Understanding opt constantly building problem with g++

Understanding opt constantly building problem with g++

[corey taylor]

This isn't a problem I typically encounter so I am hoping for some
pointers on the steps to debug.

I'm calling it infinite, but I've always just terminated the build
after a long time of waiting.  I don't know what to call this
apparently as I've tried searching the mailing list + bugzilla for
information but nothing comes up related to this type of problem.

I'm using 4.2.1 and have seen this one or twice before on a mingw
build I think, but this is the first time I've encountered it on my
linux build.  Only thing I know at the moment is that the hang happens
during the compile step and that I can only get through preprocessing
(-E) for sure.

This only happens when building with an opt build such as -O3.

I've tried working it down to test case  that doesn't involve building
the library that this test suite is a part of, but so far no luck -- I
will have to try and work with it as part of the test suite file
itself.  I've narrowed it down to a section of the code that is purely
a set of macros that call into each other and contain something like
do { ... } while (0).

I can past the library context-specific code that produces this if it
matters for creating steps to debug (the whole file is ~150 lines when
reduced).


g++ -v
Using built-in specs.
Target: x86_64-suse-linux
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,java,ada
--enable-checking=release
--with-gxx-include-dir=/usr/include/c++/4.2.1 --enable-ssp
--disable-libssp --disable-libgcj --with-slibdir=/lib64
--with-system-zlib --enable-shared --enable-__cxa_atexit
--enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--program-suffix=-4.2 --enable-version-specific-runtime-libs
--without-system-libunwind --with-cpu=generic --host=x86_64-suse-linux
Thread model: posix
gcc version 4.2.1 (SUSE Linux)

The compile command looks like this:

/usr/bin/g++ -O3 -D_RELEASE -fno-trapping-math -s -pipe -Wall
-Wformat=2 -c -I /usr/include/ -I /usr/include/SDL/ -I
/usr/local/include/SDL11/ -I /usr/local/include/ -I
/usr/X11R6/include/ -I ../G3D.lib/include -I ../GLG3D.lib/include -o
.ice-tmp/test/linux-x86_64-g++-4.2/RELEASE/tTextInput.o
/tTextInput.cpp


corey