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linux5.1: add patch to unbreak build on big-endian ppc64 + gcc9

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q66 2019-07-04 21:28:54 +02:00 committed by Jürgen Buchmüller
parent 8102e009d4
commit 7801a8cef8
1 changed files with 28 additions and 0 deletions
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srcpkgs/linux5.1/patches/ppc64-be-gcc91.patch Normal file
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@ -0,0 +1,28 @@
Since gcc 9.1, adding `-mcall-aixdesc` to cflags makes it no longer define
`__linux__`, which breaks compilation of the kernel in places where the macro
is checked (which is multiple). This behavior is actually more correct than
it was before, as `-mcall-aixdesc` is only meant to be used when compiling
for AIX.
However, it is not enough to just drop it and use `-mabi=elfv1`, as that
results in a ton of undefined references all over the place when linking.
So work around it until upstream sorts it out.
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -96,6 +96,7 @@ endif
ifdef CONFIG_PPC64
cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mcall-aixdesc)
+cflags-$(CONFIG_CPU_BIG_ENDIAN) += -D__linux__
aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
endif
@@ -151,6 +152,7 @@ AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
else
CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
+CFLAGS-$(CONFIG_PPC64) += -D__linux__
AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
endif
CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))