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Merge #11984: doc: Update OpenBSD build instructions for 6.2 (cont'd)

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6915f93 doc: Update OpenBSD build instructions for 6.2 (Wladimir J. van der Laan)

Pull request description:

  (this continues #11442)
  There is no more need to install a new compiler. This simplifies instructions a lot.

  From discussion with @fanquake on IRC I first wanted to add a new section for 6.2, but that made the document a complex mess. I think it's good enough (and more maintainable too) to only support the most recent release.

  Includes #11976.

  I moved the "resource limits" section to the end as I didn't seem to need it with clang, but this may vary based on source changes and the phase of the moon so it's good to keep it as optional extra information.

Tree-SHA512: 15794afec6d682323d0aa13c7616d009acb7fce8b0ef5d2106261f2ebd86b7b2fe66040c04860d9bf2f0c1934fbdc2b594b8c09a98accfaac04f3daf9a6cadf3
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Wladimir J. van der Laan 2017-12-30 10:35:27 +01:00
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72
doc/build-openbsd.md
View file

@ -23,47 +23,31 @@ git clone https://github.com/bitcoin/bitcoin.git
See [dependencies.md](dependencies.md) for a complete overview.
GCC
-------
The default C++ compiler that comes with OpenBSD 6.2 is g++ 4.2.1. This version is old (from 2007), and is not able to compile the current version of Bitcoin Core because it has no C++11 support. We'll install a newer version of GCC:
```bash
pkg_add g++
```
This compiler will not overwrite the system compiler, it will be installed as `egcc` and `eg++` in `/usr/local/bin`.
**Important**: From OpenBSD 6.2 onwards a C++11-supporting clang compiler is
part of the base image, and while building it is necessary to make sure that this
compiler is used and not ancient g++ 4.2.1. This is done by appending
`CC=cc CXX=c++` to configuration commands. Mixing different compilers
within the same executable will result in linker errors.
### Building BerkeleyDB
BerkeleyDB is only necessary for the wallet functionality. To skip this, pass `--disable-wallet` to `./configure`.
BerkeleyDB is only necessary for the wallet functionality. To skip this, pass
`--disable-wallet` to `./configure` and skip to the next section.
It is recommended to use Berkeley DB 4.8. You cannot use the BerkeleyDB library
from ports, for the same reason as boost above (g++/libstd++ incompatibility).
If you have to build it yourself, you can use [the installation script included
in contrib/](contrib/install_db4.sh) like so
in contrib/](/contrib/install_db4.sh) like so
```shell
./contrib/install_db4.sh `pwd` CC=egcc CXX=eg++ CPP=ecpp
./contrib/install_db4.sh `pwd` CC=cc CXX=c++
```
from the root of the repository.
from the root of the repository. Then set `BDB_PREFIX` for the next section:
### Resource limits
The standard ulimit restrictions in OpenBSD are very strict:
data(kbytes) 1572864
This, unfortunately, may no longer be enough to compile some `.cpp` files in the project,
at least with GCC 4.9.4 (see issue [#6658](https://github.com/bitcoin/bitcoin/issues/6658)).
If your user is in the `staff` group the limit can be raised with:
ulimit -d 3000000
The change will only affect the current shell and processes spawned by it. To
make the change system-wide, change `datasize-cur` and `datasize-max` in
`/etc/login.conf`, and reboot.
```shell
export BDB_PREFIX="$PWD/db4"
```
### Building Bitcoin Core
@ -79,13 +63,13 @@ Make sure `BDB_PREFIX` is set to the appropriate path from the above steps.
To configure with wallet:
```bash
./configure --with-gui=no CC=egcc CXX=eg++ CPP=ecpp \
./configure --with-gui=no CC=cc CXX=c++ \
BDB_LIBS="-L${BDB_PREFIX}/lib -ldb_cxx-4.8" BDB_CFLAGS="-I${BDB_PREFIX}/include"
```
To configure without wallet:
```bash
./configure --disable-wallet --with-gui=no CC=egcc CXX=eg++ CPP=ecpp
./configure --disable-wallet --with-gui=no CC=cc CXX=c++
```
Build and run the tests:
@ -94,13 +78,23 @@ gmake # use -jX here for parallelism
gmake check
```
Clang
------------------------------
Resource limits
-------------------
```bash
pkg_add llvm
If the build runs into out-of-memory errors, the instructions in this section
might help.
The standard ulimit restrictions in OpenBSD are very strict:
data(kbytes) 1572864
This, unfortunately, in some cases not enough to compile some `.cpp` files in the project,
(see issue [#6658](https://github.com/bitcoin/bitcoin/issues/6658)).
If your user is in the `staff` group the limit can be raised with:
ulimit -d 3000000
The change will only affect the current shell and processes spawned by it. To
make the change system-wide, change `datasize-cur` and `datasize-max` in
`/etc/login.conf`, and reboot.
./configure --disable-wallet --with-gui=no CC=clang CXX=clang++
gmake # use -jX here for parallelism
gmake check
```