Frederic Riss 52e45a3b66 Reapply r246012 [dsymutil] Emit real dSYM companion binaries. ...

With a fix for big endian machines. Thanks to Daniel Sanders for the debugging!

Original commit message:

The binaries containing the linked DWARF generated by dsymutil are not
standard relocatable object files like emitted did previsously. They should be
dSYM companion files, which means they have a different file type in the
header, but also a couple other peculiarities:
 - they contain the segments and sections from the original binary in their
load commands, but not the actual contents. This means they get an address
and a size, but their offset is always 0 (but these are not virtual sections)
 - they also conatin all the defined symbols from the original binary

This makes MC a really bad fit to emit these kind of binaries. The approach
that was used in this patch is to leverage MC's section layout for the
debug sections, but to use a replacement for MachObjectWriter that lives
in MachOUtils.cpp. Some of the low-level helpers from MachObjectWriter
were reused too.

llvm-svn: 246673

2015-09-02 16:49:13 +00:00

8.9 KiB

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