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doc: Update OpenBSD build instructions for 6.2

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There is no more need to install a compiler. This simplifies
instructions a lot.
This commit is contained in:
Wladimir J. van der Laan 2017-12-22 09:44:32 +01:00
parent 180a25596a
commit 6915f93cc9
1 changed files with 33 additions and 39 deletions
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72
doc/build-openbsd.md
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@ -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
```