[Bug gas/11054] New: Suspicious error "missing .fnstart before unwinding directive" from libffi's ARM code

[flameeyes at gmail dot com]

I found this out while trying to build a cross-gcj compiler for ARM targets:
when using binutils 2.20 the build fails at libffi because of this error:

libtool: compile: 
/var/tmp/cross/arm-carel-linux-gnu/portage/cross-arm-carel-linux-gnu/gcc-4.3.4/work/build/./gcc/xgcc
-B/var/tmp/cross/arm-carel-linux-gnu/portag
e/cross-arm-carel-linux-gnu/gcc-4.3.4/work/build/./gcc/
-B/usr/arm-carel-linux-gnu/bin/ -B/usr/arm-carel-linux-gnu/lib/ -isystem
/usr/arm-carel-linux-gnu/include -
isystem /usr/arm-carel-linux-gnu/sys-include -I.
-I/var/tmp/cross/arm-carel-linux-gnu/portage/cross-arm-carel-linux-gnu/gcc-4.3.4/work/gcc-4.3.4/libffi/include
-Ii
nclude
-I/var/tmp/cross/arm-carel-linux-gnu/portage/cross-arm-carel-linux-gnu/gcc-4.3.4/work/gcc-4.3.4/libffi/src
-O2 -g -O2 -pipe -c /var/tmp/cross/arm-carel-linu
x-gnu/portage/cross-arm-carel-linux-gnu/gcc-4.3.4/work/gcc-4.3.4/libffi/src/arm/sysv.S
 -fPIC -DPIC -o src/arm/.libs/sysv.o
/var/tmp/cross/arm-carel-linux-gnu/portage/cross-arm-carel-linux-gnu/gcc-4.3.4/work/gcc-4.3.4/libffi/src/arm/sysv.S:
Assembler messages:
/var/tmp/cross/arm-carel-linux-gnu/portage/cross-arm-carel-linux-gnu/gcc-4.3.4/work/gcc-4.3.4/libffi/src/arm/sysv.S:238:
Error: missing .fnstart before unwinding directive

Tracking this down, seems like it doesn't like .pad directive if it's not
prefixed by the @ symbol. Unfortunately I'm not really much into ARM assembly so
I can't tell what the problem is there. binutils 2.18 builds libffi perfectly
fine as far as I can tell.

I'm attaching two testcases that reduce the problem; testcase2.s is a reduced
case as taken by sysv.S, while testcase3.s is a working alternative; I have no
idea if they are meant to be the same though, I'm afraid.

-- 
           Summary: Suspicious error "missing .fnstart before unwinding
                    directive" from libffi's ARM code
           Product: binutils
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: flameeyes at gmail dot com
                CC: bug-binutils at gnu dot org
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: arm-*-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11054

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