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# Building Ice for C++ on OS X
This file describes the Ice source distribution, including information about
compiler requirements, third-party dependencies, and instructions for building
and testing the distribution. If you prefer, you can install a [Homebrew][1]
package instead.
## C++ Build Requirements
### Operating Systems and Compilers
Ice was extensively tested using the operating systems and compiler versions
listed for our [supported platforms][2].
### Third-Party Libraries
Ice has dependencies on a number of third-party libraries:
- [Berkeley DB][5] 5.3
- [bzip][4] 1.0
- [expat][3] 2.1
- [mcpp][6] 2.7.2 (with patches)
Expat and bzip are included with your system. For Berkeley DB and mcpp, you have
a couple of options:
- Using [Homebrew][7], install Berkeley DB and mcpp with these commands:
$ brew tap zeroc-ice/tap
$ brew install berkeley-db53 [--without-java]
$ brew install mcpp
The `berkeley-db53` package is a pre-compiled bottle that includes Java
support by default; you can exclude Java support using the `--without-java`
option.
- Download the Berkeley DB and mcpp source distributions and build them
yourself.
## Building Ice
In a command window, change to the `cpp` subdirectory:
$ cd cpp
Edit `config/Make.rules` to establish your build configuration. The comments in
the file provide more information. Pay particular attention to the variables
that define the locations of the third-party libraries.
Now you're ready to build Ice:
$ make
This will build the Ice core libraries, services, and tests.
## Installing a C++ Source Build
Simply run `make install`. This will install Ice in the directory specified by
the `prefix` variable in `config/Make.rules`.
After installation, make sure that the `<prefix>/bin` directory is in your
`PATH`.
If you choose to not embed a `runpath` into executables at build time (see your
build settings in `config/Make.rules`) or did not create a symbolic link from
the `runpath` directory to the installation directory, you also need to add the
library directory to your `DYLD_LIBRARY_PATH`.
When compiling Ice programs, you must pass the location of the
`<prefix>/include` directory to the compiler with the `-I` option, and the
location of the library directory with the `-L` option.
## Running the Test Suite
Python is required to run the test suite. Additionally, the Glacier2 tests
require the Python module `passlib`, which you can install with the command:
$ pip install passlib
After a successful source build, you can run the tests as follows:
$ make test
This command is equivalent to:
$ python allTests.py
If everything worked out, you should see lots of `ok` messages. In case of a
failure, the tests abort with `failed`.
[1]: https://doc.zeroc.com/display/Ice36/Using+the+OS+X+Binary+Distribution
[2]: https://doc.zeroc.com/display/Ice36/Supported+Platforms+for+Ice+3.6.3
[3]: http://expat.sourceforge.net
[4]: http://bzip.org
[5]: http://www.oracle.com/us/products/database/berkeley-db/overview/index.htm
[6]: https://github.com/zeroc-ice/mcpp
[7]: http://brew.sh
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