Re: [MacPorts] #39052: clang-3.2: can't compile a program that writes to stderr on PPC

29 Jul 2013

      #39052: clang-3.2: can't compile a program that writes to stderr on PPC
------------------------+------------------------
  Reporter:  takeshi@…  |      Owner:  jeremyhu@…
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.1.3
Resolution:  wontfix    |   Keywords:
      Port:  clang-3.2  |
------------------------+------------------------

Comment (by frederic.devernay@…):

 This also affects clang-3.3, and thus prevents building boost 1.54.0 on
 PPC #39809.
 Shouldn't it be reopened?
 fang@csl.cornell.edu seems to have working clang-3.2 and clang-3.3 builds
 (at least on Tiger) http://vlsi.cornell.edu/~fang/sw/llvm/

 The PPC output has changed a lot between clang-3.1 and clang-3.2.
 Here's a simple program:

 {{{
 #include <stdio.h>

 int main(int argc, char **argv)
 {
   fprintf(stdout,"hello!\n");
   return 0;
 }
 }}}

 Here's the PPC assembly output of clang-3.1/OSX 10.5:

 {{{
         .machine ppc970
         .section        __TEXT,__textcoal_nt,coalesced,pure_instructions
         .section
 __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
         .section        __TEXT,__text,regular,pure_instructions
         .globl  _main
         .align  4
 _main:
         mflr r0
         stw r31, -4(r1)
         stw r0, 8(r1)
         stwu r1, -64(r1)
         bl L0$pb
 L0$pb:
         mr r31, r1
         mflr r4
         addis r3, r4, ha16(L___stdoutp$non_lazy_ptr-L0$pb)
         addis r4, r4, ha16(L_.str-L0$pb)
         lwz r3, lo16(L___stdoutp$non_lazy_ptr-L0$pb)(r3)
         la r4, lo16(L_.str-L0$pb)(r4)
         lwz r3, 0(r3)
         bl _fprintf$LDBL128
         li r3, 0
         addi r1, r1, 64
         lwz r0, 8(r1)
         lwz r31, -4(r1)
         mtlr r0
         blr

         .section        __DATA,__nl_symbol_ptr,non_lazy_symbol_pointers
         .align  2
 L___stdoutp$non_lazy_ptr:
         .indirect_symbol        ___stdoutp
         .long   0

 .subsections_via_symbols
         .section        __TEXT,__cstring,cstring_literals
 L_.str:
         .asciz   "hello!\n"
 }}}

 And here's the output on clang-3.2:

 {{{
         .machine ppc970
         .section        __TEXT,__textcoal_nt,coalesced,pure_instructions
         .section        __TEXT,__text,regular,pure_instructions
         .globl  _main
         .align  4
 _main:
         mflr r0
         stw r31, -4(r1)
         stw r0, 8(r1)
         stwu r1, -64(r1)
         lis r3, ha16(___stdoutp)
         lis r4, ha16(L_.str)
         mr r31, r1
         lwz r3, lo16(___stdoutp)(r3)
         la r4, lo16(L_.str)(r4)
         bl _fprintf$LDBL128
         li r3, 0
         addi r1, r1, 64
         lwz r0, 8(r1)
         lwz r31, -4(r1)
         mtlr r0
         blr

 .subsections_via_symbols
         .section        __TEXT,__cstring,cstring_literals
 L_.str:
         .asciz   "hello!\n"
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/39052#comment:8>
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