tree 35b6ec264579a42c601a3d4794be4be7db4a6604
parent 20043c305df7a8d86af029d37ab971a6ea18d14f
author Stephen Crane <sjc@immunant.com> 1605637436 -0800
committer Stephen Crane <sjc@immunant.com> 1607987179 -0800

[make] Force correct frame pointers for sancov

Accurate LLVM coverage instrumentation with trace-pc-guard requires
being able to correctly find a function's caller. With sibling call
optimization, calls at the end of a function are turned into a direct
branch to the sibling function, which causes the builtin returning our
caller in the instrumentation to return the wrong caller.

Disable sibling call optimization when building with coverage
instrumentation.

Bug: 175221942
Test: USER_COVERAGE_ENABLED=true build.py qemu-generic-arm64-fuzz-test-debug
Change-Id: I596ee3565a95d288f2633042ded9573ce0583915