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The following patch fixes the C++14 vs. C++17 ABI passing incompatibility on s390x-linux. Bootstrapped/regtested on s390x-linux without and with the patch, the difference being: -FAIL: tmpdir-g++.dg-struct-layout-1/t032 cp_compat_x_alt.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t032 cp_compat_x_tst.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t032 cp_compat_x_tst.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t055 cp_compat_x_alt.o-cp_compat_y_alt.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t055 cp_compat_x_alt.o-cp_compat_y_tst.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t055 cp_compat_x_tst.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t055 cp_compat_x_tst.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t056 cp_compat_x_alt.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t056 cp_compat_x_alt.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t056 cp_compat_x_tst.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t056 cp_compat_x_tst.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t057 cp_compat_x_alt.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t057 cp_compat_x_alt.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t057 cp_compat_x_tst.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t057 cp_compat_x_tst.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t058 cp_compat_x_alt.o-cp_compat_y_alt.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t058 cp_compat_x_alt.o-cp_compat_y_tst.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t058 cp_compat_x_tst.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t058 cp_compat_x_tst.o-cp_compat_y_tst.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t059 cp_compat_x_alt.o-cp_compat_y_alt.o execute FAIL: tmpdir-g++.dg-struct-layout-1/t059 cp_compat_x_alt.o-cp_compat_y_tst.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t059 cp_compat_x_tst.o-cp_compat_y_alt.o execute -FAIL: tmpdir-g++.dg-struct-layout-1/t059 cp_compat_x_tst.o-cp_compat_y_tst.o execute when performing ALT_CXX_UNDER_TEST=g++ testing with a system GCC 10 compiler from a week ago. So, the alt vs. alt FAILs are all expected (we know before this patch there is an ABI incompatibility) and some alt vs. tst (or tst vs. alt) FAILs too - that depends on if the particular x or y test is compiled with -std=c++14 or -std=c++17 - if x_tst is compiled with -std=c++14 and y_alt is compiled with -std=c++17, then it should FAIL, similarly if x_alt is compiled with -std=c++17 and y_tst is compiled with -std=c++14. 2020-04-27 Jakub Jelinek <jakub@redhat.com> PR target/94704 * config/s390/s390.c (s390_function_arg_vector, s390_function_arg_float): Ignore cxx17_empty_base_field_p fields.
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