从autotool迁移到cmake

找到一些实现
https://graphics.rwth-aachen.de:9000/OpenFlipper-Free/OpenFlipper-Free/blob/ps/cmake/FindGMP.cmake
https://gitlab.inria.fr/batsim/batsched/blob/master/cmake/Modules/FindGMP.cmake
https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004135300-How-to-use-GMP-with-Cmake-on-CLion-
https://www.reddit.com/r/cmake/comments/4qozat/how_to_use_gmp/
https://github.com/rhalstea/p4c/blob/052f00935b72c106dbc87c1be1dabd19e6844d1d/cmake/FindLibGmp.cmake

然后参考 FindSQLite3.cmake 自己写了一个
最后的用法

find_package(GMP REQUIRED)
target_link_libraries(guile  GMP::GMP)

实现代码
见：https://github.com/PikachuHy/guile/blob/1.8-cmake/cmake/FindGMP.cmake

#[=======================================================================[.rst:
FindGMP
-----------Find the GMP librariesIMPORTED targets
^^^^^^^^^^^^^^^^This module defines the following :prop_tgt:`IMPORTED` target:``GMP::GMP``Result variables
^^^^^^^^^^^^^^^^This module will set the following variables if found:``GMP_INCLUDE_DIRS``where to find gmp.h, etc.
``GMP_LIBRARIES``the libraries to link against to use GMP.
``GMP_VERSION``version of the GMP library found
``GMP_FOUND``TRUE if found#]=======================================================================]# Look for the necessary header
find_path(GMP_INCLUDE_DIR NAMES gmp.h)
mark_as_advanced(GMP_INCLUDE_DIR)# Look for the necessary library
find_library(GMP_LIBRARY NAMES gmp libgmp)
mark_as_advanced(GMP_LIBRARY)if(GMP_INCLUDE_DIR)file(STRINGS ${GMP_INCLUDE_DIR}/gmp.h __GNU_MP_VERSION_ver_lineREGEX "^#define __GNU_MP_VERSION  *[0-9]"LIMIT_COUNT 1)file(STRINGS ${GMP_INCLUDE_DIR}/gmp.h __GNU_MP_VERSION_MINOR_ver_lineREGEX "^#define __GNU_MP_VERSION_MINOR  *[0-9]"LIMIT_COUNT 1)file(STRINGS ${GMP_INCLUDE_DIR}/gmp.h __GNU_MP_VERSION_PATCHLEVEL_ver_lineREGEX "^#define __GNU_MP_VERSION_PATCHLEVEL  *[0-9]"LIMIT_COUNT 1)string(REGEX MATCH "[0-9]" GMP_VERSION_MAJOR "${__GNU_MP_VERSION_ver_line}")string(REGEX MATCH "[0-9]" GMP_VERSION_MINOR "${__GNU_MP_VERSION_MINOR_ver_line}")string(REGEX MATCH "[0-9]" GMP_VERSION_PATCH "${__GNU_MP_VERSION_PATCHLEVEL_ver_line}")set(GMP_VERSION "${GMP_VERSION_MAJOR}.${GMP_VERSION_MINOR}.${GMP_VERSION_PATCH}")
endif()include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GMPREQUIRED_VARS GMP_INCLUDE_DIR GMP_LIBRARYVERSION_VAR GMP_VERSION)# Create the imported target
if(GMP_FOUND)set(GMP_INCLUDE_DIRS ${GMP_INCLUDE_DIR})set(GMP_LIBRARIES ${GMP_LIBRARY})if(NOT TARGET GMP::GMP)add_library(GMP::GMP UNKNOWN IMPORTED)set_target_properties(GMP::GMP PROPERTIESIMPORTED_LOCATION             "${GMP_LIBRARY}"INTERFACE_INCLUDE_DIRECTORIES "${GMP_INCLUDE_DIR}")endif()
endif()

参考
https://gitlab.com/graphviz/graphviz/blob/master/cmake/FindLTDL.cmake
https://cmake.org/pipermail/cmake/2010-June/037579.html
https://github.com/nest/nest-simulator/blob/master/cmake/FindLTDL.cmake
https://github.com/fzi-forschungszentrum-informatik/schunk_svh_driver/blob/master/icmaker/CMakeModules/FindLtdl.cmake

Usage


find_package(Math REQUIRED)
find_package(LTDL REQUIRED)
target_link_libraries(guile  Math::Math LTDL::LTDL)

code:
https://github.com/PikachuHy/guile/blob/1.8-cmake/cmake/FindLTDL.cmake
https://github.com/PikachuHy/guile/blob/1.8-cmake/cmake/FindMath.cmake

#[=======================================================================[.rst:
FindLTDL
-----------Find the LTDL librariesIMPORTED targets
^^^^^^^^^^^^^^^^This module defines the following :prop_tgt:`IMPORTED` target:``LTDL::LTDL``Result variables
^^^^^^^^^^^^^^^^This module will set the following variables if found:``LTDL_INCLUDE_DIRS``where to find ltdl.h, etc.
``LTDL_LIBRARIES``the libraries to link against to use ltdl.
``LTDL_VERSION``version of the ltdl library found
``LTDL_FOUND``TRUE if found#]=======================================================================]# Look for the necessary header
find_path(LTDL_INCLUDE_DIR NAMES ltdl.h)
mark_as_advanced(LTDL_INCLUDE_DIR)# Look for the necessary library
find_library(LTDL_LIBRARY NAMES ltdl)
mark_as_advanced(LTDL_LIBRARY)find_program(LIBTOOL_EXECUTABLENAMES glibtool libtool libtoolize)
if ( NOT LIBTOOL_EXECUTABLE STREQUAL "LIBTOOL_EXECUTABLE-NOTFOUND" )execute_process(COMMAND ${LIBTOOL_EXECUTABLE} --versionRESULT_VARIABLE RESULTOUTPUT_VARIABLE LTDL_VAR_OUTPUTOUTPUT_STRIP_TRAILING_WHITESPACE)if ( RESULT EQUAL 0 )string( REGEX REPLACE ".* ([0-9]+\\.[0-9]+\\.[0-9]+).*" "\\1"LTDL_VERSION ${LTDL_VAR_OUTPUT} )endif ()
endif ()include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(LTDLREQUIRED_VARS LTDL_INCLUDE_DIR LTDL_LIBRARYVERSION_VAR LTDL_VERSION)# Create the imported target
if(LTDL_FOUND)set(LTDL_INCLUDE_DIRS ${LTDL_INCLUDE_DIR})set(LTDL_LIBRARIES ${LTDL_LIBRARY})if(NOT TARGET LTDL::LTDL)add_library(LTDL::LTDL UNKNOWN IMPORTED)set_target_properties(LTDL::LTDL PROPERTIESIMPORTED_LOCATION             "${LTDL_LIBRARY}"INTERFACE_INCLUDE_DIRECTORIES "${LTDL_INCLUDE_DIR}")endif()
endif()

# https://android.googlesource.com/platform/external/eigen/+/master/cmake/FindStandardMathLibrary.cmake
# Look for the necessary library
# Look for the necessary header
find_path(MATH_INCLUDE_DIR NAMES math.h)
mark_as_advanced(MATH_INCLUDE_DIR)# Look for the necessary library
find_library(MATH_LIBRARY NAMES m libm)
mark_as_advanced(MATH_LIBRARY)
include(CheckCSourceCompiles)
set(find_math_library_test_program"#include<math.h>
int main() { sin(0.0); log(0.0f); }")
set(CMAKE_REQUIRED_FLAGS "")
set(CMAKE_REQUIRED_LIBRARIES "m")
check_c_source_compiles("${find_math_library_test_program}"math_library_linked_to_as_m)
if(math_library_linked_to_as_m)include(FindPackageHandleStandardArgs)find_package_handle_standard_args(Math REQUIRED_VARS MATH_LIBRARY)
endif()# Create the imported target
if(Math_FOUND)set(MATH_LIBRARIES ${MATH_LIBRARY})if(NOT TARGET Math::Math)add_library(Math::Math UNKNOWN IMPORTED)set_target_properties(Math::Math PROPERTIESIMPORTED_LOCATION             "${MATH_LIBRARY}")endif()
endif()

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