pitrou commented on code in PR #43689:
URL: https://github.com/apache/arrow/pull/43689#discussion_r1718134258
##########
cpp/cmake_modules/ThirdpartyToolchain.cmake:
##########
@@ -1353,26 +1353,9 @@ macro(build_snappy)
set(SNAPPY_CMAKE_ARGS
${EP_COMMON_CMAKE_ARGS} -DSNAPPY_BUILD_TESTS=OFF
-DSNAPPY_BUILD_BENCHMARKS=OFF
"-DCMAKE_INSTALL_PREFIX=${SNAPPY_PREFIX}")
- # Snappy unconditionally enables -Werror when building with clang this can
lead
- # to build failures by way of new compiler warnings. This adds a flag to
disable
- # Werror to the very end of the invocation to override the snappy internal
setting.
- if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
- foreach(CONFIG DEBUG MINSIZEREL RELEASE RELWITHDEBINFO)
- list(APPEND
- SNAPPY_CMAKE_ARGS
-
"-DCMAKE_CXX_FLAGS_${UPPERCASE_BUILD_TYPE}=${EP_CXX_FLAGS_${CONFIG}} -Wno-error"
- )
- endforeach()
- endif()
-
- if(APPLE AND CMAKE_HOST_SYSTEM_VERSION VERSION_LESS 20)
- # On macOS 10.13 we need to explicitly add <functional> to avoid a missing
include error
- # This can be removed once CRAN no longer checks on macOS 10.13
- find_program(PATCH patch REQUIRED)
- set(SNAPPY_PATCH_COMMAND ${PATCH} -p1 -i
${CMAKE_CURRENT_LIST_DIR}/snappy.diff)
- else()
- set(SNAPPY_PATCH_COMMAND)
- endif()
+ # See comments in snappy.diff.
+ find_program(PATCH patch REQUIRED)
+ set(SNAPPY_PATCH_COMMAND ${PATCH} -p1 -i
${CMAKE_CURRENT_LIST_DIR}/snappy.diff)
Review Comment:
OTOH, `patch` is useful and could be needed for other bundled builds.
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