m4/ax_check_openssl.m4

   1 # ===========================================================================
   2 #     http://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 #     SSL_INCLUDES to the include directives required
  15 #     SSL_LIBS to the -l directives required
  16 #     SSL_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 SSL_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 8
  36
  37 AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
  38 AC_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_PATH_PROG([PKG_CONFIG], [pkg-config])
  55             if test x"$PKG_CONFIG" != x""; then
  56                 SSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
  57                 if test $? = 0; then
  58                     SSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
  59                     SSL_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         SSL_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                 SSL_INCLUDES="-I$ssldir/include"
  81                 SSL_LDFLAGS="-L$ssldir/lib"
  82                 SSL_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 SSL_LDFLAGS=$SSL_LDFLAGS;" \
 100         "SSL_LIBS=$SSL_LIBS; SSL_INCLUDES=$SSL_INCLUDES" >&AS_MESSAGE_LOG_FD
 101
 102     save_LIBS="$LIBS"
 103     save_LDFLAGS="$LDFLAGS"
 104     save_CPPFLAGS="$CPPFLAGS"
 105     LDFLAGS="$LDFLAGS $SSL_LDFLAGS"
 106     LIBS="$SSL_LIBS $LIBS"
 107     CPPFLAGS="$SSL_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([SSL_INCLUDES])
 122     AC_SUBST([SSL_LIBS])
 123     AC_SUBST([SSL_LDFLAGS])
 124 ])