[PATCH, v3] Potential solution to librt issue.

[Chris Fairles]

Uses AC_SEARCH_LIB to check if clock_gettime is in -lrt or -lposix4
(the latter for some Solaris archs). If its available, "-lrt" is
assigned to GLIBCXX_LIBS which is AC_SUBST'd so its available in
Makefile.am's as $(GLIBCXX_LIBS). I've just tacked it onto the LDFLAGS
for libstdc++.so/a. There might be a more appropriate var to tack it
onto (ldadd??).

There's at least one issue: if clock_gettime is a builtin (i.e.
doesn't require an external lib) then GLIBCXX_LIBS will hold the
string "none required" which will obviously cause failures during
linking. I'm not handling this in the patch because I'm not sure if
its even possible for an arch to have a builtin clock_gettime but it
can be added.

Chris
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: librt_patch.txt
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20080723/3bb98822/attachment.txt>