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set(_srcdir ${CMAKE_CURRENT_LIST_DIR}/gmp)
set(_dstdir ${DESTDIR}/usr/local)
if (MSVC)
set(_output ${_dstdir}/include/gmp.h
${_dstdir}/lib/libgmp-10.lib
${_dstdir}/bin/libgmp-10.dll)
add_custom_command(
OUTPUT ${_output}
COMMAND ${CMAKE_COMMAND} -E copy ${_srcdir}/include/gmp.h ${_dstdir}/include/
COMMAND ${CMAKE_COMMAND} -E copy ${_srcdir}/lib/win${DEPS_BITS}/libgmp-10.lib ${_dstdir}/lib/
COMMAND ${CMAKE_COMMAND} -E copy ${_srcdir}/lib/win${DEPS_BITS}/libgmp-10.dll ${_dstdir}/bin/
)
add_custom_target(dep_GMP SOURCES ${_output})
else ()
set(_gmp_ccflags "-O2 -DNDEBUG -fPIC -DPIC -Wall -Wmissing-prototypes -Wpointer-arith -pedantic -fomit-frame-pointer -fno-common")
set(_gmp_build_tgt "${CMAKE_SYSTEM_PROCESSOR}")
if (APPLE)
if (${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
set(_gmp_build_tgt aarch64)
endif()
set(_gmp_ccflags "${_gmp_ccflags} -mmacosx-version-min=${DEP_OSX_TARGET}")
set(_gmp_build_tgt "--build=${_gmp_build_tgt}-apple-darwin")
elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
if (${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
set(_gmp_ccflags "${_gmp_ccflags} -march=armv7-a") # Works on RPi-4
set(_gmp_build_tgt armv7)
endif()
set(_gmp_build_tgt "--build=${_gmp_build_tgt}-pc-linux-gnu")
else ()
set(_gmp_build_tgt "") # let it guess
endif()
ExternalProject_Add(dep_GMP
# URL https://gmplib.org/download/gmp/gmp-6.1.2.tar.bz2
URL https://gmplib.org/download/gmp/gmp-6.2.1.tar.bz2
BUILD_IN_SOURCE ON
CONFIGURE_COMMAND env "CFLAGS=${_gmp_ccflags}" "CXXFLAGS=${_gmp_ccflags}" ./configure --enable-shared=no --enable-cxx=yes --enable-static=yes "--prefix=${DESTDIR}/usr/local" ${_gmp_build_tgt}
BUILD_COMMAND make -j
INSTALL_COMMAND make install
)
endif ()
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