[Bug testsuite/116148] c-c++-common/fam-in-union-alone-in-struct-2.c fails on big-endian (finally tested starting with r15-2403-g136f364e26d9ad)

[linkw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116148

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |linkw at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2024-07-31

--- Comment #3 from Kewen Lin <linkw at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > This testcase was only designed for little-endian ...
> 
> That is it needs some changes to the checks to allow to run correctly on
> big-endian.

Indeed, the below adjustment makes it pass on BE.

diff --git a/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
b/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
index 93f9d5128f6..7845a7fbab3 100644
--- a/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
+++ b/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
@@ -16,7 +16,7 @@ union with_fam_2 {
 union with_fam_3 {
   char a[];
   int b[];
-} with_fam_3_v = {.b = {0x1f2f3f4f, 0x5f6f7f7f}};
+} with_fam_3_v = {.b = {0x1f2f3f4f, 0x5f6f7f8f}};

 struct only_fam {
   int b[];
@@ -28,16 +28,28 @@ struct only_fam_2 {
   int b[];
 } only_fam_2_v = {{7, 11}};

+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define WITH_FAM_2_V_B0 0x4f
+#define WITH_FAM_2_V_B3 0x1f
+#define WITH_FAM_3_V_A0 0x4f
+#define WITH_FAM_3_V_A7 0x5f
+#else
+#define WITH_FAM_2_V_B0 0x1f
+#define WITH_FAM_2_V_B3 0x4f
+#define WITH_FAM_3_V_A0 0x1f
+#define WITH_FAM_3_V_A7 0x8f
+#endif
+
 int main ()
 {
   if (with_fam_1_v.b[3] != 4
       || with_fam_1_v.b[0] != 1)
     __builtin_abort ();
-  if (with_fam_2_v.b[3] != 0x1f
-      || with_fam_2_v.b[0] != 0x4f)
+  if (with_fam_2_v.b[3] != WITH_FAM_2_V_B3
+      || with_fam_2_v.b[0] != WITH_FAM_2_V_B0)
     __builtin_abort ();
-  if (with_fam_3_v.a[0] != 0x4f
-      || with_fam_3_v.a[7] != 0x5f)
+  if (with_fam_3_v.a[0] != WITH_FAM_3_V_A0
+      || with_fam_3_v.a[7] != WITH_FAM_3_V_A7)
     __builtin_abort ();
   if (only_fam_v.b[0] != 7
       || only_fam_v.b[1] != 11)