49 lines
2.9 KiB
CMake
49 lines
2.9 KiB
CMake
# The hot-reload runtime is infrastructure the host application links
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# against directly. Unlike the plugins it loads at runtime (see
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# source/examples/HotReloadDemo), this library is never itself meant
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# to be hot-reloaded, so TYPE STATIC is a deliberate choice here,
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# independent of the project-wide BUILD_SHARED_LIBS default.
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add_lib_module(hotreload_lib TYPE STATIC OUTPUT_NAME "hotreload")
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# hot_reload::Context (Context.cpp) uses std::shared_mutex internally for its thread-safety
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# guarantee (see Context.hpp's own doc comment), and the MSVC branch of Demangle.cpp uses
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# std::mutex to serialize calls into DbgHelp. Both need pthread linked explicitly on Linux with
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# glibc older than 2.34 (newer glibc merged libpthread into libc itself, making this a no-op
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# there rather than a requirement) -- Threads::Threads is CMake's own portable way to ask for
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# whatever that platform actually needs. PUBLIC for the same reason as CMAKE_DL_LIBS below: for a
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# STATIC library this needs to reach whatever executable ultimately links hotreload_lib.
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find_package(Threads REQUIRED)
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target_link_libraries(hotreload_lib PUBLIC Threads::Threads)
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if(NOT WIN32)
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# dlopen/dlclose/dlinfo (ModuleHandle.cpp). PUBLIC, not PRIVATE:
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# for a STATIC library this needs to reach whatever executable
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# ultimately links hotreload_lib, not just hotreload_lib's own
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# (nonexistent, for a static lib) link step.
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target_link_libraries(hotreload_lib PUBLIC ${CMAKE_DL_LIBS})
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endif()
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# Two different questions, easy to conflate: "does this compiler take
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# MSVC-style command-line syntax" (the MSVC variable: real cl.exe and
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# clang-cl only) versus "does it produce MSVC-ABI output -- MSVC name
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# mangling, the Microsoft CRT, DbgHelp as its demangler" (also true of a
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# GNU-style clang++ pointed at the MSVC target, which is what a plain
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# Windows LLVM install gives you: no /W4-style flags, but still MSVC
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# mangling). This condition is the second question, and CMake derives
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# CMAKE_CXX_SIMULATE_ID from whether the compiler defines _MSC_VER --
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# the very macro Demangle.cpp's own #if keys on, so the two stay in
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# agreement by construction rather than by someone remembering to update
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# both. (cmake/BuildHelpers.cmake's /W4 and the root CMakeLists.txt's
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# /MP /EHsc are the first question, correctly keyed on MSVC alone.)
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if(MSVC OR CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC")
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# UnDecorateSymbolName (Demangle.cpp) lives in dbghelp.lib, which --
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# unlike kernel32/user32 -- MSVC does not link by default. Without
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# this, the final link fails with an undefined symbol for it;
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# found via an actual Windows build of this library, not just
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# documentation. PUBLIC for the same reason as CMAKE_DL_LIBS above.
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# Guarded on the MSVC ABI rather than WIN32, since MinGW's build of
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# Demangle.cpp takes the __GNUC__/__cxa_demangle branch instead and
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# never needs dbghelp at all.
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target_link_libraries(hotreload_lib PUBLIC dbghelp)
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endif()
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