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LTO: introduce object file-based on-disk module format.

Description

LTO: introduce object file-based on-disk module format.

This format is simply a regular object file with the bitcode stored in a
section named ".llvmbc", plus any number of other (non-allocated) sections.

One immediate use case for this is to accommodate compilation processes
which expect the object file to contain metadata in non-allocated sections,
such as the ".go_export" section used by some Go compilers [1], although I
imagine that in the future we could consider compiling parts of the module
(such as large non-inlinable functions) directly into the object file to
improve LTO efficiency.

[1] http://golang.org/doc/install/gccgo#Imports

Differential Revision: http://reviews.llvm.org/D4371

Details

Committed
pccSep 18 2014, 2:28 PM
Differential Revision
D4371: LTO: introduce object file-based on-disk module format.
Parents
rL218077: [PECOFF] /safeseh:no on x64 is not an error
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