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Re: [Qemu-devel] [PATCH] Makefile: fix up parallel building under MSYS+M
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH] Makefile: fix up parallel building under MSYS+MinGW |
Date: |
Mon, 2 Mar 2015 21:32:32 +0900 |
On 18 February 2015 at 21:59, Vasily Efimov <address@hidden> wrote:
> This patch enables parallel building of QEMU in MSYS+MinGW environment.
> Currently an attempt to build QEMU in parallel fails on generation of
> version.lo (and version.o too).
>
> The cause of the failure is that when listing prerequisites "Makefile"
> references "config-host.h" by absolute path in some rules and by relative
> path in others. Make cannot figure out that these references points to the
> same file which leads to the race: the generation of "version.*" which
> requires "$(BUILD_DIR)/config-host.h" is launched in parallel with the
> generation of "config-host.h" needed by other "Makefile" targets.
Thanks for looking into this -- I'd run into the problem a couple
of times but not been able to track down why it was happening...
-- PMM
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