Since c60a49d the logic for sonic is as follows:
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if (SONIC_LIB AND SONIC_INC) |
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set(HAVE_LIBSONIC ON) |
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else() |
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FetchContent_Declare(sonic-git |
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GIT_REPOSITORY https://github.com/waywardgeek/sonic.git |
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GIT_TAG fbf75c3d6d846bad3bb3d456cbc5d07d9fd8c104 |
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) |
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FetchContent_MakeAvailable(sonic-git) |
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FetchContent_GetProperties(sonic-git) |
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add_library(sonic OBJECT ${sonic-git_SOURCE_DIR}/sonic.c) |
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# enable PIC in order to embed libsonic.a in a .so |
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set_property(TARGET sonic PROPERTY POSITION_INDEPENDENT_CODE ON) |
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target_include_directories(sonic PUBLIC ${sonic-git_SOURCE_DIR}) |
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set(HAVE_LIBSONIC ON) |
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set(SONIC_LIB sonic) |
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set(SONIC_INC ${sonic-git_SOURCE_DIR}) |
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endif() |
That means if we don't provide a libsonic then cmake will try to clone their git repo and include it in the build process.
The dependencies listed in the building guide also imply that it should be optional, although it mostly seems to document the autoconf build system.