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Different versions of the linker behave differently when mixing object
built with lto enabled (desirable for code size reduction) and disabled
(assembler code), especially when they refer to each other symbols:
The file evaluation order of the linker becomes important as it
eliminates dead code at various points in time, and LTO code referring
to non-LTO code or vice versa, is not visible at early runs.
Sadly, just changing the order on the command line isn't sufficient:
What works for gcc8 breaks gcc6 (and may behave different in even more
ways on gcc4 or other versions).
Therefore, implement the vector table in C, so it's compiled in LTO
mode, just like the code it refers to.
This is a port of Change-Id: I9b75f6558f0357e18000ff1161096c8f9c94a8ac
BUG=b:65441143
BRANCH=none
TEST=with this change the vector table for whiskers looks much more
reasonable (ie. not mostly empty)
Change-Id: Ifd39289ecb16b81cdf41427ce190984510d3fd3c
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1120333
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Jonathan Brandmeyer <jbrandmeyer@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1177382
Reviewed-by: Jonathan Brandmeyer <jbrandmeyer@chromium.org>
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