how does SCR_URI_OVERRIDES_PACKAGE_ARCH affect building tslib?

looking at SRC_URI_OVERRIDES_PACKAGE_ARCH variable, and i notice
first that there is only one usage of it in all of oe-core (tslib), but i'm confused as to what value it has.

the ref manual reads:

"By default, the OpenEmbedded build system automatically detects whether SRC_URI contains files that are machine-specific. If so, the build system automatically changes PACKAGE_ARCH. Setting this variable to "0" disables this behavior."

first, i'm not sure what about the tslib SRC_URI appears to be
machine-specific. also, just for fun, i commented out that line in the tslib .bb file, and did a global "bb show" to see what difference it made, and i saw no difference at all. so what exactly is the purpose of that line in that recipe? what difference should i be able to see with versus without it? thanks.

On Fri, Aug 8, 2014 at 3:35 AM, Robert P. J. Day <[email protected]> wrote:

  looking at SRC_URI_OVERRIDES_PACKAGE_ARCH variable, and i notice first that there is only one usage of it in all of oe-core (tslib), but i'm confused as to what value it has.

  the ref manual reads:

"By default, the OpenEmbedded build system automatically detects whether SRC_URI contains files that are machine-specific. If so, the build system automatically changes PACKAGE_ARCH. Setting this variable to "0" disables this behavior."

  first, i'm not sure what about the tslib SRC_URI appears to be machine-specific. also, just for fun, i commented out that line in the tslib .bb file, and did a global "bb show" to see what difference it made, and i saw no difference at all. so what exactly is the purpose of that line in that recipe? what difference should i be able to see with versus without it? thanks.

Any file:// file in an SRC_URI can become machine specific if placed in a machine subdir in the search path. That said, I don't know why the automatic behavior of setting package_arch in that case is something that needs to be disabled for tslib. I'd suggest using git-blame to examine the commits which added this variable.