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127 lines
5.4 KiB
Markdown
127 lines
5.4 KiB
Markdown
# Overlay triplets example
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## Building dynamic libraries on Linux
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Using **vcpkg** you can build libraries for many configurations out of the box. However, this doesn't currently include shared libraries on Linux and Mac OS.
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This doesn't mean that you cannot use **vcpkg** to build your dynamic libraries on these platforms! This document will guide you through creating your own custom triplets with `--overlay-triplets` to easily build dynamic libraries on Linux.
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### Step 1: Create the custom triplet files
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To save time, copy the existing `x64-linux.cmake` triplet file.
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```sh
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~/git$ mkdir custom-triplets
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~/git$ cp vcpkg/triplets/x64-linux.cmake custom-triplets/x64-linux-dynamic.cmake
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```
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And modify `custom-triplets/x64-linux-dynamic.cmake` to match the contents below:
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```cmake
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# ~/git/custom-triplets/x64-linux-dynamic.cmake
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set(VCPKG_TARGET_ARCHITECTURE x64)
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set(VCPKG_CRT_LINKAGE dynamic)
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set(VCPKG_LIBRARY_LINKAGE dynamic) # This changed from static to dynamic
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set(VCPKG_CMAKE_SYSTEM_NAME Linux)
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```
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### Step 2: Use `--overlay-triplets` to build dynamic libraries
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Use the `--overlay-triplets` option to include the triplets in the `custom-triplets` directory.
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```
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~/git$ vcpkg/vcpkg install sqlite3:x64-linux-dynamic --overlay-triplets=custom-triplets
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The following packages will be built and installed:
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sqlite3[core]:x64-linux-dynamic
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Starting package 1/1: sqlite3:x64-linux-dynamic
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Building package sqlite3[core]:x64-linux-dynamic...
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-- Loading triplet configuration from: /home/victor/git/custom-triplets/x64-linux-dynamic.cmake
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-- Downloading https://sqlite.org/2019/sqlite-amalgamation-3280000.zip...
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-- Extracting source /home/victor/git/vcpkg/downloads/sqlite-amalgamation-3280000.zip
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-- Applying patch fix-arm-uwp.patch
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-- Using source at /home/victor/git/vcpkg/buildtrees/sqlite3/src/3280000-6a3ff7ce92
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-- Configuring x64-linux-dynamic-dbg
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-- Configuring x64-linux-dynamic-rel
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-- Building x64-linux-dynamic-dbg
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-- Building x64-linux-dynamic-rel
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-- Performing post-build validation
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-- Performing post-build validation done
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Building package sqlite3[core]:x64-linux-dynamic... done
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Installing package sqlite3[core]:x64-linux-dynamic...
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Installing package sqlite3[core]:x64-linux-dynamic... done
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Elapsed time for package sqlite3:x64-linux-dynamic: 44.82 s
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Total elapsed time: 44.82 s
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The package sqlite3:x64-linux-dynamic provides CMake targets:
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find_package(sqlite3 CONFIG REQUIRED)
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target_link_libraries(main PRIVATE sqlite3)
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```
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Overlay triplets enables your custom triplet files when using `vcpkg install`, `vcpkg update`, `vcpkg upgrade`, and `vcpkg remove`.
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When using the `--overlay-triplets` option, a message like the following lets you know that a custom triplet is being used:
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```
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-- Loading triplet configuration from: /home/custom-triplets/x64-linux-dynamic.cmake
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```
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## Overriding default triplets
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As you may have noticed, the default triplets for Windows (`x86-windows` and `x64-windows`) install dynamic libraries, while a suffix (`-static`) is needed for static libraries. This is different with Linux and Mac OS where static libraries are built by `x64-linux` and `x64-osx`.
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Using `--overlay-triplets` it is possible to override the default triplets to accomplish the same behavior on Linux:
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* `x64-linux`: Builds dynamic libraries,
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* `x64-linux-static`: Builds static libraries.
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### Step 1: Create the overlay triplets
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Using the custom triplet created in the previous example, rename `custom-triplets/x64-linux-dynamic.cmake` to `custom-triplets/x64-linux.cmake`. Then, copy the default `x64-linux` triplet (which builds static libraries) in your `custom-triplets` folder and rename it to `x64-linux-static.cmake`.
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```sh
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~/git$ mv custom-triplets/x64-linux-dynamic.cmake custom-triplets/x64-linux.cmake
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~/git$ cp vcpkg/triplets/x64-linux.cmake custom-triplets/x64-linux-static.cmake
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```
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### Step 2: Use `--overlay-triplets` to override default triplets
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Use the `--overlay-triplets` option to include the triplets in the `custom-triplets` directory.
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```
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~/git$ vcpkg/vcpkg install sqlite3:x64-linux --overlay-triplets=custom-triplets
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The following packages will be built and installed:
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sqlite3[core]:x64-linux
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Starting package 1/1: sqlite3:x64-linux
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Building package sqlite3[core]:x64-linux...
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-- Loading triplet configuration from: /home/victor/git/custom-triplets/x64-linux.cmake
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-- Downloading https://sqlite.org/2019/sqlite-amalgamation-3280000.zip...
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-- Extracting source /home/victor/git/vcpkg/downloads/sqlite-amalgamation-3280000.zip
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-- Applying patch fix-arm-uwp.patch
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-- Using source at /home/victor/git/vcpkg/buildtrees/sqlite3/src/3280000-6a3ff7ce92
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-- Configuring x64-linux-dbg
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-- Configuring x64-linux-rel
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-- Building x64-linux-dbg
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-- Building x64-linux-rel
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-- Performing post-build validation
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-- Performing post-build validation done
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Building package sqlite3[core]:x64-linux... done
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Installing package sqlite3[core]:x64-linux...
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Installing package sqlite3[core]:x64-linux... done
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Elapsed time for package sqlite3:x64-linux: 44.82 s
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Total elapsed time: 44.82 s
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The package sqlite3:x64-linux provides CMake targets:
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find_package(sqlite3 CONFIG REQUIRED)
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target_link_libraries(main PRIVATE sqlite3)
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```
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Note that the default triplet is masked by your custom triplet:
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```
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-- Loading triplet configuration from: /home/victor/git/custom-triplets/x64-linux.cmake
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```
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