[email protected] writes:
> +AC_DEFUN([gt_BITFIELD_TYPE_MATTERS],
> +[
> + AC_CACHE_CHECK([if the type of bitfields matters],
> gt_cv_bitfield_type_matters,
> + [
> + AC_TRY_COMPILE(
> + [struct foo1 { char x; char :0; char y; };
> +struct foo2 { char x; int :0; char y; };
> +int foo1test[ sizeof (struct foo1) == 2 ? 1 : -1 ];
> +int foo2test[ sizeof (struct foo2) == 5 ? 1 : -1]; ],
> + [], gt_cv_bitfield_type_matters=yes, gt_cv_bitfield_type_matters=no)
> + ])
> + if test $gt_cv_bitfield_type_matters = yes; then
> + AC_DEFINE(HAVE_BITFIELD_TYPE_MATTERS, 1,
> + [Define if the type of bitfields effects alignment.])
> + fi
> +])
gcc/config/aarch64/aarch64.h:#define PCC_BITFIELD_TYPE_MATTERS 1
configure:11554: /opt/gcc/gcc-20150503/Build/./gcc/xgcc
-B/opt/gcc/gcc-20150503/Build/./gcc/ -B/usr/aarch64-suse-linux/bin/
-B/usr/aarch64-suse-linux/lib/ -isystem /usr/aarch64-suse-linux/include
-isystem /usr/aarch64-suse-linux/sys-include -c -O2 -g conftest.c >&5
conftest.c:27:5: error: size of array 'foo2test' is negative
int foo2test[ sizeof (struct foo2) == 5 ? 1 : -1];
^
configure:11554: $? = 1
Andreas.
--
Andreas Schwab, [email protected]
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
