The attached patch limits the linkage of -lcrt1.10.6.o to darwin10 and darwin11 since its usage is deprecated in the 10.8sdk. The patch also solves radr://11491405, "-pg broken for -mmacosx-version-min=10.8"...
19-May-2012 11:10 PM Jack Howarth: Summary: The default -mmacosx-version-min=10.8 under Xcode 4.4 breaks a number of FSF gcc tests which rely on -pg. such as... FAIL: gcc.dg/nest.c execution test FAIL: gcc.dg/nested-func-4.c execution test Steps to Reproduce: The attached compressed archive for xcodebug_pg_10.8.tar.bz2 contains the files from compiling these test cases with... gcc-fsf-4.7 /sw/src/fink.build/gcc47-4.7.1-1000/gcc-4.7-20120518/gcc/testsuite/gcc.dg/nest.c --save-temps -v -O2 -pg -lm -m32 -o ./nest.exe and gcc-fsf-4.7 /sw/src/fink.build/gcc47-4.7.1-1000/gcc-4.7-20120518/gcc/testsuite/gcc.dg/nested-func-4.c -v --save-temps -pg -lm -m32 -o ./nested-func-4.exe as well as shell scripts for bad_runs.sh and bad_runs2.sh to execute each of the miscompiled binaries against the bundled FSF gcc shared library for libgcc_s.1.dylib. Expected Results: The nest.exe and nested-func-4.exe test cases should execute without errors as they do when built with the -mmacosx-version-min=10.7 flag. Actual Results: In both cases, these test case fail with the error... dyld: no valid entry point The patch implements the recommended approach from the darwin linker developer of passing -no_new_main to the linker when targeting 10.8 or later which tells the linker to look for "start" instead of "_main". Otherwise the linker sets up _main as the entry point and _moninit is never called, resulting in a runtime error. Bootstrap and regression tested on x86_64-apple-darwin12. http://gcc.gnu.org/ml/gcc-testresults/2012-05/msg02331.html Okay for gcc trunk and later gcc-4_7-branch and gcc-4_6-branch? Jack 2012-05-24 Jack Howarth <howa...@bromo.med.uc.edu> * config/darwin.h (STARTFILE_SPEC): Use -no_new_main with -lgcrt1.o on Darwin >= 12. (DARWIN_CRT1_SPEC): Use -lcrt1.10.6.o when Darwin >= 10 and < 12. --- gcc/config/darwin.h (revision 187856) +++ gcc/config/darwin.h (working copy) @@ -356,7 +356,9 @@ extern GTY(()) int darwin_ms_struct; %{!Zbundle:%{pg:%{static:-lgcrt0.o} \ %{!static:%{object:-lgcrt0.o} \ %{!object:%{preload:-lgcrt0.o} \ - %{!preload:-lgcrt1.o %(darwin_crt2)}}}} \ + %{!preload:-lgcrt1.o \ + %:version-compare(>= 10.8 mmacosx-version-min= -no_new_main) \ + %(darwin_crt2)}}}} \ %{!pg:%{static:-lcrt0.o} \ %{!static:%{object:-lcrt0.o} \ %{!object:%{preload:-lcrt0.o} \ @@ -379,7 +381,7 @@ extern GTY(()) int darwin_ms_struct; #define DARWIN_CRT1_SPEC \ "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o) \ %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lcrt1.10.5.o) \ - %:version-compare(>= 10.6 mmacosx-version-min= -lcrt1.10.6.o) \ + %:version-compare(>< 10.6 10.8 mmacosx-version-min= -lcrt1.10.6.o) \ %{fgnu-tm: -lcrttms.o}" /* Default Darwin ASM_SPEC, very simple. */
