Jacob Garber uploaded patch set #4 to this change.
[TEST] Add support for link time optimization
- Code generation is not done until after linking, so the
compiler must be invoked at all linking stages instead of the linker. As
a consequence all linker arguments must be prefixed with -Wl.
- Partial linking is not supported. Instead, object files are collected
into thin archives that are linked instead.
- Wrapping libgcc functions causes a symbol mismatch when using LTO.
Wrapping these functions was originally done to support alternate
regparam values, though AFAICT this isn't used anywhere.
Using LTO leads to a ~10% decrease in stage size for QEMU and ~18% for
the Thinkpad T500, and both targets boot successfully.
Signed-off-by: Jacob Garber <email@example.com>
12 files changed, 61 insertions(+), 44 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/89/38989/4
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