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Enable C99 explicitly with CMake where available
This enables compilation as C99 where supported by the compiler. A workaround with per-compiler hardcoded flags is used for CMake 3.0, which does not support the C_STANDARD target property. Fixes #1560. Closes #1576.
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@ -100,6 +100,16 @@ set_target_properties(glfw PROPERTIES
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POSITION_INDEPENDENT_CODE ON
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FOLDER "GLFW3")
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if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.1.0")
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set_target_properties(glfw PROPERTIES C_STANDARD 99)
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else()
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# Remove this fallback when removing support for CMake version less than 3.1
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target_compile_options(glfw PRIVATE
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"$<$<C_COMPILER_ID:AppleClang>:-std=c99>"
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"$<$<C_COMPILER_ID:Clang>:-std=c99>>"
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"$<$<C_COMPILER_ID:GNU>:-std=c99>>")
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endif()
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target_compile_definitions(glfw PRIVATE _GLFW_USE_CONFIG_H)
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target_include_directories(glfw PUBLIC
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"$<BUILD_INTERFACE:${GLFW_SOURCE_DIR}/include>"
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