[Bug libstdc++/47145] [4.6 Regression] cross-compilation fails with "cannot check for file existence when cross compiling"

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47145

--- Comment #3 from Kai Tietz <ktietz at gcc dot gnu.org> 2011-01-03 14:18:45 UTC ---
The issue here is AC_CHECK_FILE, which is documented to not work for
cross-compiling scenario. By replacing this to test -f, it should working for
native and cross-compile.
The following patch should solve this. I can't regenerate at the moment the
configure for testing. I'll do it later this eveing at home. But maybe someone
else could check it before.

Index: configure.ac
===================================================================
--- configure.ac        (revision 168422)
+++ configure.ac        (working copy)
@@ -343,9 +343,12 @@
 # Check for docbook
 AC_CHECK_PROG([XSLTPROC], xsltproc, yes, no)
 AC_CHECK_PROG([XMLLINT], xmllint, yes, no)
-AC_CHECK_FILE([/usr/share/sgml/docbook/xsl-ns-stylesheets/VERSION],
-             [glibcxx_stylesheets=yes], [glibcxx_stylesheets=no])

+glibcxx_stylesheets=no;
+if test -f /usr/share/sgml/docbook/xsl-ns-stylesheets/VERSION; then
+  glibcxx_stylesheets=yes;
+fi
+
 # Check for xml/html dependencies.
 AM_CONDITIONAL(BUILD_XML,
               test $ac_cv_prog_DOXYGEN = "yes" &&