Descriptionandroid: Support host multilib builds.
The Android build system now supports multilib 32/64-bit host builds as
well as target builds, and Chromium needs to make use of this to
properly support compiling V8 for host. Introduce a GYP_HOST_VAR_PREFIX
variable that works equivalently to GYP_VAR_PREFIX and use it in all the
places where the first/second host architecture must be selected, and
also introduce GYP_HOST_MULTILIB to enable the top level makefile to
specify whether it wants 32-bit or 64-bit host binaries.
BUG=chromium:358141
r1970
Patch Set 1 #Patch Set 2 : Add test case #Patch Set 3 : Fix build warning in test #
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