https://llvm.org/bugs/show_bug.cgi?id=23604
Bug ID: 23604
Summary: Warning when -fsanitize-coverage= is followed by
-fno-sanitize=all
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
If sanitizers are turned off using -fno-sanitize=all, but -fsanitize-coverage=
flags were specified, we get a warning about an unused argument:
% clang++ -fsanitize=address,undefined
-fsanitize-coverage=edge,indirect-calls,8bit-counters,trace-cmp
-fno-sanitize=all -x c++ -c /dev/null -o /dev/null
clang-3.7: warning: argument unused during compilation:
'-fsanitize-coverage=edge,indirect-calls,8bit-counters,trace-cmp'
This is poor behaviour since the -fsanitize-coverage flag was valid where it
was used, and it makes it difficult to disable sanitizers in a makefile using
-fno-sanitize=all.
You'll hit this issue if you build llvm using a cmake invocation including
"-DLLVM_USE_SANITIZER=Address;Undefined -DLLVM_USE_SANITIZE_COVERAGE=ON
-DLLVM_ENABLE_WERROR=ON".
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