I just tried to compile Suse Linux package sane-backends-1.0.18-5 with the GNU C++ compiler version 4.3 snapshot 20070216.
The compiler said plustek-pp_dac.c: In function 'dacP98WaitForShading': plustek-pp_dac.c:780: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. Here is some output from valgrind ==17180== Invalid read of size 8 ==17180== at 0x674ADB: bsi_for_stmt (tree-flow-inline.h:744) ==17180== by 0x9C3DFC: vect_get_vec_def_for_operand (tree-vect-transform.c:638) ==17180== by 0x9C6520: vectorizable_store (tree-vect-transform.c:3210) ==17180== by 0x9CC6BB: vect_transform_loop (tree-vect-transform.c:4270) ==17180== by 0x775216: vectorize_loops (tree-vectorizer.c:2187) ==17180== by 0x5F9060: execute_one_pass (passes.c:1055) ==17180== by 0x5F921B: execute_pass_list (passes.c:1107) ==17180== by 0x5F922D: execute_pass_list (passes.c:1108) ==17180== by 0x5F922D: execute_pass_list (passes.c:1108) ==17180== by 0x6B73A6: tree_rest_of_compilation (tree-optimize.c:412) ==17180== by 0x40AADB: c_expand_body (c-decl.c:6842) ==17180== by 0x7ED120: cgraph_expand_function (cgraphunit.c:1008) ==17180== Address 0x0 is not stack'd, malloc'd or (recently) free'd Preprocessed source code attached. Flags -ftree-vectorize -O2 required. -- Summary: ice for legal code with -ftree-vectorize -O2 Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dcb314 at hotmail dot com GCC host triplet: x86_suse-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30843