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Commit 23243c1ace9f ("arch: use cross_compiling to check whether it is
a cross build or not") broke 64-bit parisc builds on 32-bit parisc
systems.
Helge mentioned:
- 64-bit parisc userspace is not supported yet [1]
- hppa gcc does not support "-m64" flag [2]
That means, parisc developers working on a 32-bit parisc machine need
to use hppa64-linux-gnu-gcc (cross compiler) for building the 64-bit
parisc kernel.
After the offending commit, gcc is used in such a case because
both $(SRCARCH) and $(SUBARCH) are 'parisc', hence cross_compiling is
unset.
A correct way is to introduce ARCH=parisc64 because building the 64-bit
parisc kernel on a 32-bit parisc system is not exactly a native build,
but rather a semi-cross build.
[1]: https://lore.kernel.org/linux-parisc/[email protected]/#t
[2]: https://lore.kernel.org/linux-parisc/[email protected]/
Fixes: 23243c1ace9f ("arch: use cross_compiling to check whether it is a cross build or not")
Signed-off-by: Masahiro Yamada <[email protected]>
Reported-by: Meelis Roos <[email protected]>
Tested-by: Meelis Roos <[email protected]>
Cc: <[email protected]> # v5.13+
Signed-off-by: Helge Deller <[email protected]>
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