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

[joseph at codesourcery dot com]

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

--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2011-01-03 16:11:45 UTC ---
On Mon, 3 Jan 2011, ktietz at gcc dot gnu.org wrote:

> 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.

There were also comments that the path is sometimes wrong.  Using test -f 
should fix the immediate regression - but it would be better not to 
hardcode paths at all.  Presumably the issue is that some particular 
stylesheets are needed *in the path searched by the tools being tested 
for*, which may depend on how those tools were configured and may not be 
in /usr at all.  So it would be better to have a feature test - run the 
tools (if found) on a suitable document to see if they can find the 
required stylesheets.  Perhaps the libstdc++ maintainers could comment on 
what the actual feature required is for which a path test is being used as 
a bad proxy?