[gcc r12-7951] testsuite: Add further zero size elt passing tests [PR102024]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:e0ce885851dfd926c0cfe6f23a2debc87ea2bb9d

commit r12-7951-ge0ce885851dfd926c0cfe6f23a2debc87ea2bb9d
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Apr 1 11:49:40 2022 +0200

    testsuite: Add further zero size elt passing tests [PR102024]
    
    As discussed in PR102024, zero width bitfields might not be the only ones
    causing ABI issues at least on mips, zero size arrays or (in C only) zero
    sized (empty) structures can be problematic too.
    
    The following patch adds some coverage for it too.
    
    Tested on x86_64-linux with
    make check-gcc check-g++ RUNTESTFLAGS='ALT_CC_UNDER_TEST=gcc ALT_CXX_UNDER_TEST=g++ --target_board=unix\{-m32,-m64\} compat.exp=pr102024*'
    make check-gcc check-g++ RUNTESTFLAGS='ALT_CC_UNDER_TEST=clang ALT_CXX_UNDER_TEST=clang++ --target_board=unix\{-m32,-m64\} compat.exp=pr102024*'
    with gcc/g++ 10.3 and clang 11.  Everything but (expectedly)
    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
    for -m64 ALT_CC_UNDER_TEST=gcc passes.
    
    2022-04-01  Jakub Jelinek  <jakub@redhat.com>
    
            PR target/102024
            * gcc.dg/compat/pr102024_test.h: Add further tests with zero sized
            structures and arrays.
            * g++.dg/compat/pr102024_test.h: Add further tests with zero sized
            arrays.

Diff:
---
 gcc/testsuite/g++.dg/compat/pr102024_test.h | 6 ++++++
 gcc/testsuite/gcc.dg/compat/pr102024_test.h | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/gcc/testsuite/g++.dg/compat/pr102024_test.h b/gcc/testsuite/g++.dg/compat/pr102024_test.h
index d8f4103f63c..488a8ea188a 100644
--- a/gcc/testsuite/g++.dg/compat/pr102024_test.h
+++ b/gcc/testsuite/g++.dg/compat/pr102024_test.h
@@ -4,3 +4,9 @@ T(2,int:0;float a;,F(2,a,2.25f,16.5f))
 T(3,double a;long long:0;double b;,F(3,a,42.0,43.125)F(3,b,-17.5,35.75))
 T(4,double a;long long:0;,F(4,a,1.0,17.125))
 T(5,long long:0;double a;,F(5,a,2.25,16.5))
+T(6,float a;struct{}b[0];float c;,F(6,a,42.0f,43.125f)F(6,c,-17.5f,35.75f))
+T(7,float a;struct{}b[0];;,F(7,a,1.0f,17.125f))
+T(8,int a[0];float b;,F(8,b,2.25f,16.5f))
+T(9,double a;long long b[0];double c;,F(9,a,42.0,43.125)F(9,c,-17.5,35.75))
+T(10,double a;struct{}b[0];,F(10,a,1.0,17.125))
+T(11,struct{}a[0];double b;,F(11,b,2.25,16.5))
diff --git a/gcc/testsuite/gcc.dg/compat/pr102024_test.h b/gcc/testsuite/gcc.dg/compat/pr102024_test.h
index d8f4103f63c..d610dbdf54f 100644
--- a/gcc/testsuite/gcc.dg/compat/pr102024_test.h
+++ b/gcc/testsuite/gcc.dg/compat/pr102024_test.h
@@ -4,3 +4,9 @@ T(2,int:0;float a;,F(2,a,2.25f,16.5f))
 T(3,double a;long long:0;double b;,F(3,a,42.0,43.125)F(3,b,-17.5,35.75))
 T(4,double a;long long:0;,F(4,a,1.0,17.125))
 T(5,long long:0;double a;,F(5,a,2.25,16.5))
+T(6,float a;struct{}b;float c;,F(6,a,42.0f,43.125f)F(6,c,-17.5f,35.75f))
+T(7,float a;struct{}b[0];;,F(7,a,1.0f,17.125f))
+T(8,int a[0];float b;,F(8,b,2.25f,16.5f))
+T(9,double a;long long b[0];double c;,F(9,a,42.0,43.125)F(9,c,-17.5,35.75))
+T(10,double a;struct{}b;,F(10,a,1.0,17.125))
+T(11,struct{}a[0];double b;,F(11,b,2.25,16.5))