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/m4/ax_check_openssl.m4

http://github.com/mozy/mordor
m4 | 124 lines | 70 code | 11 blank | 43 comment | 0 complexity | ba92b5670aec5ccb0021544586356f03 MD5 | raw file
  1# ===========================================================================
  2#     https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
  3# ===========================================================================
  4#
  5# SYNOPSIS
  6#
  7#   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
  8#
  9# DESCRIPTION
 10#
 11#   Look for OpenSSL in a number of default spots, or in a user-selected
 12#   spot (via --with-openssl).  Sets
 13#
 14#     OPENSSL_INCLUDES to the include directives required
 15#     OPENSSL_LIBS to the -l directives required
 16#     OPENSSL_LDFLAGS to the -L or -R flags required
 17#
 18#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
 19#
 20#   This macro sets OPENSSL_INCLUDES such that source files should use the
 21#   openssl/ directory in include directives:
 22#
 23#     #include <openssl/hmac.h>
 24#
 25# LICENSE
 26#
 27#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
 28#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
 29#
 30#   Copying and distribution of this file, with or without modification, are
 31#   permitted in any medium without royalty provided the copyright notice
 32#   and this notice are preserved. This file is offered as-is, without any
 33#   warranty.
 34
 35#serial 10
 36
 37AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
 38AC_DEFUN([AX_CHECK_OPENSSL], [
 39    found=false
 40    AC_ARG_WITH([openssl],
 41        [AS_HELP_STRING([--with-openssl=DIR],
 42            [root of the OpenSSL directory])],
 43        [
 44            case "$withval" in
 45            "" | y | ye | yes | n | no)
 46            AC_MSG_ERROR([Invalid --with-openssl value])
 47              ;;
 48            *) ssldirs="$withval"
 49              ;;
 50            esac
 51        ], [
 52            # if pkg-config is installed and openssl has installed a .pc file,
 53            # then use that information and don't search ssldirs
 54            AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
 55            if test x"$PKG_CONFIG" != x""; then
 56                OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
 57                if test $? = 0; then
 58                    OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
 59                    OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
 60                    found=true
 61                fi
 62            fi
 63
 64            # no such luck; use some default ssldirs
 65            if ! $found; then
 66                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
 67            fi
 68        ]
 69        )
 70
 71
 72    # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
 73    # an 'openssl' subdirectory
 74
 75    if ! $found; then
 76        OPENSSL_INCLUDES=
 77        for ssldir in $ssldirs; do
 78            AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
 79            if test -f "$ssldir/include/openssl/ssl.h"; then
 80                OPENSSL_INCLUDES="-I$ssldir/include"
 81                OPENSSL_LDFLAGS="-L$ssldir/lib"
 82                OPENSSL_LIBS="-lssl -lcrypto"
 83                found=true
 84                AC_MSG_RESULT([yes])
 85                break
 86            else
 87                AC_MSG_RESULT([no])
 88            fi
 89        done
 90
 91        # if the file wasn't found, well, go ahead and try the link anyway -- maybe
 92        # it will just work!
 93    fi
 94
 95    # try the preprocessor and linker with our new flags,
 96    # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
 97
 98    AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
 99    echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
100        "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD
101
102    save_LIBS="$LIBS"
103    save_LDFLAGS="$LDFLAGS"
104    save_CPPFLAGS="$CPPFLAGS"
105    LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
106    LIBS="$OPENSSL_LIBS $LIBS"
107    CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
108    AC_LINK_IFELSE(
109        [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
110        [
111            AC_MSG_RESULT([yes])
112            $1
113        ], [
114            AC_MSG_RESULT([no])
115            $2
116        ])
117    CPPFLAGS="$save_CPPFLAGS"
118    LDFLAGS="$save_LDFLAGS"
119    LIBS="$save_LIBS"
120
121    AC_SUBST([OPENSSL_INCLUDES])
122    AC_SUBST([OPENSSL_LIBS])
123    AC_SUBST([OPENSSL_LDFLAGS])
124])