[LLVMdev] r102300 breaks Obj-C codegen on Darwin x86

[Jean-Daniel Dupas]

After commit 102300, any obj-c software compiled with clang crashes at launch time with the following stack trace.
Reverting this specific commit fix the issue.

------------------------------------------------------------------------------------------------
Date/Time:       2010-04-26 10:07:01.630 +0200
OS Version:      Mac OS X 10.6.3 (10D573)
Report Version:  6

Interval Since Last Report:          333376 sec
Crashes Since Last Report:           5
Per-App Crashes Since Last Report:   1
Anonymous UUID:                      C67EBC9D-4A73-4DA7-B067-E5006618C178

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000074696e55
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib               	0x913d3348 _objc_search_builtins + 299
1   libobjc.A.dylib               	0x913d313e __sel_registerName + 44
2   libobjc.A.dylib               	0x913d6269 map_method_descs + 47
3   libobjc.A.dylib               	0x913d4094 _read_images + 2116
4   libobjc.A.dylib               	0x913e9933 map_images_nolock + 1545
5   libobjc.A.dylib               	0x913d30d9 map_images + 72
6   dyld                          	0x8fe03ecc dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*)) + 698
7   dyld                          	0x8fe04359 dyld::registerImageStateBatchChangeHandler(dyld_image_states, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*)) + 452
8   libSystem.B.dylib             	0x958d3892 dyld_register_image_state_change_handler + 98
9   libobjc.A.dylib               	0x913d306d _objc_init + 77
10  dyld                          	0x8fe0ed6d ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) + 235
11  dyld                          	0x8fe0d31e ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int) + 246
12  dyld                          	0x8fe0d2c2 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int) + 154
13  dyld                          	0x8fe0d2c2 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int) + 154
14  dyld                          	0x8fe0d2c2 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int) + 154
15  dyld                          	0x8fe0d3d1 ImageLoader::runInitializers(ImageLoader::LinkContext const&) + 61
16  dyld                          	0x8fe024a9 dyld::initializeMainExecutable() + 134
17  dyld                          	0x8fe07950 dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**) + 4189
18  dyld                          	0x8fe018b1 dyldbootstrap::start(macho_header const*, int, char const**, long) + 779
19  dyld                          	0x8fe01057 _dyld_start + 39



-- Jean-Daniel