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CMake: Add detection of dependencies for building swig from source on linux
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‎cmake/modules/FindPCRE.cmake‎

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# CMake module to find PCRE headers & library
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#
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# Note:
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# This is for the older PCRE interface (i.e. not PCRE2). However this is named libpcre3 on ubuntu/debian...
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#
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# Usage:
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# find_package( PCRE )
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# if(PCRE_FOUND)
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# include_directories(${PCRE_INCLUDE_DIRS})
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# target_link_libraries(target ${PCRE_LIBRARIES})
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# endif()
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#
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# Variables:
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# PCRE_FOUND
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# PCRE_INCLUDE_DIRS
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# PCRE_LIBRARIES
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# PCRE_VERSION
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# PCRE_CONFIG
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# Search for pcre.h in standard include paths
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find_path(PCRE_INCLUDE_DIRS
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NAMES
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pcre.h
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)
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# Find the various pcre libraries
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find_library(PCRE_LIBRARY_8 NAMES pcre libpcre)
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find_library(PCRE_LIBRARY_16 NAMES pcre16 libpcre16 )
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find_library(PCRE_LIBRARY_32 NAMES pcre32 libpcre32 )
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find_library(PCRE_LIBRARY_POSIX NAMES pcreposix libpcreposix )
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# Combine found libraries into a single list (adjust based on what your project needs)
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set(PCRE_LIBRARIES)
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if (PCRE_LIBRARY_8)
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list(APPEND PCRE_LIBRARIES ${PCRE_LIBRARY_8})
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endif()
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if (PCRE_LIBRARY_16)
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list(APPEND PCRE_LIBRARIES ${PCRE_LIBRARY_16})
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endif()
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if (PCRE_LIBRARY_32)
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list(APPEND PCRE_LIBRARIES ${PCRE_LIBRARY_32})
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endif()
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if (PCRE_LIBRARY_POSIX)
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list(APPEND PCRE_LIBRARIES ${PCRE_LIBRARY_POSIX})
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endif()
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# Find pcre-config
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find_program(PCRE_CONFIG pcre-config)
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# Extract the version number, which is defiend separately as PCRE_MAJOR and PCRE_MINOR (and PCRE_PRERELEASE, but not checking the prerelease component)
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set(PCRE_VERSION "unknown")
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if (PCRE_INCLUDE_DIRS AND EXISTS "${PCRE_INCLUDE_DIRS}/pcre.h")
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file(READ "${PCRE_INCLUDE_DIRS}/pcre.h" pcre_header_text)
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string(REGEX MATCH "define PCRE_MAJOR +([0-9]+)" PCRE_MAJOR_DEFINE ${pcre_header_text})
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set(PCRE_MAJOR "${CMAKE_MATCH_1}")
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string(REGEX MATCH "define PCRE_MINOR +([0-9]+)" PCRE_MINOR_DEFINE ${pcre_header_text})
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set(PCRE_MINOR "${CMAKE_MATCH_1}")
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if (NOT "${PCRE_MAJOR_DEFINE}" STREQUAL "" AND NOT "${PCRE_MAJOR_DEFINE}" STREQUAL "")
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set(PCRE_VERSION "${PCRE_MAJOR}.${PCRE_MINOR}")
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endif()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(PCRE
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REQUIRED_VARS
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PCRE_LIBRARIES PCRE_INCLUDE_DIRS PCRE_CONFIG
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VERSION_VAR
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PCRE_VERSION
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)
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mark_as_advanced(PCRE_INCLUDE_DIRS PCRE_LIBRARY_8 PCRE_LIBRARY_16 PCRE_LIBRARY_32 PCRE_LIBRARY_POSIX PCRE_LIBRARIES PCRE_VERSION)
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# Unset temporary variables
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unset(PCRE_MAJOR)
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unset(PCRE_MINOR)
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# If we wanted to actually depend on pcre, we could create an imported library target here.
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# However there is no need currently as we are just checking for pcre presence to emit a warning if building swig from source and swig compilation failed.

‎cmake/modules/FindPCRE2.cmake‎

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# CMake module to find PCRE2 headers & library
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#
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# Usage:
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# find_package( PCRE2 )
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# if(PCRE2_FOUND)
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# include_directories(${PCRE2_INCLUDE_DIRS})
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# target_link_libraries(target ${PCRE2_LIBRARIES})
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# endif()
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#
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# Variables:
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# PCRE2_FOUND
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# PCRE2_INCLUDE_DIRS
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# PCRE2_LIBRARIES
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# PCRE2_VERSION
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# PCRE2_CONFIG
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# Search for pcre2.h in standard include paths
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find_path(PCRE2_INCLUDE_DIRS
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NAMES
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pcre2.h
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)
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# Find the various pcre libraries
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find_library(PCRE2_LIBRARY_8 NAMES pcre2-8 libpcre2-8)
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find_library(PCRE2_LIBRARY_16 NAMES pcre2-16 libpcre2-16 )
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find_library(PCRE2_LIBRARY_32 NAMES pcre2-32 libpcre2-32 )
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find_library(PCRE2_LIBRARY_POSIX NAMES pcre2-posix libpcre2-posix )
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# Combine found libraries into a single list (adjust based on what your project needs)
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set(PCRE2_LIBRARIES)
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if (PCRE2_LIBRARY_8)
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list(APPEND PCRE2_LIBRARIES ${PCRE2_LIBRARY_8})
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endif()
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if (PCRE2_LIBRARY_16)
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list(APPEND PCRE2_LIBRARIES ${PCRE2_LIBRARY_16})
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endif()
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if (PCRE2_LIBRARY_32)
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list(APPEND PCRE2_LIBRARIES ${PCRE2_LIBRARY_32})
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endif()
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if (PCRE2_LIBRARY_POSIX)
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list(APPEND PCRE2_LIBRARIES ${PCRE2_LIBRARY_POSIX})
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endif()
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# Find pcre2-config
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find_program(PCRE2_CONFIG pcre2-config)
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# Extract the version number, which is defiend separately as PCRE2_MAJOR and PCRE2_MINOR (and PCRE2_PRERELEASE, but not checking the prerelease component)
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if (PCRE2_INCLUDE_DIRS AND EXISTS "${PCRE2_INCLUDE_DIRS}/pcre2.h")
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file(READ "${PCRE2_INCLUDE_DIRS}/pcre2.h" pcre2_header_text)
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string(REGEX MATCH "define PCRE2_MAJOR +([0-9]+)" PCRE2_MAJOR_DEFINE ${pcre2_header_text})
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set(PCRE2_MAJOR "${CMAKE_MATCH_1}")
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string(REGEX MATCH "define PCRE2_MINOR +([0-9]+)" PCRE2_MINOR_DEFINE ${pcre2_header_text})
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set(PCRE2_MINOR "${CMAKE_MATCH_1}")
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if (NOT "${PCRE2_MAJOR_DEFINE}" STREQUAL "" AND NOT "${PCRE2_MAJOR_DEFINE}" STREQUAL "")
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set(PCRE2_VERSION "${PCRE2_MAJOR}.${PCRE2_MINOR}")
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else()
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set(PCRE2_VERSION "unknown")
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endif()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(PCRE2
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REQUIRED_VARS
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PCRE2_LIBRARIES PCRE2_INCLUDE_DIRS PCRE2_CONFIG
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VERSION_VAR
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PCRE2_VERSION
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)
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mark_as_advanced(PCRE2_INCLUDE_DIRS PCRE2_LIBRARY_8 PCRE2_LIBRARY_16 PCRE2_LIBRARY_32 PCRE2_LIBRARY_POSIX PCRE2_LIBRARIES PCRE2_VERSION)
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# Unset temporary variables
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unset(PCRE2_MAJOR)
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unset(PCRE2_MINOR)
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# If we wanted to actually depend on pcre2, we could create an imported library target here.
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# However there is no need currently as we are just checking for pcre2 presence to emit a warning if building swig from source and swig compilation failed.

‎swig/CMakeLists.txt‎

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@@ -23,6 +23,9 @@ if(POLICY CMP0135)
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cmake_policy(SET CMP0135 NEW)
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endif()
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# Ensure custom Find* modules are avialable
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set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/../cmake/modules/ ${CMAKE_MODULE_PATH})
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# Find Python3, optionally an exact version for windows CI, or use in manylinux
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if(PYTHON3_EXACT_VERSION)
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set(PYTHON3_EXACT_VERSION_ARG ${PYTHON3_EXACT_VERSION} EXACT)
@@ -113,6 +116,54 @@ if(NOT SWIG_FOUND)
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)
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FetchContent_GetProperties(swig)
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if(NOT swig_POPULATED)
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# Quitely Find PCRE (Swig < 4.1) or PCRE2 >= swig 4.1. If not found, emit a warning, but do not error (incase cmake/modules/FindPCRE.cmake is not perfect)
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if (FLAMEGPU_SWIG_DOWNLOAD VERSION_LESS "4.1")
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find_package(PCRE QUIET)
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message("a")
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if(NOT PCRE_FOUND)
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message(
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WARNING " Swig ${FLAMEGPU_SWIG_DOWNLOAD} requires 'pcre-config', but PCRE could not be found.\n"
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" Swig compilation from source may fail.\n"
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" If so, please insall PCRE with development dependencies, e.g.:\n"
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" - On DEB-based distributions (Debian, Ubuntu, etc): apt-get install libpcre3-dev\n"
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" - On RPM-based distributions (Fedora, RHEL, etc): dnf install libpcre-devel"
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)
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endif()
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else()
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find_package(PCRE2 QUIET)
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if(NOT PCRE2_FOUND)
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message(
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WARNING " Swig ${FLAMEGPU_SWIG_DOWNLOAD} requires 'pcre2-config', but PCRE could not be found.\n"
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" Swig compilation from source may fail.\n"
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" If so, please insall PCRE with development dependencies, e.g.:\n"
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" - On DEB-based distributions (Debian, Ubuntu, etc): apt-get install libpcre2-dev\n"
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" - On DNF-based distributions (Fedora, RHEL, etc): dnf install libpcre2-devel"
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)
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endif()
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endif()
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# Ensure that autotools/automake is available, as required to build swig from source.
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find_program(AUTOMAKE_EXECUTABLE NAMES automake)
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find_program(ACLOCAL_EXECUTABLE NAMES aclocal)
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if(NOT AUTOMAKE_EXECUTABLE OR NOT ACLOCAL_EXECUTABLE)
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message(
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FATAL_ERROR " Building Swig ${FLAMEGPU_SWIG_DOWNLOAD} from source requires automake, but it could not be found\n"
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" Please insall automake, e.g.:\n"
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" - On DEB-based distributions (Debian, Ubuntu, etc): apt-get install automake\n"
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" - On DNF-based distributions (Fedora, RHEL, etc): dnf install automake"
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)
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endif()
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find_package(BISON)
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if(NOT BISON_FOUND)
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message(
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FATAL_ERROR " Buidling Swig ${FLAMEGPU_SWIG_DOWNLOAD} from source requires 'bison', but it could not be found\n"
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" Please insall bison, e.g.:\n"
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" - On DEB-based distributions (Debian, Ubuntu, etc): apt-get install bison\n"
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" - On DNF-based distributions (Fedora, RHEL, etc): dnf install bison"
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)
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endif()
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message(STATUS "[swig] Downloading swig-${FLAMEGPU_SWIG_DOWNLOAD}.tar.gz")
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# Download the content
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FetchContent_Populate(swig)
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WORKING_DIRECTORY ${swig_SOURCE_DIR}
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RESULT_VARIABLE swig_make_RESULT
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OUTPUT_VARIABLE swig_make_OUTPUT
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ERROR_FILE ${swig_make_ERROR_FILE}
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)
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if(NOT swig_make_RESULT EQUAL "0")
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message(FATAL_ERROR
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WORKING_DIRECTORY ${swig_SOURCE_DIR}
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RESULT_VARIABLE swig_makeinstall_RESULT
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OUTPUT_VARIABLE swig_makeinstall_OUTPUT
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ERROR_FILE ${swig_makeinstall_ERROR_FILE}
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)
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if(NOT swig_makeinstall_RESULT EQUAL "0")
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message(FATAL_ERROR

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