I just tried to compile a small piece of source code with the new GNU C compiler version 4.2 snapshot 20060506.
The compiler snapshot said [EMAIL PROTECTED]:~/gnu/42-20060506/bugs> ~/gnu/42-20060506/results/bin/g++ -c -O3 bug16.cc bug16.cc: In function 'bool cross(const LineSegment&, const LineSegment&)': bug16.cc:49: 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. Preprocessed source code attached. Flag -O3 required. This code compiled ok on the previous snapshot 20060429. Valgrind says the following ==9134== Invalid read of size 2 ==9134== at 0x98D8F7: hash_descriptor_pre_extension (see.c:837) ==9134== by 0x9C92E1: htab_find_slot (hashtab.c:657) ==9134== by 0x98E5B7: see_seek_pre_extension_expr (see.c:1036) ==9134== by 0x98E6E7: see_set_prop_unmerged_def (see.c:2280) ==9134== by 0x9C89F7: htab_traverse_noresize (hashtab.c:729) ==9134== by 0x98E497: see_handle_extensions_for_one_ref (see.c:2986) ==9134== by 0x9C9B68: splay_tree_foreach_helper (splay-tree.c:218) ==9134== by 0x990D10: see_main (see.c:3021) ==9134== by 0x9913D5: rest_of_handle_see (see.c:3754) ==9134== by 0x88E24A: execute_one_pass (passes.c:864) ==9134== by 0x88E3BB: execute_pass_list (passes.c:911) ==9134== by 0x88E3CD: execute_pass_list (passes.c:912) ==9134== Address 0x0 is not stack'd, malloc'd or (recently) free'd The source code is struct Point { float x; float y; }; struct LineSegment { Point start; Point end; }; inline float min( float x, float y) { return (x < y) ? x : y; } inline float max( float x, float y) { return (x > y) ? x : y; } bool cross( const LineSegment & ls1, const LineSegment & ls2) { const float slope1 = (ls1.end.y - ls1.start.y) / (ls1.end.x - ls1.start.x); const float intercept1 = ls1.end.y - (slope1 * ls1.end.x); const float slope2 = (ls2.end.y - ls2.start.y) / (ls2.end.x - ls2.start.x); const float intercept2 = ls2.end.y - (slope2 * ls2.end.x); if (slope1 == slope2) { return (intercept1 == intercept2); } const float x = (intercept1 - intercept2) / (slope2 - slope1); const float ls1minx = min( ls1.start.x, ls1.end.x); const float ls1maxx = max( ls1.start.x, ls1.end.x); if ((ls1minx < x) && (x < ls1maxx)) { const float ls2minx = min( ls2.start.x, ls2.end.x); const float ls2maxx = max( ls2.start.x, ls2.end.x); return (ls2minx < x) && (x < ls2maxx); } } -- Summary: ice for legal code Product: gcc Version: 4.2.0 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: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27472
