[Bug 836588] Re: armel FTBFS with gcc 4.5 org 4.6 O2 and fPIC

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On 2011-09-07T03:56:48+00:00 Michael Hope wrote:

Created attachment 25211
Preprocessed source

Building gmime with GCC 4.6.1 for ARM gives the following error:

michaelh at ursa1:~/linaro/bugs$ gcc -c -O2 -fPIC -save-temps gmime2.i
gmime2.s: Assembler messages:
gmime2.s:1007: Error: can't resolve `.rodata' {.rodata section} - `.LPIC18' {*UND* section}

The assembler is correct - the code references a label which doesn't
exist.

The suspicious code is around:
 bl g_hash_table_new(PLT)
 mov sl, r0
 add r0, sp, #32
 bl g_mime_decode_lwsp(PLT)
 ldr r3, .L146+24
 ldr r1, [sp, #4]
 str r3, [sp, #16]
 ldr r3, [sp, #32]
...
.L146:
...
 .word .LANCHOR0-(.LPIC18+4)

The 'ldr r3, .L146+24' references the offset. The value is spilt to the
stack before the normal `add r3, pc` and doesn't seem to be used
afterwards.

The work-around is to compile at -O1 or -O3. The fault also exists in
gcc-4.6.1. It does not exist in gcc-4.5.3 or trunk r178025.

This is in a Cortex-A9+NEON+Thumb-2 configuration.

Reply at: https://bugs.launchpad.net/gcc/+bug/836588/comments/4

------------------------------------------------------------------------
On 2011-09-07T05:55:26+00:00 Mikpe wrote:

I suspect this is a dupe of PR48308.

Reply at: https://bugs.launchpad.net/gcc/+bug/836588/comments/5


** Changed in: gcc
       Status: Unknown => New

** Changed in: gcc
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/836588

Title:
  armel FTBFS with gcc 4.5 org 4.6 O2 and fPIC

Status in The GNU Compiler Collection:
  New
Status in Linaro GCC:
  Triaged
Status in “gcc-4.5” package in Ubuntu:
  Confirmed
Status in “gcc-4.6” package in Ubuntu:
  Confirmed
Status in “gmime2.4” package in Ubuntu:
  Fix Released

Bug description:
  A reference to an inexistent label in the asm file causes FTBFS.
  Using -O1 or dropping -fPIC works fine, so does gcc-4.4 with O2 and fPIC on.

  gcc -DHAVE_CONFIG_H -I. -I.. -I.. -I../util -DGMIME_VERSION=\"2.4.26\" -DGMIME_MAJOR_VERSION=2 -DGMIME_MINOR_VERSION=4 -DGMIME_MICRO_VERSION=26 -DG_LOG_DOMAIN=\"gmime\" -DG_DISABLE_DEPRECATED -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -pthread -I/usr/include/glib-2.0 -I/usr/lib/arm-linux-gnueabi/glib-2.0/include  -O2  -c gmime-param.c  -fPIC  -o .libs/gmime-param.o
  /tmp/ccDqUYcb.s: Assembler messages:
  /tmp/ccDqUYcb.s:1153: Error: can't resolve `.rodata' {.rodata section} - `.LPIC20' {*UND* section}

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