Hi,
I noticed that a cross-compiler produces an unusable libstdc++.so
that contains an unresolved reference to aligned_alloc instead of
posix_memalign, or whatever is actually available.
Therefore it is impossible to link any C++ programs against the
libstdc++.so that comes with the cross-compiler.
That happens for instance in the following configuration:
--target=arm-linux-gnueabihf.
The attached patch adds a link test for the memalign function
and fixes the cross-build for me.
Is it OK for trunk?
Thanks
Bernd.
2016-11-30 Bernd Edlinger <bernd.edlin...@hotmail.de>
* crossconfig.m4 (*-linux*): Add link-check for memalign.
* configure: Regenerated.
Index: libstdc++-v3/configure
===================================================================
--- libstdc++-v3/configure (revision 242960)
+++ libstdc++-v3/configure (working copy)
@@ -59826,11 +59826,24 @@ _ACEOF
fi
done
+ for ac_func in aligned_alloc posix_memalign memalign _aligned_malloc
+do :
+ as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+eval as_val=\$$as_ac_var
+ if test "x$as_val" = x""yes; then :
+ cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+fi
+done
+
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for iconv" >&5
$as_echo_n "checking for iconv... " >&6; }
if test "${am_cv_func_iconv+set}" = set; then :
Index: libstdc++-v3/crossconfig.m4
===================================================================
--- libstdc++-v3/crossconfig.m4 (revision 242960)
+++ libstdc++-v3/crossconfig.m4 (working copy)
@@ -157,6 +157,7 @@ case "${host}" in
AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1)
GCC_CHECK_TLS
AC_CHECK_FUNCS(__cxa_thread_atexit_impl)
+ AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
AM_ICONV
;;
*-mingw32*)
