https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102024
--- Comment #19 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:568377743e22c1377d0aaa1ac9113da3ff1b6bd4 commit r12-7798-g568377743e22c1377d0aaa1ac9113da3ff1b6bd4 Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Mar 24 12:25:15 2022 +0100 testsuite: Add compat.exp testcase for most common zero width bitfld ABI passing [PR102024] On Tue, Mar 22, 2022 at 05:51:58PM +0100, Jakub Jelinek via Gcc wrote: > I guess it would be nice to include the testcases we are talking about, > like { float x; int : 0; float y; } and { float x; int : 0; } and > { int : 0; float x; } into compat.exp testsuite so that we see ABI > differences in compat testing. Here is a patch that does that. It uses the struct-layout-1* framework, but isn't generated because we don't want in this case pseudo-random structure layouts, but particular ones we know cause or could cause problems on some targets. If other problematic cases are discovered, we can add further ones. Tested on x86_64-linux with: make check-gcc check-g++ RUNTESTFLAGS='ALT_CC_UNDER_TEST=gcc ALT_CXX_UNDER_TEST=g++ compat.exp=pr102*' and with make check-gcc check-g++ RUNTESTFLAGS='compat.exp=pr102*' The former as expected has: FAIL: gcc.dg/compat/pr102024 c_compat_x_tst.o-c_compat_y_alt.o execute FAIL: gcc.dg/compat/pr102024 c_compat_x_alt.o-c_compat_y_tst.o execute fails because on x86_64 we've changed the C ABI but kept the C++ ABI here. E.g. on rs6000 it should be the g++.dg such tests to fail (all assuming the alt gcc/g++ is GCC 4.5 through 11). 2022-03-24 Jakub Jelinek <ja...@redhat.com> PR target/102024 * gcc.dg/compat/pr102024_main.c: New test. * gcc.dg/compat/pr102024_test.h: New test. * gcc.dg/compat/pr102024_x.c: New test. * gcc.dg/compat/pr102024_y.c: New test. * g++.dg/compat/pr102024_main.C: New test. * g++.dg/compat/pr102024_test.h: New test. * g++.dg/compat/pr102024_x.C: New test. * g++.dg/compat/pr102024_y.C: New test.
