7d1a3bda21
b155fcda51doc: fix typo in configure.ac (fanquake)20a30922fbdoc: note why we can't use thread_local with glibc back compat (fanquake) Pull request description: Given that we went through a [gitian build](https://github.com/bitcoin/bitcoin/pull/18681) to remember why this is the case, we might as well make a note of it in configure.ac. [From #18681](https://github.com/bitcoin/bitcoin/pull/18681#issuecomment-615526634): Looking at the Linux build log, this has failed with: ```bash Checking glibc back compat... bitcoind: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 bitcoind: failed IMPORTED_SYMBOLS bitcoin-cli: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 bitcoin-cli: failed IMPORTED_SYMBOLS bitcoin-tx: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 bitcoin-tx: failed IMPORTED_SYMBOLS bitcoin-wallet: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 bitcoin-wallet: failed IMPORTED_SYMBOLS test/test_bitcoin: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 test/test_bitcoin: failed IMPORTED_SYMBOLS bench/bench_bitcoin: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 bench/bench_bitcoin: failed IMPORTED_SYMBOLS qt/bitcoin-qt: symbol __cxa_thread_atexit_impl from unsupported version GLIBC_2.18 ``` `__cxa_thread_atexit_impl` is used for [thread_local variable destruction](https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables): > To implement this support, glibc defines __cxa_thread_atexit_impl exclusively for use by libstdc++ (which has the __cxa_thread_atexit to wrap around it), that registers destructors for thread_local variables in a list. Upon thread or process exit, the destructors are called in reverse order in which they were added. As suggested, this only became available in glibc 2.18. From the [2.18 release notes](https://sourceware.org/legacy-ml/libc-alpha/2013-08/msg00160.html): > * Add support for calling C++11 thread_local object destructors on thread and program exit. This needs compiler support for offloading C++11 destructor calls to glibc. ACKs for top commit: hebasto: ACKb155fcda51Tree-SHA512: 5b9567e4a70598a4b0b91956f44ae0d93091db17c84cbf9817dac6cfa992c97d3438a8b1bb66644c74891f2149e44984daed445d22de93ca8858c5b0eabefb40
Bitcoin Core integration/staging tree
What is Bitcoin?
Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.
For more information, as well as an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/, or read the original whitepaper.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.
Development Process
The master branch is regularly built and tested, but is not guaranteed to be
completely stable. Tags are created
regularly to indicate new official, stable release versions of Bitcoin Core.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled in configure) with: make check. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python, that are run automatically on the build server.
These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py
The Travis CI system makes sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.
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