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Merge #12692: Add configure options for various -fsanitize flags

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6feb46c Add --with-sanitizers option to configure (Evan Klitzke)

Pull request description:

  This adds configure options for `-fsanitize=address`, `-fsanitize=thread`, and `-fsanitize=undefined` which are all disabled by default. These flags are useful for developers who wish to do additional safety checking. Note that some of these are mutually incompatible, and these may have a large performance overhead.

  There's some kind of strange logic required to properly check for the availability of these flags in a way that works on both GCC and Clang, hopefully the comments make it clear what's going on.

Tree-SHA512: 2d6fe402799110e59ee452dddf37f7ca2d26a7fecec50be25c8a134e4a20beb31f1e8f438dffd443641562418075896d1eeb450623425b272d80e05e3027a587
This commit is contained in:
Wladimir J. van der Laan
2018-03-29 22:57:09 +02:00
parent 252c1b0fae 6feb46c372
commit de6bdfd78f
3 changed files with 81 additions and 2 deletions
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51
doc/developer-notes.md
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@ -243,6 +243,57 @@ make cov
# A coverage report will now be accessible at `./test_bitcoin.coverage/index.html`.
```
**Sanitizers**
Bitcoin can be compiled with various "sanitizers" enabled, which add
instrumentation for issues regarding things like memory safety, thread race
conditions, or undefined behavior. This is controlled with the
`--with-sanitizers` configure flag, which should be a comma separated list of
sanitizers to enable. The sanitizer list should correspond to supported
`-fsanitize=` options in your compiler. These sanitizers have runtime overhead,
so they are most useful when testing changes or producing debugging builds.
Some examples:
```bash
# Enable both the address sanitizer and the undefined behavior sanitizer
./configure --with-sanitizers=address,undefined
# Enable the thread sanitizer
./configure --with-sanitizers=thread
```
If you are compiling with GCC you will typically need to install corresponding
"san" libraries to actually compile with these flags, e.g. libasan for the
address sanitizer, libtsan for the thread sanitizer, and libubsan for the
undefined sanitizer. If you are missing required libraries, the configure script
will fail with a linker error when testing the sanitizer flags.
The test suite should pass cleanly with the `thread` and `undefined` sanitizers,
but there are a number of known problems when using the `address` sanitizer. The
address sanitizer is known to fail in
[sha256_sse4::Transform](/src/crypto/sha256_sse4.cpp) which makes it unusable
unless you also use `--disable-asm` when running configure. We would like to fix
sanitizer issues, so please send pull requests if you can fix any errors found
by the address sanitizer (or any other sanitizer).
Not all sanitizer options can be enabled at the same time, e.g. trying to build
with `--with-sanitizers=address,thread` will fail in the configure script as
these sanitizers are mutually incompatible. Refer to your compiler manual to
learn more about these options and which sanitizers are supported by your
compiler.
Additional resources:
* [AddressSanitizer](https://clang.llvm.org/docs/AddressSanitizer.html)
* [LeakSanitizer](https://clang.llvm.org/docs/LeakSanitizer.html)
* [MemorySanitizer](https://clang.llvm.org/docs/MemorySanitizer.html)
* [ThreadSanitizer](https://clang.llvm.org/docs/ThreadSanitizer.html)
* [UndefinedBehaviorSanitizer](https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html)
* [GCC Instrumentation Options](https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html)
* [Google Sanitizers Wiki](https://github.com/google/sanitizers/wiki)
* [Issue #12691: Enable -fsanitize flags in Travis](https://github.com/bitcoin/bitcoin/issues/12691)
Locking/mutex usage notes
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