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First step in fixing MC. Make it clear that we are avoiding a bug in the 

darwin9 linker, what is needed to avoid it and where to get more information.

Also make the workaround simpler. Just the regular end_sequence we normally
create is more than 4 bytes.

Tested by building cctools and ld64 from darwin9 on a darwin10 system and using
those. I checked that I was able to reproduce the bootstrap failure when
the the workaround was disabled.

llvm-svn: 120854
This commit is contained in:
Rafael Espindola 2010-12-03 23:36:59 +00:00
parent f0227ccf3f
commit f8af778e1f
1 changed files with 7 additions and 10 deletions
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17
llvm/lib/MC/MCDwarf.cpp
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@ -297,17 +297,14 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
}
if (TextSection && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) {
// Emit dummy entry if line table is empty.
// The darwin9 linker has a bug (see PR8715). For for 32-bit architectures
// it requires:
// total_length >= prologue_length + 10
// We are 4 bytes short, since we have total_length = 51 and
// prologue_length = 45
MCOS->SwitchSection(TextSection);
MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
// Set the value of the symbol, as we are at the end of the section.
MCOS->EmitLabel(SectionEnd);
// Switch back the the dwarf line section.
MCOS->SwitchSection(DwarfLineSection);
MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, NULL, SectionEnd);
// The regular end_sequence should be sufficient.
MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
}
// This is the end of the section, so set the value of the symbol at the end