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CONFIGURE: Add an environemt variable that discards the --host option #30
Backported (and modified) commit scummvm/scummvm@8c28a2d to be used in scummvm-tools. In commit 7a68e70 the configure script was modified to silently ignore some options, that are not needed for scummvm-tools, but are valid for the configure script generated by GNU Autotools, so the configure macro for RPM-based distributions can be used when building a rpm package for them. Unfortunately the configure script, as used by scummvm-tools uses the --host option to determine the target system it will actually be build for. Autotools based configure scripts have a --target option for such a purpose, and use the --host option to determine the system the build is performed on. For that reason there should be a way to discard the parameters passed to the configure script with the --host option. The easiest approach to achieve this goal, is to have an environment variable, which when set influences the configure script to ignore the parameters of the --host option. Thus we introduced a variable called 'CONFIGURE_NO_HOST', that will when set to anything, but an empty value, before invoking the configure script, have the parameters of the --host option take no influence on the configure stage (and the build stage as well).