int v; class C { public: C() { v++; } } c; int main () {} i686-pc-mingw32-g++ -Wall -g mingw32-gcc-c++-4.5.0-1.fc14.x86_64 PASS: pre-physname GNU gdb (GDB) 7.1.50.20100309-cvs Breakpoint 1 at 0x40133f: file ..., line 13. FAIL: post-physname GNU gdb (GDB) 7.3.50.20110415-cvs Breakpoint 1 at 0x40133a: file ..., line 12. Dump of assembler code for function main: 0x00401334 <+0>: push %ebp 0x00401335 <+1>: mov %esp,%ebp 0x00401337 <+3>: and $0xfffffff0,%esp <-- FAIL 0x0040133a <+6>: call 0x401530 <__main> <-- PASS 0x0040133f <+11>: call 0x401322 <_Z1fv> 0x00401344 <+16>: mov $0x0,%eax 0x00401349 <+21>: mov %ebp,%esp 0x0040134b <+23>: pop %ebp 0x0040134c <+24>: ret SYMBOL_LINKAGE_NAME was "main" before. It is "main()" now for symtabs. This breaks the skip_prologue_sal comparison for gdbarch_skip_main_prologue. SYMBOL_LINKAGE_NAME is no longer a linkage name for symtabs, it is demangled now, such as `C::C(C const&)'. SYMBOL_LINKAGE_NAME is mangled for minsyms. SYMBOL_LINKAGE_NAME behaves differently for symbols vs. minsyms. This is a regression by the patch: 42284fdf9d8cdb20c8e833bdbdb2b56977fea525 http://sourceware.org/ml/gdb-cvs/2010-03/msg00082.html dwarf2_physname patchset: [RFA] dwarf2_physname FINAL http://sourceware.org/ml/gdb-patches/2010-03/msg00220.html
Is this still a problem? With 7.1 and also with cvs trunk I get (gdb) b main Breakpoint 1 at 0x40136b: file pr.cc, line 1. (gdb) disassemble main Dump of assembler code for function main: 0x00401360 <+0>: push %ebp 0x00401361 <+1>: mov %esp,%ebp 0x00401363 <+3>: and $0xfffffff0,%esp 0x00401366 <+6>: call 0x401a60 <__main> 0x0040136b <+11>: mov $0x0,%eax 0x00401370 <+16>: leave 0x00401371 <+17>: ret With 6.8 I get (gdb) b main Breakpoint 1 at 0x401366: file pr.cc, line 1.
[RFC] symtab.c: Change skip_prologue_sal comparison to match main() too http://sourceware.org/ml/gdb-patches/2012-03/msg00454.html Message-ID: <20120313155817.44b4f280@mesquite.lan> fda4b74499e5d26b718a51b84ec637e435997fa6 is the first bad (=good) commit commit fda4b74499e5d26b718a51b84ec637e435997fa6 Author: Kevin Buettner <kevinb@redhat.com> Date: Wed Mar 21 21:59:12 2012 +0000 * symtab.c (skip_prologue_sal): Change test to check for "main()" in addition to "main".