rts defines "real_main" which can clash with user C code

[duncan]

I was just about to file a bug about ghc -no-hs-main not working but it turns out it is just because I had a real_main C function in my .c file. This ends up clashing with the C function of the same name from the rts package. This means that when linking we pull in the wrong one and the rts one needs __stginit_ZCMain and ZCMain_main_closure which is what the linker error message reports (which is rather confusing).

Suggestion: rename the rts real_main to something less likely to clash with user code.

[duncan]

see also  http://hackage.haskell.org/trac/hackage/ticket/504

[simonmar]

real_main is declared to be static - I don't understand how it could clash?

[simonmar]

Indeed I tried a little example, and didn't see any problems:

#include <stdlib.h>
#include <stdio.h>

void real_main(void)
{
    exit(42);
}

void main(int argc, char *argv[])
{
    printf("main\n");
    real_main();
}

> ./a.out
main
[3]    25611 exit 42    ./a.out