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.

1 files changed, 10 insertions, 2 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