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SWIG 4.4 has dropped the usage of SWIG_NULLPTR again, which means we can't rely on its presence to identify SWIG >= 4.2.0 Generate a swig_version.h by parsing the output of `swig -version` and writing this in a hex representation Fixes #1979
54 lines
1.5 KiB
CMake
54 lines
1.5 KiB
CMake
# generate_swig_version.cmake
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execute_process(
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COMMAND ${SWIG_EXECUTABLE} -version
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OUTPUT_VARIABLE SWIG_OUTPUT
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ERROR_VARIABLE SWIG_ERROR
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OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_STRIP_TRAILING_WHITESPACE
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)
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set(FULL_OUTPUT "${SWIG_OUTPUT}\n${SWIG_ERROR}")
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string(REGEX MATCH "SWIG Version ([0-9]+)\\.([0-9]+)\\.([0-9]+)" MATCH_FOUND "${FULL_OUTPUT}")
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if(MATCH_FOUND)
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# Extract capture groups
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set(SWIG_VERSION_MAJOR ${CMAKE_MATCH_1})
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set(SWIG_VERSION_MINOR ${CMAKE_MATCH_2})
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set(SWIG_VERSION_PATCH ${CMAKE_MATCH_3})
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message(STATUS "Found SWIG Version: ${SWIG_VERSION_MAJOR}.${SWIG_VERSION_MINOR}.${SWIG_VERSION_PATCH}")
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# Format: 0x<MAJ><MIN><PATCH> (assuming 8 bits per component)
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# Calculation: (Major << 16) | (Minor << 8) | Patch
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math(EXPR VERSION_NUM
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"(${SWIG_VERSION_MAJOR} << 16) + (${SWIG_VERSION_MINOR} << 8) + ${SWIG_VERSION_PATCH}"
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OUTPUT_FORMAT HEXADECIMAL
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)
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set(HEADER_FILE "swig_version.h")
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file(WRITE ${SWIG_VERSION_HEADER}
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"// Auto-generated by CMake
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#ifndef SWIG_VERSION_META_H
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#define SWIG_VERSION_META_H
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#define SWIG_VERSION_MAJOR ${SWIG_VERSION_MAJOR}
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#define SWIG_VERSION_MINOR ${SWIG_VERSION_MINOR}
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#define SWIG_VERSION_PATCH ${SWIG_VERSION_PATCH}
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// Hex format 0xMAJMINPAT (e.g. 4.1.0 -> 0x40100)
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#define SWIG_VERSION ${VERSION_NUM}
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#endif // SWIG_VERSION_META_H
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"
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)
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message(STATUS "Generated ${HEADER_FILE} with version ${VERSION_NUM}")
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else()
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message(WARNING "Could not parse SWIG version from output:\n${FULL_OUTPUT}")
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endif()
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