-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Bruce Lilly wrote: > Hi, > > Earlier versions of gcc retain static character strings in object files > which can be used for identification via ident (RCS) or what (SCCS). > Gcc 4.0.0 removes them above optimization level 1. Global strings > are retained, of course, but that may lead to namespace collisions. > #ident doesn't work on some architectures, and functionality can't > be determined at preprocessor time. #sccs doesn't work at all. The > bottom line is that identification which worked with earlier versions > of gcc is broken under 4.0.0. See attached C source code example. > > > ------------------------------------------------------------------------ > > /* the following works with SCCS (what) and RCS et al (ident) with gcc 3.x and > earlier > string symbol is local (static) to object file and does not clash > with symbols similarly defined in other files in the same package > or in library archives used with a package > gcc 4.0.0 with optimization level 2 or greater elides the symbol and > string, > breaking identification; -fkeep-static-consts is ineffective with > optimization turned on > */ > static const char rcs_sccs_id[] = > "$Id: @(#)%M% %I% 20%E% %U% copyright 2005 %Q% string1\\ $";
Use static const char rcs_sccs_id[] __attribute__((used)) = ".." Sebastian -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iQEVAwUBQm2Md/81M8QtvOSJAQKPxgf+N6Q6iKedLaWOwrYRcC2rrDo2/iqDTc36 aIlIJQN5I41T8JRt0R0T5vnxRdTGx6v2VIpYf6Xw/wMigbA22ANUhp/r6DnYaJS0 ieKzyEf4BPlL3xuMfhIU7UzUI3ogzF8lsFhiAgtvm/1bu1IeFIUevlyfj57ZfV7H 2Vl3CuQ8SFLBLj+k6FJV1svcCnzo52msvBggZwvLRd9CizpDaJ41cyeH+StFNaXo BQRQYnsoZhbhvCFGSCmHOKdaMB10XE1R6QNL86f/YYEDrX/slY4Kxc1pr4heBC/M FLY1hnj1+MPK0Ch5HyAzLlMNDBG9gUR8MvY9UCIEXonpt6QspjWKXg== =jy0E -----END PGP SIGNATURE-----
