Ian Jackson
2010-Mar-05 12:10 UTC
[Xen-devel] [PATCH] Makefile targets generating several files at once
In a few places in the tree the Makefiles have constructs like this:
one_file another_file:
$(COMMAND_WHICH_GENERATES_BOTH_AT_ONCE)
This is wrong, because make will run _two copies_ of the same command
at once. This generally causes races and hard-to-reproduce build
failures.
Notably, `make -j4'' at the top level will build stubdom libxc twice
simultaneously!
In this patch we replace the occurrences of this construct with the
correct idiom:
one_file: another_file
another_file:
$(COMMAND_WHICH_GENERATES_BOTH_AT_ONCE)
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
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