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The powerpc boot wrapper Makefile is not parallel build safe, causing fixdep
to fail reading dependency files of the addnote, hack-coff and mktree
utilities when concurrently building different image targets.
A typical failure looks like:
Building modules, stage 2.
HOSTCC arch/powerpc/boot/addnote
HOSTCC arch/powerpc/boot/hack-coff
DTC arch/powerpc/boot/taishan.dtb
HOSTCC arch/powerpc/boot/addnote
HOSTCC arch/powerpc/boot/hack-coff
MODPOST 800 modules
fixdep: error opening depfile: arch/powerpc/boot/.hack-coff.d: No such file or directory
scripts/Makefile.host:91: recipe for target 'arch/powerpc/boot/hack-coff' failed
make[5]: *** [arch/powerpc/boot/hack-coff] Error 2
make[5]: *** Waiting for unfinished jobs....
fixdep: error opening depfile: arch/powerpc/boot/.addnote.d: No such file or directory
scripts/Makefile.host:91: recipe for target 'arch/powerpc/boot/addnote' failed
make[5]: *** [arch/powerpc/boot/addnote] Error 2
rm arch/powerpc/boot/taishan.dtb
arch/powerpc/Makefile:263: recipe for target 'cuImage.taishan' failed
make[4]: *** [cuImage.taishan] Error 2
make[4]: *** Waiting for unfinished jobs....
Add a GNU make specific .NOTPARALLEL pseudo rule to enforce sequential building
of the addnote, hack-coff and mktree executables.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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