build: Support SYSROOT based config script finding.

* src/libgcrypt.m4: Add support for SYSROOT and set
gpg_config_script_warn.  Use AC_PATH_PROG instead of AC_PATH_TOOL
because the config script is not expected to be installed with a
prefix for its name
* configure.ac: Print a library mismatch warning.
* m4/gpg-error.m4: Update from git master.
--

Also fixed the false copyright notice in libgcrypt.m4.

4 files changed, 73 insertions, 25 deletions

diff --git a/configure.ac b/configure.ac
index c5952c7d..baed3ecc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2123,9 +2123,17 @@ GCRY_MSG_SHOW([Try using Intel AVX2:     ],[$avx2support])
 GCRY_MSG_SHOW([Try using ARM NEON:       ],[$neonsupport])
 GCRY_MSG_SHOW([],[])
 
-if test "$print_egd_notice" = "yes"; then
+if test "x${gpg_config_script_warn}" != x; then
 cat <<G10EOF
+        Mismatches between the target platform and the to
+        be used libraries have been been detected for:
+         ${gpg_config_script_warn}
+        Please check above for warning messages.
 
+G10EOF
+fi
+if test "$print_egd_notice" = "yes"; then
+cat <<G10EOF
    The performance of the Unix random gatherer module (rndunix) is not
    very good and it does not keep the entropy pool over multiple
    invocations of Libgcrypt base applications.  The suggested way to
@@ -2145,7 +2153,6 @@ fi
 
 if test "$gcry_cv_gcc_attribute_aligned" != "yes" ; then
 cat <<G10EOF
-
    Please not that your compiler does not support the GCC style
    aligned attribute. Using this software may evoke bus errors.
 
@@ -2157,4 +2164,5 @@ if test -n "$gpl"; then
   echo "  $gpl"
   echo "included.  These parts are licensed under the GPL and thus the"
   echo "use of this library has to comply with the conditions of the GPL."
+  echo ""
 fi
diff --git a/doc/gcrypt.texi b/doc/gcrypt.texi
index 23efc526..ecd4d7fe 100644
--- a/doc/gcrypt.texi
+++ b/doc/gcrypt.texi
@@ -1797,7 +1797,7 @@ all the data.
 can either work in place or with two buffers.  It uses the cipher
 context already setup and described by the handle @var{h}.  There are 2
 ways to use the function: If @var{in} is passed as @code{NULL} and
-@var{inlen} is @code{0}, in-place encryption of the data in @var{out} or
+@var{inlen} is @code{0}, in-place encryption of the data in @var{out} of
 length @var{outsize} takes place.  With @var{in} being not @code{NULL},
 @var{inlen} bytes are encrypted to the buffer @var{out} which must have
 at least a size of @var{inlen}.  @var{outsize} must be set to the
diff --git a/m4/gpg-error.m4 b/m4/gpg-error.m4
index 053eceb8..1661204c 100644
--- a/m4/gpg-error.m4
+++ b/m4/gpg-error.m4
@@ -9,7 +9,7 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 #
-# Last-changed: 2014-01-24
+# Last-changed: 2014-10-02
 
 
 dnl AM_PATH_GPG_ERROR([MINIMUM-VERSION,
@@ -17,7 +17,12 @@ dnl                   [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
 dnl
 dnl Test for libgpg-error and define GPG_ERROR_CFLAGS, GPG_ERROR_LIBS,
 dnl GPG_ERROR_MT_CFLAGS, and GPG_ERROR_MT_LIBS.  The _MT_ variants are
-dnl used for programs requireding real multi thread support.
+dnl used for programs requireing real multi thread support.
+dnl
+dnl If a prefix option is not used, the config script is first
+dnl searched in $SYSROOT/bin and then along $PATH.  If the used
+dnl config script does not match the host specification the script
+dnl is added to the gpg_config_script_warn variable.
 dnl
 AC_DEFUN([AM_PATH_GPG_ERROR],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
@@ -36,13 +41,26 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   AC_ARG_WITH(gpg-error-prefix,,
               [gpg_error_config_prefix="$withval"])
 
-  if test x$gpg_error_config_prefix != x ; then
-     if test x${GPG_ERROR_CONFIG+set} != xset ; then
-        GPG_ERROR_CONFIG=$gpg_error_config_prefix/bin/gpg-error-config
+  if test x"${GPG_ERROR_CONFIG}" = x ; then
+     if test x"${gpg_error_config_prefix}" != x ; then
+        GPG_ERROR_CONFIG="${gpg_error_config_prefix}/bin/gpg-error-config"
+     else
+       case "${SYSROOT}" in
+         /*)
+           if test -x "${SYSROOT}/bin/gpg-error-config" ; then
+             GPG_ERROR_CONFIG="${SYSROOT}/bin/gpg-error-config"
+           fi
+           ;;
+         '')
+           ;;
+          *)
+           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
+           ;;
+       esac
      fi
   fi
 
-  AC_PATH_TOOL(GPG_ERROR_CONFIG, gpg-error-config, no)
+  AC_PATH_PROG(GPG_ERROR_CONFIG, gpg-error-config, no)
   min_gpg_error_version=ifelse([$1], ,0.0,$1)
   AC_MSG_CHECKING(for GPG Error - version >= $min_gpg_error_version)
   ok=no
@@ -83,8 +101,9 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
 *** built for $gpg_error_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-gpg-error-prefix
-*** to specify a matching config script.
+*** to specify a matching config script or use \$SYSROOT.
 ***]])
+        gpg_config_script_warn="$gpg_config_script_warn libgpg-error"
       fi
     fi
   else
diff --git a/src/libgcrypt.m4 b/src/libgcrypt.m4
index 6cf482fc..c67cfece 100644
--- a/src/libgcrypt.m4
+++ b/src/libgcrypt.m4
@@ -1,13 +1,15 @@
-dnl Autoconf macros for libgcrypt
-dnl       Copyright (C) 2002, 2004, 2011 Free Software Foundation, Inc.
-dnl
-dnl This file is free software; as a special exception the author gives
-dnl unlimited permission to copy and/or distribute it, with or without
-dnl modifications, as long as this notice is preserved.
-dnl
-dnl This file is distributed in the hope that it will be useful, but
-dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
-dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# libgcrypt.m4 - Autoconf macros to detect libgcrypt
+# Copyright (C) 2002, 2003, 2004, 2011, 2014 g10 Code GmbH
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This file is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Last-changed: 2014-10-02
 
 
 dnl AM_PATH_LIBGCRYPT([MINIMUM-VERSION,
@@ -20,19 +22,37 @@ dnl version of libgcrypt is at least 1.2.5 *and* the API number is 1.  Using
 dnl this features allows to prevent build against newer versions of libgcrypt
 dnl with a changed API.
 dnl
+dnl If a prefix option is not used, the config script is first
+dnl searched in $SYSROOT/bin and then along $PATH.  If the used
+dnl config script does not match the host specification the script
+dnl is added to the gpg_config_script_warn variable.
+dnl
 AC_DEFUN([AM_PATH_LIBGCRYPT],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
   AC_ARG_WITH(libgcrypt-prefix,
             AC_HELP_STRING([--with-libgcrypt-prefix=PFX],
                            [prefix where LIBGCRYPT is installed (optional)]),
      libgcrypt_config_prefix="$withval", libgcrypt_config_prefix="")
-  if test x$libgcrypt_config_prefix != x ; then
-     if test x${LIBGCRYPT_CONFIG+set} != xset ; then
-        LIBGCRYPT_CONFIG=$libgcrypt_config_prefix/bin/libgcrypt-config
+  if test x"${LIBGCRYPT_CONFIG}" = x ; then
+     if test x"${libgcrypt_config_prefix}" != x ; then
+        LIBGCRYPT_CONFIG="${libgcrypt_config_prefix}/bin/libgcrypt-config"
+     else
+       case "${SYSROOT}" in
+         /*)
+           if test -x "${SYSROOT}/bin/libgcrypt-config" ; then
+             LIBGCRYPT_CONFIG="${SYSROOT}/bin/libgcrypt-config"
+           fi
+           ;;
+         '')
+           ;;
+          *)
+           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
+           ;;
+       esac
      fi
   fi
 
-  AC_PATH_TOOL(LIBGCRYPT_CONFIG, libgcrypt-config, no)
+  AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)
   tmp=ifelse([$1], ,1:1.2.0,$1)
   if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then
      req_libgcrypt_api=`echo "$tmp"     | sed 's/\(.*\):\(.*\)/\1/'`
@@ -108,8 +128,9 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
 *** built for $libgcrypt_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-libgcrypt-prefix
-*** to specify a matching config script.
+*** to specify a matching config script or use \$SYSROOT.
 ***]])
+        gpg_config_script_warn="$gpg_config_script_warn libgcrypt"
       fi
     fi
   else