gnu: Add ctranslate2.

* gnu/packages/machine-learning.scm (ctranslate2): New variable.
* gnu/packages/patches/CTranslate2-local-build.patch: New file.
* gnu/local.mk: Record patch.

Co-authored-by: Nicolas Graves <ngraves@ngraves.fr>
Change-Id: I61f04d92c9f4c7bff41b62867ef43e8cf3ad87ea

gnu/packages/patches/ctranslate2-local-build.patch

@@ -0,0 +1,129 @@
+Patch subprojects to use guix builds instead
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 62b99d1..c1ac38a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -98,7 +98,7 @@ else()
+ endif()
+ 
+ find_package(Threads)
+-add_subdirectory(third_party/spdlog EXCLUDE_FROM_ALL)
++find_package( spdlog)
+ 
+ set(PRIVATE_INCLUDE_DIRECTORIES
+   ${CMAKE_CURRENT_SOURCE_DIR}/src
+@@ -249,9 +249,10 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(amd64)|(AMD64)")
+   set(BUILD_SHARED_LIBS_SAVED "${BUILD_SHARED_LIBS}")
+   set(BUILD_SHARED_LIBS OFF)
+   set(BUILD_TESTING OFF)
+-  add_subdirectory(third_party/cpu_features EXCLUDE_FROM_ALL)
++  find_package( CpuFeatures)
+   set(BUILD_SHARED_LIBS "${BUILD_SHARED_LIBS_SAVED}")
+-  list(APPEND LIBRARIES cpu_features)
++  find_library( CPU_FEATURES_LIBRARIES cpu_features)
++  list(APPEND LIBRARIES ${CPU_FEATURES_LIBRARIES})
+ endif()
+ 
+ if(ENABLE_CPU_DISPATCH)
+@@ -349,8 +350,8 @@ if(WITH_MKL)
+   else()
+     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64")
+     set(MKL_LIBRARIES
+-      ${MKL_LIBRARY_DIR}/libmkl_core.a
+-      ${MKL_LIBRARY_DIR}/libmkl_intel_ilp64.a
++      ${MKL_LIBRARY_DIR}/libmkl_core.so
++      ${MKL_LIBRARY_DIR}/libmkl_intel_ilp64.so
+       )
+   endif()
+ 
+@@ -358,19 +359,19 @@ if(WITH_MKL)
+     if(WIN32)
+       list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/mkl_intel_thread.lib)
+     else()
+-      list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/libmkl_intel_thread.a)
++      list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/libmkl_intel_thread.so)
+     endif()
+   elseif(OPENMP_RUNTIME STREQUAL "COMP")
+     if(WIN32)
+       message(FATAL_ERROR "Building with MKL requires Intel OpenMP")
+     else()
+-      list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/libmkl_gnu_thread.a)
++      list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/libmkl_gnu_thread.so)
+     endif()
+   elseif(OPENMP_RUNTIME STREQUAL "NONE")
+     if(WIN32)
+       list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/mkl_sequential.lib)
+     else()
+-      list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/libmkl_sequential.a)
++      list(APPEND MKL_LIBRARIES ${MKL_LIBRARY_DIR}/libmkl_sequential.so)
+     endif()
+   endif()
+   list(APPEND PRIVATE_INCLUDE_DIRECTORIES ${MKL_INCLUDE_DIR})
+@@ -439,6 +440,7 @@ if (WITH_RUY)
+   add_definitions(-DCT2_WITH_RUY)
+   set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+   set(CPUINFO_LIBRARY_TYPE static CACHE STRING "cpuinfo library type")
++  # if package found and appended to libraries, issue with linking
+   add_subdirectory(third_party/ruy EXCLUDE_FROM_ALL)
+   unset(CMAKE_POSITION_INDEPENDENT_CODE)
+   list(APPEND LIBRARIES ruy)
+diff --git a/cli/CMakeLists.txt b/cli/CMakeLists.txt
+index 3311ad3..7d90693 100644
+--- a/cli/CMakeLists.txt
++++ b/cli/CMakeLists.txt
+@@ -1,14 +1,12 @@
+-if (NOT IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/../third_party/cxxopts/include")
+-  message(FATAL_ERROR "The client dependency repository (cxxopts) is missing! "
+-    "You probably didn't clone the project with --recursive. You can include it "
+-    "by calling \"git submodule update --init --recursive\"")
+-endif()
+-
+ add_executable(translator
+   translator.cc
+   )
++find_path(
++  CXXOPTS_ROOT
++  include/cxxopts.hpp
++)
+ target_include_directories(translator
+-  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../third_party/cxxopts/include
++  PRIVATE ${CXXOPTS_ROOT}/include
+   )
+ target_link_libraries(translator
+   PRIVATE ${PROJECT_NAME}
+diff --git a/src/cpu/cpu_info.cc b/src/cpu/cpu_info.cc
+index 9030ac7..6949644 100644
+--- a/src/cpu/cpu_info.cc
++++ b/src/cpu/cpu_info.cc
+@@ -4,7 +4,7 @@
+ 
+ #include <cstring>
+ 
+-#include <cpuinfo_x86.h>
++#include <cpu_features/cpuinfo_x86.h>
+ 
+ namespace ctranslate2 {
+   namespace cpu {
+diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
+index 283c49d..9ca6cc8 100644
+--- a/tests/CMakeLists.txt
++++ b/tests/CMakeLists.txt
+@@ -2,7 +2,7 @@ enable_testing()
+ 
+ option(BUILD_GMOCK "" OFF)
+ option(INSTALL_GTEST "" OFF)
+-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../third_party/googletest ${CMAKE_CURRENT_BINARY_DIR}/googletest)
++find_package( GTest)
+ 
+ add_executable(ctranslate2_test
+   batching_test.cc
+@@ -20,7 +20,7 @@ target_include_directories(ctranslate2_test PRIVATE
+   )
+ target_link_libraries(ctranslate2_test
+   ${PROJECT_NAME}
+-  gtest_main
++  gtest
+   )
+ 
+ add_executable(benchmark_ops