Github user wgtmac commented on a diff in the pull request:
https://github.com/apache/orc/pull/135#discussion_r126828652
--- Diff: cmake_modules/ThirdpartyToolchain.cmake ---
@@ -0,0 +1,90 @@
+set (LZ4_VERSION "1.7.5")
+set (SNAPPY_VERSION "1.1.3")
+set (ZLIB_VERSION "1.2.11")
+set (THIRDPARTY_DIR "${CMAKE_BINARY_DIR}/c++/libs/thirdparty")
+
+string(TOUPPER ${CMAKE_BUILD_TYPE} UPPERCASE_BUILD_TYPE)
+
+# ----------------------------------------------------------------------
+# Snappy
+
+set (SNAPPY_PREFIX "${THIRDPARTY_DIR}/snappy_ep-install")
+set (SNAPPY_HOME "${SNAPPY_PREFIX}")
+set (SNAPPY_INCLUDE_DIRS "${SNAPPY_PREFIX}/include")
+set (SNAPPY_STATIC_LIB_NAME snappy)
+set (SNAPPY_STATIC_LIB
"${SNAPPY_PREFIX}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}${SNAPPY_STATIC_LIB_NAME}${CMAKE_STATIC_LIBRARY_SUFFIX}")
+set (SNAPPY_SRC_URL
"${CMAKE_SOURCE_DIR}/c++/libs/snappy-${SNAPPY_VERSION}.tar.gz")
+if (${UPPERCASE_BUILD_TYPE} EQUAL "RELEASE")
+ set (SNAPPY_CXXFLAGS "CXXFLAGS='-DNDEBUG -O2'")
+endif ()
+
+ExternalProject_Add (snappy_ep
+ CONFIGURE_COMMAND ./configure "--prefix=${SNAPPY_PREFIX}"
${SNAPPY_CXXFLAGS}
+ BUILD_IN_SOURCE 1
+ BUILD_COMMAND ${MAKE}
+ INSTALL_DIR ${SNAPPY_PREFIX}
+ URL ${SNAPPY_SRC_URL}
--- End diff --
Just curious if it is better to put an HTTP URL here to download
compression libraries? In this approach, we can reduce the repo size and easy
to bump library version in the future.
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