[syslinux] extlinux VPATH build issue
H. Peter Anvin
hpa at zytor.com
Fri May 30 11:10:41 PDT 2008
Zach Carter wrote:
> Hi:
>
> I've been seeing intermittent build failures with the extlinux target,
> and I believe I've tracked it down to a VPATH issue. See this make -d
> log:
>
> Finished prerequisites of target file `extlinux'.
> Prerequisite `extlinux.o' is newer than target `extlinux'.
> Prerequisite `setadv.o' is newer than target `extlinux'.
> Prerequisite `extlinux_bss_bin.o' is newer than target `extlinux'.
> Prerequisite `extlinux_sys_bin.o' is newer than target `extlinux'.
> No need to remake target `extlinux'; using VPATH name `../extlinux'.
>
> Since the CWD is named extlinux, and the VPATH includes '..', make is
> using the timestamp on the '../extlinux' directory to decide whether to
> remake the 'extlinux' executable.
>
> I believe the included fix should resolve the issue. It tells make to
> only use the VPATH for *.c and *.o files, which means the VPATH will not
> be searched for the 'extlinux' executable.
>
Interesting, I wasn't familiar with that construct.
Either way, I don't know how useful it is, since have massively revamped
the Makefiles in the 3.70 branch of the Syslinux development tree (see
Syslinux 3.70-pre12); this should hopefully avoid this problem as well.
Even so, it's a useful construct that might come in handy.
-hpa
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