Bug 31937

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User-Agent: Mozilla/4.76 [en] (X11; U; Linux 2.4.2-ac11 i686)


Trying to compile Mozilla CVS with gcc-2.96-69, when it reaches
nsStyleContext.cpp in mozilla/content/base/src, c++ hangs for many minutes
and finally crashes trying to allocate a huge amount of memory.

Running "top" we can see cc1plus using a lot of CPU and slowly growing in
memory usage. The output from the make is the following:

c++ -o nsStyleContext.o -c -DOSTYPE=\"Linux2.4\" -DOJI -D_IMPL_NS_LAYOUT  
-I../../../dist/include -I../../../dist/include      -I./../../events/src
-I./../../html/base/src -I./../../html/style/src -I./../../xul/base/src
-I./../../xul/content/src  -I/usr/X11R6/include   -fPIC 
-I/usr/X11R6/include -fno-rtti -fno-exceptions -Wall -Wconversion
-Wpointer-arith -Wbad-function-cast -Wcast-align -Woverloaded-virtual
-Wsynth -pedantic -Wno-long-long -pipe -pthread -O2  -DNDEBUG -DTRIMMED
-I/usr/X11R6/include -DMOZILLA_CLIENT -include ../../../config-defs.h
-Wp,-MD,.deps/nsStyleContext.pp nsStyleContext.cpp
nsStyleContext.cpp: In method `nsresult StyleContextImpl::RemapStyle
(nsIPresContext *, int)':
nsStyleContext.cpp:3487: warning: unused variable `nsresult rv'
nsStyleContext.cpp:3573: warning: unused variable `nsresult rv'
nsStyleContext.cpp:3617: warning: unused variable `nsresult result'

Cannot allocate 1911936300 bytes after allocating 15497788 bytes
make[3]: *** [nsStyleContext.o] Error 1

If I remove the "-O2" from the build line and compile unoptimized, the file
builds correctly. This is one of two files in the Mozilla source that has
this problem (the other is
mozilla/layout/html/forms/src/nsGfxTextControlFrame2.cpp) although I have
seen a similar problem in the past building avifile.


Reproducible: Always
Steps to Reproduce:
Take the included nsStyleContext.ii file and compile it with the command
line in the "compile" file.

Actual Results:  c++ will hang and eventually crash for lack of memory.	

Expected Results:  The file should compile and produce a usable
nsStyleContext.o file.