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The locations for native-toolchain packages in IMPALA_TOOLCHAIN currently do not include the compiler version. This means that the toolchain can't distinguish between native-toolchain packages built with gcc 4.9.2 versus gcc 7.5.0. The collisions can cause issues when switching back and forth between branches. This introduces the IMPALA_TOOLCHAIN_PACKAGES_HOME environment variable, which is a location inside IMPALA_TOOLCHAIN that would hold native-toolchain packages. Currently, it is set to the same as IMPALA_TOOLCHAIN, so there is no difference in behavior. This lays the groundwork to add the compiler version to this path when switching to GCC7. Testing: - The only impediment to building with IMPALA_TOOLCHAIN_PACKAGES_HOME=$IMPALA_TOOLCHAIN/test is Impala-lzo. With a custom Impala-lzo, compilation succeeds. Either Impala-lzo will be fixed or it will be removed. - Core tests Change-Id: I1ff641e503b2161baf415355452f86b6c8bfb15b Reviewed-on: http://gerrit.cloudera.org:8080/15991 Reviewed-by: Joe McDonnell <joemcdonnell@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>