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* [Bug optimization/14890] New: SCCS version stamps gets optimized away @ 2004-04-08 13:56 gbruchhaeuser at orga-systems dot com 2004-04-08 14:18 ` [Bug optimization/14890] " gbruchhaeuser at orga-systems dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: gbruchhaeuser at orga-systems dot com @ 2004-04-08 13:56 UTC (permalink / raw) To: gcc-bugs Say a file called 'main.cc' contains: --- volatile const char main_cc_ID[] = "@(#): main.cc#4"; int main() { return 0; } --- and it gets compiled like: g++ -O0 -o main main.cc then 'what main' (alternativly 'strings main | grep "(#)"') shows the proper content of variable 'main_cc_ID'. The problem is that once we compile with '-O1' then the variable gets optimized away from the binary. A second issue is that g++ reports a warning if we remove the 'const' from the declaration and the string remains in the binary also if we compile with '-O2'. It would be really greate if g++ would keep such 'volatile static const char' array's in within binary and would not printout a warning although with '-Wall' for them. Of course, the warning is not the real problem ;-) -but its quite difficult to grep it away since g++ wraps lines when filename and/or variablenames get to long. -- Summary: SCCS version stamps gets optimized away Product: gcc Version: 3.3.1 Status: UNCONFIRMED Severity: critical Priority: P2 Component: optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: gbruchhaeuser at orga-systems dot com CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14890 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/14890] SCCS version stamps gets optimized away 2004-04-08 13:56 [Bug optimization/14890] New: SCCS version stamps gets optimized away gbruchhaeuser at orga-systems dot com @ 2004-04-08 14:18 ` gbruchhaeuser at orga-systems dot com 2004-04-08 14:40 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: gbruchhaeuser at orga-systems dot com @ 2004-04-08 14:18 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Severity|critical |normal http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14890 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/14890] SCCS version stamps gets optimized away 2004-04-08 13:56 [Bug optimization/14890] New: SCCS version stamps gets optimized away gbruchhaeuser at orga-systems dot com 2004-04-08 14:18 ` [Bug optimization/14890] " gbruchhaeuser at orga-systems dot com @ 2004-04-08 14:40 ` pinskia at gcc dot gnu dot org 2004-04-08 14:42 ` pinskia at gcc dot gnu dot org 2004-04-08 16:44 ` gbruchhaeuser at orga-systems dot com 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-04-08 14:40 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-04-08 14:40 ------- Invalid, use the attribute used like so: volatile const char main_cc_ID[] __attribute__((used)) = "@(#): main.cc#4"; -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14890 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/14890] SCCS version stamps gets optimized away 2004-04-08 13:56 [Bug optimization/14890] New: SCCS version stamps gets optimized away gbruchhaeuser at orga-systems dot com 2004-04-08 14:18 ` [Bug optimization/14890] " gbruchhaeuser at orga-systems dot com 2004-04-08 14:40 ` pinskia at gcc dot gnu dot org @ 2004-04-08 14:42 ` pinskia at gcc dot gnu dot org 2004-04-08 16:44 ` gbruchhaeuser at orga-systems dot com 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-04-08 14:42 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-04-08 14:42 ------- Also the warning has been fix for 3.3.3. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14890 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug optimization/14890] SCCS version stamps gets optimized away 2004-04-08 13:56 [Bug optimization/14890] New: SCCS version stamps gets optimized away gbruchhaeuser at orga-systems dot com ` (2 preceding siblings ...) 2004-04-08 14:42 ` pinskia at gcc dot gnu dot org @ 2004-04-08 16:44 ` gbruchhaeuser at orga-systems dot com 3 siblings, 0 replies; 5+ messages in thread From: gbruchhaeuser at orga-systems dot com @ 2004-04-08 16:44 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From gbruchhaeuser at orga-systems dot com 2004-04-08 16:44 ------- Well, this solution would break source compatibility with Compaqs DEC-C++ compiler which down't know about '__attribute__((used))'. A macro may workarround this problem but there are still a plenty of source files (3302 in this project) to change. Isn't there any other possibility? Say a command line parameter or so?? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14890 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-04-08 16:44 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-04-08 13:56 [Bug optimization/14890] New: SCCS version stamps gets optimized away gbruchhaeuser at orga-systems dot com 2004-04-08 14:18 ` [Bug optimization/14890] " gbruchhaeuser at orga-systems dot com 2004-04-08 14:40 ` pinskia at gcc dot gnu dot org 2004-04-08 14:42 ` pinskia at gcc dot gnu dot org 2004-04-08 16:44 ` gbruchhaeuser at orga-systems dot com
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