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Test for __cxa_thread_atexit_impl when cross-compiling libstdc++ for GNU targets


I noticed that when testing glibc with a cross compiler I got

UNSUPPORTED: nptl/tst-thread_local1

because the libstdc++-v3 configuration for cross compiling defaulted
to __cxa_thread_atexit_impl not being available.  This patch fixes
GLIBCXX_CROSSCONFIG to run the same test (for the case covering
targets with glibc) for __cxa_thread_atexit_impl as for native
compilation, just as it runs most of the other tests done for native
compilation (for these targets, it's not possible to build libstdc++
without already having built libc, so link tests are OK).

Tested with no regressions for cross to arm-none-linux-gnueabi.  OK to
commit?

2015-10-09  Joseph Myers  <joseph@codesourcery.com>

	* crossconfig.m4 (GLIBCXX_CROSSCONFIG) <*-linux* | *-uclinux* |
	*-gnu* | *-kfreebsd*-gnu | *-knetbsd*-gnu | *-cygwin*>: Check for
	__cxa_thread_atexit_impl.
	* configure: Regenerate.

Index: libstdc++-v3/crossconfig.m4
===================================================================
--- libstdc++-v3/crossconfig.m4	(revision 228601)
+++ libstdc++-v3/crossconfig.m4	(working copy)
@@ -156,6 +156,7 @@
     GLIBCXX_CHECK_STDLIB_SUPPORT
     AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1)
     GCC_CHECK_TLS
+    AC_CHECK_FUNCS(__cxa_thread_atexit_impl)
     AM_ICONV
     ;;
   *-mingw32*)

-- 
Joseph S. Myers
joseph@codesourcery.com


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