The compiler emits the series of warnings like GSCategories.m:50: warning: '_OBJC_INSTANCE_0' defined but not used [...] when it sees the construct @"string". According to Anrew Pinski (pinskia@physics.uc.edu) this is a compiler bug
And I asked you to read http://gcc.gnu.org/bugs.html which means attaching the preprocessed source.
Created attachment 11378 [details] Test case Compilation made by: gcc -c -save-temps -m64 -mcpu=v9 NSArchiver.m -c \ -MMD -MP -I/usr/local/geneva/packages/include -DGNUSTEP_TARGET_DIR=\".\" -DGNUSTEP_TARGET_CPU=\"sparc\" -DGNUSTEP_TARGET_OS=\"solaris2.8\" -DGNUSTEP_FLATTENED=\"yes\" -DLIBRARY_COMBO=\"gnu-gnu-gnu\" -Wall -Wno-char-subscripts -DGNUSTEP -DGNUSTEP_BASE_LIBRARY=1 -DGNU_RUNTIME=1 -DGNUSTEP_BASE_LIBRARY=1 -D_REENTRANT -fpic -fPIC -DGSWARN -DGSDIAGNOSE -g -O2 -fno-strict-aliasing -fgnu-runtime -fconstant-string-class=NSConstantString -I../Headers/Additions -I../Headers -I./. -I. -I/usr/local/geneva/packages/include -I/usr/local/geneva/packages/GNUstep/System/Library/Headers -I/usr/local/geneva/packages/GNUstep/System/Library/Headers -I/usr/local/geneva/packages/include/libxml2 -IGNUstep/Library/Headers -I/usr/local/geneva/packages/GNUstep/Local/Library/Headers -I/usr/local/geneva/packages/GNUstep/System/Library/Headers \ -o shared_obj/NSArchiver.o
Reducing.
Small testcase with the GNU runtime: @interface NXConstantString { void *isa; const char * const nxcsptr; const unsigned int nxcslen; } @end NXConstantString *a = @"NSInconsistentArchiveException";
(In reply to comment #4) > Small testcase with the GNU runtime: Note only -Wall -funit-at-a-time is enough to reproduce the bug.
P5: Objective-C is not release-critical.
Will not be fixed in 4.1.1; adjust target milestone to 4.1.2.
I have a simple fix.
Subject: Bug 27438 Author: pinskia Date: Wed Jan 24 06:01:09 2007 New Revision: 121102 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=121102 Log: 2007-01-23 Andrew Pinski <pinskia@gmail.com> PR objc/27438 * objc-act.c (objc_add_static_instance): Mark the decl as TREE_USED. 2007-01-23 Andrew Pinski <pinskia@gmail.com> PR objc/27438 * objc.dg/const-str-12.m: New test. Added: trunk/gcc/testsuite/objc.dg/const-str-12.m Modified: trunk/gcc/objc/ChangeLog trunk/gcc/objc/objc-act.c trunk/gcc/testsuite/ChangeLog
Subject: Bug 27438 Author: pinskia Date: Wed Jan 24 06:06:07 2007 New Revision: 121103 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=121103 Log: 2007-01-23 Andrew Pinski <pinskia@gmail.com> PR objc/27438 * objc-act.c (objc_add_static_instance): Mark the decl as TREE_USED. 2007-01-23 Andrew Pinski <pinskia@gmail.com> PR objc/27438 * objc.dg/const-str-12.m: New test. Added: branches/gcc-4_1-branch/gcc/testsuite/objc.dg/const-str-12.m - copied unchanged from r121102, trunk/gcc/testsuite/objc.dg/const-str-12.m Modified: branches/gcc-4_1-branch/gcc/objc/ChangeLog branches/gcc-4_1-branch/gcc/objc/objc-act.c branches/gcc-4_1-branch/gcc/testsuite/ChangeLog
Subject: Bug 27438 Author: pinskia Date: Wed Jan 24 06:06:29 2007 New Revision: 121104 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=121104 Log: 2007-01-23 Andrew Pinski <pinskia@gmail.com> PR objc/27438 * objc-act.c (objc_add_static_instance): Mark the decl as TREE_USED. 2007-01-23 Andrew Pinski <pinskia@gmail.com> PR objc/27438 * objc.dg/const-str-12.m: New test. Added: branches/gcc-4_2-branch/gcc/testsuite/objc.dg/const-str-12.m - copied unchanged from r121102, trunk/gcc/testsuite/objc.dg/const-str-12.m Modified: branches/gcc-4_2-branch/gcc/objc/ChangeLog branches/gcc-4_2-branch/gcc/objc/objc-act.c branches/gcc-4_2-branch/gcc/testsuite/ChangeLog
Fixed.