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Bug 92377
| Summary: | Code generated with "bison -y" fails with g++ | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Raw Hide | Reporter: | John Ellson <john.ellson> |
| Component: | bison | Assignee: | Roland McGrath <roland> |
| Status: | CLOSED DUPLICATE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 1.0 | CC: | chabotc |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-02-21 18:53:28 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Also fails with g++ from today's gcc-3.3-4 Verified that it also happens for me on RH9 and rawhide-current (20030609) with gcc-3.3-5 and bison-1.875. Commenting out the macro from yacc.c is a workaround i gues (ran into the problem while compiling groff) *** This bug has been marked as a duplicate of 92262 *** Changed to 'CLOSED' state since 'RESOLVED' has been deprecated. |
Description of problem: Code generated with "bison -y" fails with g++ The problem originates from the fragment: /usr/share/bison/yacc.c:1116 #if defined (__GNUC_MINOR__) && 2093 <= (__GNUC__ * 1000 + __GNUC_MINOR__) __attribute__ ((__unused__)) #endif The "__attribute__ ((__unused__))" feature is supported by gcc, but apparently not by g++. Version-Release number of selected component (if applicable): bison-1.875-2 gcc-3.2.3-4 How reproducible: 100% Steps to Reproduce: 1. --- test.c --- int main() { yyerrlab1: __attribute__ ((__unused__)) goto yyerrlab2; yyerrlab2: return(0); } 2. gcc -Wall test.c 3. g++ -Wall test.c Actual results: gcc OK g++ fails with: test.c: In function `int main()': test.c:4: syntax error before `goto' test.c:5: warning: label `yyerrlab2' defined but not used test.c:2: warning: label `yyerrlab1' defined but not used Expected results: Either g++ should support __attribute__ in the same way as gcc, or yacc.c should take account of the different behavior. Additional info: g++296 fails in the same way. Problem does not occur with bison-1.35-4, from RH8.0, which had bison.simple instead of yacc.c.