This is the output of a valid 60 line source file compile. The preprocessed source is 30 KB in size and I know that there are no cycles in the code.
$ gcc -v -save-temps reduced-problem.cpp Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release x86_64-linux-gnu Thread model: posix gcc version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5) /usr/lib/gcc/x86_64-linux-gnu/4.1.2/cc1plus -E -quiet -v -D_GNU_SOURCE reduced-problem.cpp -mtune=generic -fpch-preprocess -o reduced-problem.ii ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../x86_64-linux-gnu/include" ignoring nonexistent directory "/usr/include/x86_64-linux-gnu" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2 /usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/x86_64-linux-gnu /usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/backward /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/4.1.2/include /usr/include End of search list. /usr/lib/gcc/x86_64-linux-gnu/4.1.2/cc1plus -fpreprocessed reduced-problem.ii -quiet -dumpbase reduced-problem.cpp -mtune=generic -auxbase reduced-problem -version -fstack-protector -fstack-protector -o reduced-problem.s GNU C++ version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5) (x86_64-linux-gnu) compiled by GNU C version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5). GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: cb8dbea25f87c7cd7562ef1cc3d1246e cc1plus: out of memory allocating 770058242 bytes after a total of 1343488 bytes -- Summary: GCC crashes with OOM when compiling trivial source file (no endless loop) Product: gcc Version: 4.1.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: aribrei at arcor dot de GCC build triplet: x86_64-linux-gnu GCC host triplet: x86_64-linux-gnu GCC target triplet: x86_64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32290