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Update SanitizerCoverage doc regarding the issue with pc-table and gc-sections. 

Summary:
There is a bug for this: https://bugs.llvm.org/show_bug.cgi?id=34636
But it would be also helpful to leave a note in the docs to prevent users from
running into issues, e.g. https://crbug.com/926588.

Reviewers: morehouse

Reviewed By: morehouse

Subscribers: cfe-commits, llvm-commits, kcc

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57474

llvm-svn: 352890
This commit is contained in:
Max Moroz 2019-02-01 17:12:35 +00:00
parent 58513b7761
commit 123883807d
1 changed files with 5 additions and 0 deletions
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clang/docs/SanitizerCoverage.rst
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@ -144,6 +144,11 @@ PC-Table
**Experimental, may change or disappear in future**
**Note:** this instrumentation might be incompatible with dead code stripping
(``-Wl,-gc-sections``) for linkers other than LLD, thus resulting in a
significant binary size overhead. For more information, see
`Bug 34636 <https://bugs.llvm.org/show_bug.cgi?id=34636>`_.
With ``-fsanitize-coverage=pc-table`` the compiler will create a table of
instrumented PCs. Requires either ``-fsanitize-coverage=inline-8bit-counters`` or
``-fsanitize-coverage=trace-pc-guard``.