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Debugging optimizedDebugging optimizedPosted Apr 15, 2010 23:46 UTC (Thu) by jreiser (subscriber, #11027)In reply to: Debugging optimized by ncm Parent article: GCC 4.5.0 released ... an ability to compile as if maximally optimizing, and actually emitting all attendant warnings, but writing out unoptimized, maximally debuggable code. What more than: gcc -O3 -c foo.c && gcc -g -O0 -c foo.c >/dev/null 2>&1 ?
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Debugging optimized Posted Apr 16, 2010 9:21 UTC (Fri) by jengelh (subscriber, #33263) [Link] >What more than [...]? -Wall, for one. -ggdb3, for another. And for completeness, -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wshadow -Wstrict-prototypes.
Debugging optimized Posted Apr 16, 2010 16:28 UTC (Fri) by jzbiciak (✭ supporter ✭, #5246) [Link] Oy... The redundant declarations one is maybe a bit annoying. :-) Otherwise, I use these other flags as well: -Wall -W -Wpointer-arith -Wbad-function-cast -Wcast-qual -Wc++-compat Now if flex-generated code didn't cause so many warnings. The only warnings in my own "major" app, jzIntv, come from code I didn't write: bincfg/bincfg_lex.c: In function yy_get_next_buffer: bincfg/bincfg_lex.c:1858: warning: comparison between signed and unsigned bincfg/bincfg_lex.c: At top level: bincfg/bincfg_lex.c:2413: warning: no previous prototype for bc_get_lineno bincfg/bincfg_lex.c:2422: warning: no previous prototype for bc_get_in bincfg/bincfg_lex.c:2430: warning: no previous prototype for bc_get_out bincfg/bincfg_lex.c:2438: warning: no previous prototype for bc_get_leng bincfg/bincfg_lex.c:2447: warning: no previous prototype for bc_get_text bincfg/bincfg_lex.c:2456: warning: no previous prototype for bc_set_lineno bincfg/bincfg_lex.c:2468: warning: no previous prototype for bc_set_in bincfg/bincfg_lex.c:2473: warning: no previous prototype for bc_set_out bincfg/bincfg_lex.c:2478: warning: no previous prototype for bc_get_debug bincfg/bincfg_lex.c:2483: warning: no previous prototype for bc_set_debug bincfg/bincfg_lex.c:2517: warning: no previous prototype for bc_lex_destroy *sigh* I have a severe allergy to tweaking generated code.
Debugging optimized Posted Apr 16, 2010 10:40 UTC (Fri) by nix (subscriber, #2304) [Link]
That does the work twice. We *already* have LTO doing the work twice: add this, and we'd be doing the work four times over (or we would do once LTO and debugging information play well together).
This feels a right waste to me.
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