linux

History

Michael Ellerman 1619b69edc powerpc/boot: Fix build failure since GCC 4.9 removal Stephen reported that the build was broken since commit `6d2ef226f2` ("compiler_attributes.h: drop __has_attribute() support for gcc4"), with errors such as: include/linux/compiler_attributes.h:296:5: warning: "__has_attribute" is not defined, evaluates to 0 [-Wundef] 296 \| #if __has_attribute(__warning__) \| ^~~~~~~~~~~~~~~ make[2]: *** [arch/powerpc/boot/Makefile:225: arch/powerpc/boot/crt0.o] Error 1 But we expect __has_attribute() to always be defined now that we've stopped using GCC 4. Linus debugged it to the point of reading the GCC sources, and noticing that the problem is that __has_attribute() is not defined when preprocessing assembly files, which is what we're doing here. Our assembly files don't include, or need, compiler_attributes.h, but they are getting it unconditionally from the -include in BOOT_CFLAGS, which is then added in its entirety to BOOT_AFLAGS. That -include was added in commit `77433830ed` ("powerpc: boot: include compiler_attributes.h") so that we'd have "fallthrough" and other attributes defined for the C files in arch/powerpc/boot. But it's not needed for assembly files. The minimal fix is to move the addition to BOOT_CFLAGS of -include compiler_attributes.h until after we've copied BOOT_CFLAGS into BOOT_AFLAGS. That avoids including compiler_attributes.h for asm files, but makes no other change to BOOT_CFLAGS or BOOT_AFLAGS. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Debugged-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2021-09-14 08:33:32 -07:00
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dts	…
.gitignore	…
4xx.c	…
4xx.h	…
44x.h	…
Makefile	…
README	…
addnote.c	…
bamboo.c	…
cpm-serial.c	…
crt0.S	…
crtsavres.S	…
cuboot-8xx.c	…
cuboot-52xx.c	…
cuboot-83xx.c	…
cuboot-85xx-cpm2.c	…
cuboot-85xx.c	…
cuboot-824x.c	…
cuboot-acadia.c	…
cuboot-amigaone.c	…
cuboot-bamboo.c	…
cuboot-ebony.c	…
cuboot-hotfoot.c	…
cuboot-katmai.c	…
cuboot-kilauea.c	…
cuboot-mpc7448hpc2.c	…
cuboot-pq2.c	…
cuboot-rainier.c	…
cuboot-sam440ep.c	…
cuboot-sequoia.c	…
cuboot-taishan.c	…
cuboot-warp.c	…
cuboot-yosemite.c	…
cuboot.c	…
cuboot.h	…
dcr.h	…
decompress.c	…
devtree.c	…
div64.S	…
dummy.c	…
ebony.c	…
elf.h	…
elf_util.c	…
ep88xc.c	…
ep8248e.c	…
epapr-wrapper.c	…
epapr.c	…
fixed-head.S	…
fixup-headers.sed	…
fsl-soc.c	…
fsl-soc.h	…
gamecube-head.S	…
gamecube.c	…
hack-coff.c	…
holly.c	…
install.sh	…
io.h	…
libfdt-wrapper.c	…
libfdt_env.h	…
main.c	…
microwatt.c	…
mktree.c	…
motload-head.S	…
mpc8xx.c	…
mpc8xx.h	…
mpc52xx-psc.c	…
mvme5100.c	…
mvme7100.c	…
ns16550.c	…
of.c	…
of.h	…
ofconsole.c	…
oflib.c	…
opal-calls.S	…
opal.c	…
ops.h	…
page.h	…
planetcore.c	…
planetcore.h	…
ppc_asm.h	…
ppcboot-hotfoot.h	…
ppcboot.h	…
pq2.c	…
pq2.h	…
ps3-head.S	…
ps3-hvcall.S	…
ps3.c	…
pseries-head.S	…
redboot-8xx.c	…
redboot-83xx.c	…
redboot.h	…
reg.h	…
rs6000.h	…
serial.c	…
simple_alloc.c	…
simpleboot.c	…
stdbool.h	…
stdint.h	…
stdio.c	…
stdio.h	…
stdlib.c	…
stdlib.h	…
string.S	…
string.h	…
swab.h	…
treeboot-akebono.c	…
treeboot-bamboo.c	…
treeboot-currituck.c	…
treeboot-ebony.c	…
treeboot-iss4xx.c	…
types.h	…
ugecon.c	…
ugecon.h	…
util.S	…
wii-head.S	…
wii.c	…
wrapper	…
xz_config.h	…
zImage.coff.lds.S	…
zImage.lds.S	…
zImage.ps3.lds.S	…

README

To extract the kernel vmlinux, System.map, .config or initrd from the zImage binary:

objcopy -j .kernel:vmlinux -O binary zImage vmlinux.gz
objcopy -j .kernel:System.map -O binary zImage System.map.gz
objcopy -j .kernel:.config -O binary zImage config.gz
objcopy -j .kernel:initrd -O binary zImage.initrd initrd.gz


	Peter