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# Build on Linux
_For Ubuntu based Linux distributions._
## Install Build Essential
```
sudo apt install build-essential
```
## Install CMake
Please refer to https://apt.kitware.com/.
## Install Zlib & OpenSSL
```
sudo apt install zlib1g-dev libssl-dev
```
## Install Boost
Download the `.tar.bz2` or `.tar.gz` from [here](https://www.boost.org/users/download/#live).
Unpack and go into the directory (suppose Boost version is 1.74):
```
tar -xzf boost_1_74_0.tar.gz
cd boost_1_74_0
```
Run `bootstrap.sh` to generate `b2`:
```
./bootstrap.sh
```
You can change install prefix with `--prefix` (default is `/usr/local`, need `sudo`), but I don't recommend.
Build and install:
```
sudo ./b2 --with-system --with-date_time --with-filesystem variant=debug link=static threading=multi -j4 install
```
Notes:
- Only build the specified libraries. `Asio` itself is header only so doesnt have to be built.
- Only build static libraries (`link=static`)
- The number after `-j` depends on the number of CPU cores you have.
- If you want to build release version libraries, set `variant=release`. The `debug` and `release` libraries have exactly the same name, so you cannot build them both at the same time.
- Dont forget the `sudo` since the install prefix is `/usr/local`.
To clean the build, run `b2` with target "clean":
```
./b2 clean
```
The libraries are installed to `/usr/local/lib`. E.g.,
```
$ ls -l /usr/local/lib/libboost*
-rw-r--r-- 1 adam admin 540288 Apr 21 11:01 /usr/local/lib/libboost_date_time.a
...
```
The headers are installed to `/usr/local/include/boost`.
## Build Webcc
Create a build folder under the root (or any other) directory, and `cd` to it:
```
mkdir build
cd build
```
Generate Makefiles with the following command:
```
cmake -G"Unix Makefiles" \
-DCMAKE_INSTALL_PREFIX=~ \
-DWEBCC_ENABLE_LOG=1 \
-DWEBCC_LOG_LEVEL=0 \
-DWEBCC_ENABLE_SSL=1 \
-DWEBCC_ENABLE_GZIP=1 \
-DWEBCC_ENABLE_AUTOTEST=OFF \
-DWEBCC_ENABLE_UNITTEST=OFF \
-DWEBCC_ENABLE_EXAMPLES=ON \
..
```
_NOTE: You can create a script (e.g., `gen.sh`) with the above command to avoid typing again and again whenever you want to change an option._
Feel free to change the build options according to your need.
CMake variable `CMAKE_INSTALL_PREFIX` defines where to install the output library and header files. The default is `/usr/local`. But this feature needs rework. I should come back to this later.
If everything is OK, you can then build with `make`:
```
make -j4
```
The number after `-j` depends on how many CPU cores you have. You can just ignore `-j` option.
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