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1fe4b8d693
My glibc bot showed that my conformtest changes fail the build of the conformtest execution tests for x86_64-linux-gnu-static-pie, because linking the newly built object with the newly built libc and the associated options normally used for linking requires it to be built as PIE. Add $(pie-default) to the compiler command used so that PIE options are used when required. There's a case for using the whole of $(CFLAGS-.o) (which includes $(pie-default)), but that raises questions of any impact from using optimization flags from CFLAGS in these tests. So for now just use $(pie-default) as the key part of $(CFLAGS-.o) that's definitely needed. Tested with build-many-glibcs.py for x86_64-linux-gnu-static-pie. (cherry picked from commit 885762aa31d75de8b9fea4c0e2e372b582d4c548)