cmake: fix searching Clang RT #9
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luzer module requires linking with a library
`clang_rt.fuzzer_no_main-x86_64` that is a part of a Clang runtime.
Without linking with it Lua runtime will report an error right on
loading `luzer.so`:
lua5.1: error loading module 'luzer' from file './luzer.so':
./luzer.so: undefined symbol: __sanitizer_cov_8bit_counters_init
The patch adds a module that composes a path to Clang runtime libraries
and adds this path to a library search paths. I suppose in some cases
introduced CMake function may fail. One can pass a path to a directory
with Clang RT manually using environment variable CLANG_RT_LIB_DIR.
In a usual case symbol __sanitizer_cov_8bit_counters_init is added by
compiler on instrumentation when compiler option
-fsanitize-coverage=inline-8bit-counters is specified [1].
1. https://clang.llvm.org/docs/SanitizerCoverage.html
Lua 5.1 has no support of `luaL_traceback` function. Previously, it was implemented using Lua function `debug.traceback` and this leads to recursive calls and finished with stack overflow. The patch backports implementation of `luaL_traceback` from a late Lua versions.
We cannot use `luaL_error` if Lua state is not initialized.
Enable Lua debug hook right before calling `TestOneInput` function and disable it right after returning from `TestOneInput`.
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Related to #18
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