diff options
Diffstat (limited to 'newlib/configure.in')
| -rw-r--r-- | newlib/configure.in | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/newlib/configure.in b/newlib/configure.in index d666136a1..84e1f745a 100644 --- a/newlib/configure.in +++ b/newlib/configure.in @@ -354,6 +354,25 @@ if test $libc_cv_initfinit_array = yes; then AC_DEFINE_UNQUOTED(HAVE_INITFINI_ARRAY) fi +AC_CACHE_CHECK(for array aliasing support, + libc_cv_array_aliasing, [dnl +cat > conftest.c <<EOF +char x[3] = { 'a', 'b', 'c' }; +extern char y[2] __attribute__((alias ("x+1"))); +EOF +if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -c conftest.c + 1>&AS_MESSAGE_LOG_FD]) +then + libc_cv_array_aliasing=yes +else + libc_cv_array_aliasing=no +fi +rm -f conftest*]) +AC_SUBST(libc_cv_array_aliasing) +if test $libc_cv_array_aliasing = yes; then + AC_DEFINE_UNQUOTED(_HAVE_ARRAY_ALIASING) +fi + AC_OUTPUT(Makefile, [if test -n "$CONFIG_FILES"; then unset ac_file |