[Bug 721531] Re: [armel] gcc computes wrong address for main() at build time

[Peter Maydell]

For the record, this bites QEMU compiled on Natty as well (and results
in an immediate crash on startup).

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https://bugs.launchpad.net/bugs/721531

Title:
  [armel] gcc computes wrong address for main() at build time

Status in The GNU Compiler Collection:
  Confirmed
Status in Linaro GCC:
  Fix Released
Status in Linaro GCC 4.5 series:
  Fix Released
Status in Linaro GCC 4.6 series:
  Fix Released
Status in “gcc-4.5” package in Ubuntu:
  Fix Released
Status in “gcc-4.6” package in Ubuntu:
  Fix Released
Status in “gcc-4.5” source package in Natty:
  Won't Fix
Status in “gcc-4.6” source package in Natty:
  Invalid
Status in “gcc-4.5” source package in Oneiric:
  Fix Released
Status in “gcc-4.6” source package in Oneiric:
  Fix Released

Bug description:
  Binary package hint: gcc-4.5

  During the debugging of mono, we found a confirmed tool chain
  regression and isolated it down to a testcase:

  Test code:

  void main() {
          void *p = main;
          if ((int)p & 1) printf ("HIT!\n"); 
  }

  Output:

  mcasadevall at risingsun:~/tmp$ gcc  -g test.c 
  test.c: In function 'main':
  test.c:3:18: warning: incompatible implicit declaration of built-in function 'printf'
  mcasadevall at risingsun:~/tmp$ ./a.out 
  HIT!

  mcasadevall at risingsun:~/tmp$ gcc  -g -O2 test.c 
  test.c: In function 'main':
  test.c:3:18: warning: incompatible implicit declaration of built-in function 'printf'
  mcasadevall at risingsun:~/tmp$ ./a.out 
  mcasadevall at risingsun:~/tmp$ 

  Doesn't occur with gcc-4.4.

  Additional comments from #monodev:
  16:26:58 < vargaz> NCommander: it seems to think function addresses on arm 
                     have their lowest bit set to 0, which is not true for 
                     thumb.

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