ENH: Improve robustness of compiler INFO strings

Compiler INFO strings built at preprocessing time encode information
that must appear as a string literal in the resulting binary.  We must
make sure the strings appear in the final binary no matter what compiler
and flags are used.  The previous implementation worked in most places
but failed with the GNU linker's --gc-sections option which managed to
discard the string.  Instead we make the program return value depend on
an element of the string indexed by a runtime program parameter, which
absolutely requires the string to be present.

1 files changed, 8 insertions, 5 deletions

diff --git a/Modules/TestEndianess.c.in b/Modules/TestEndianess.c.in
index 68094d4ac6..c924f7858a 100644
--- a/Modules/TestEndianess.c.in
+++ b/Modules/TestEndianess.c.in
@@ -10,11 +10,14 @@ const cmakeint16 info_little[] =  {0x4854, 0x5349, 0x4920, 0x2053, 0x494c, 0x545
 const cmakeint16 info_big[] =     {0x5448, 0x4953, 0x2049, 0x5320, 0x4249, 0x4720, 0x454e, 0x4449, 0x414e, 0x2e2e, 0x0000};
 
 #ifdef __CLASSIC_C__
-int main(){
-  int ac;
-  char*av[];
+int main(argc, argv) int argc; char *argv[];
 #else
-int main(int ac, char*av[]){
+int main(int argc, char *argv[])
 #endif
-   return (&info_little[0] != &info_big[0]);
+{
+  int require = 0;
+  require += info_little[argc];
+  require += info_big[argc];
+  (void)argv;
+  return require;
 }