL_CFLAGS=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null` + found=true + fi + fi + + # no such luck; use some default ssldirs + if ! $found; then + ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr" + fi + ] + ) + + + # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in + # an 'openssl' subdirectory + + if ! $found; then + OPENSSL_CFLAGS= + for ssldir in $ssldirs; do + AC_MSG_CHECKING([for include/openssl/ssl.h in $ssldir]) + if test -f "$ssldir/include/openssl/ssl.h"; then + OPENSSL_CFLAGS="-I$ssldir/include" + OPENSSL_LDFLAGS="-L$ssldir/lib" + OPENSSL_LIBS="-lssl -lcrypto" + found=true + AC_MSG_RESULT([yes]) + break + else + AC_MSG_RESULT([no]) + fi + done + + # if the file wasn't found, well, go ahead and try the link anyway -- maybe + # it will just work! + fi + + # 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]) + echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \ + "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_CFLAGS=$OPENSSL_CFLAGS" >&AS_MESSAGE_LOG_FD + + save_LIBS="$LIBS" + save_LDFLAGS="$LDFLAGS" + save_CPPFLAGS="$CPPFLAGS" + LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS" + LIBS="$OPENSSL_LIBS $LIBS" + CPPFLAGS="$OPENSSL_CFLAGS $CPPFLAGS" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])], + [ + AC_MSG_RESULT([yes]) + $1 + ], [ + AC_MSG_RESULT([no]) + $2 + ]) + CPPFLAGS="$save_CPPFLAGS" + LDFLAGS="$save_LDFLAGS" + LIBS="$save_LIBS" + + AC_SUBST([OPENSSL_CFLAGS]) + AC_SUBST([OPENSSL_LIBS]) + AC_SUBST([OPENSSL_LDFLAGS]) +]) |