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