Bug#635153: g++-4.6: ICE on ia64 when building iceweasel 5.0-4

[Patrick Baggett <baggett.patrick@gmail.com>]

This is still a problem on gcc 4.6.3(-12). I am able to successfully compile the given test code with gcc 4.7.2 though:

figgles@itanic:~$ g++-4.7 bug635153.c -fvisibility=hidden -fno-exceptions -g -Os -c

Also, it appears that the combination of flags has an effect on producing the ICE.

figgles@itanic:~$ g++ bug635153.c -fvisibility=hidden -fno-exceptions -g -Os -c

In file included from nsRuleNode.cpp:82:0:

CSSCalc.h: In function 'typename CalcOps::result_type mozilla::css::ComputeCalc(const typename CalcOps::input_type&, CalcOps&) [with CalcOps = CalcLengthCalcOps, typename CalcOps::result_type = int, typename CalcOps::input_type = nsCSSValue]':

CSSCalc.h:144:1: internal compiler error: in dwarf2out_cfi_begin_epilogue, at dwarf2out.c:3015

Please submit a full bug report,

with preprocessed source if appropriate.

See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.

^C

figgles@itanic:~$ g++ bug635153.c -fvisibility=hidden -fno-exceptions -Os -c

figgles@itanic:~$ g++ bug635153.c  -fno-exceptions -g -Os -c

figgles@itanic:~$ g++ bug635153.c -fvisibility=hidden -fno-exceptions -g -c

In other words:

With "-Os -g -fvisibility=hidden" -> CRASH

With "-Os -fvisibility=hidden" -> OK

With "-Os -g" -> OK

With "-g -fvisibility=hidden" -> OK

Apparenly when "-Os" is enabled AND *both* "-g" and "-fvisibility=hidden" are enabled, THEN you get a crash. Using "-Os" with only one of "-g" and "-fvisibility=hidden" will successfully compile it.

Patrick