[Cake] gcc 7.3.1 issue on arch

[Cake] gcc 7.3.1 issue on arch

[Bret Towe]

for anyone seeing a compile error like the below on Arch Linux

  CC [M]  /root/sch_cake/sch_cake.o
In file included from ./include/linux/list.h:9:0,
                 from ./include/linux/module.h:9,
                 from /root/sch_cake/sch_cake.c:42:
./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or directory
 #include <stdarg.h>
          ^~~~~~~~~~
compilation terminated.


the workaround is below

diff --git a/Makefile b/Makefile
index 2c473e3..428ffbf 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ obj-m := sch_cake.o
 KERNEL_VERSION := $(shell uname -r)
 IDIR := /lib/modules/$(KERNEL_VERSION)/kernel/net/sched/
 KDIR := /lib/modules/$(KERNEL_VERSION)/build
+ccflags-y=-I/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include
 PWD := $(shell pwd)
 VERSION := $(shell git rev-parse HEAD 2>/dev/null)
 default:

Re: [Cake] gcc 7.3.1 issue on arch

[Toke Høiland-Jørgensen]

Bret Towe <bret.towe@gmail.com> writes:

> for anyone seeing a compile error like the below on Arch Linux
>
>   CC [M]  /root/sch_cake/sch_cake.o
> In file included from ./include/linux/list.h:9:0,
>                  from ./include/linux/module.h:9,
>                  from /root/sch_cake/sch_cake.c:42:
> ./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or directory
>  #include <stdarg.h>
>           ^~~~~~~~~~
> compilation terminated.

I was seeing the same issue on a full kernel compile, which was fixed by
make clean && make

-Toke

Re: [Cake] gcc 7.3.1 issue on arch

[Bret Towe]

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On Thu, Mar 29, 2018, 5:50 AM Toke Høiland-Jørgensen <toke@toke.dk> wrote:

> Bret Towe <bret.towe@gmail.com> writes:
>
> > for anyone seeing a compile error like the below on Arch Linux
> >
> >   CC [M]  /root/sch_cake/sch_cake.o
> > In file included from ./include/linux/list.h:9:0,
> >                  from ./include/linux/module.h:9,
> >                  from /root/sch_cake/sch_cake.c:42:
> > ./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or
> directory
> >  #include <stdarg.h>
> >           ^~~~~~~~~~
> > compilation terminated.
>
> I was seeing the same issue on a full kernel compile, which was fixed by
> make clean && make
>
> -Toke
>

I had tried that and it made no difference for me

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Re: [Cake] gcc 7.3.1 issue on arch

[Jonathan Morton]

> On 29 Mar, 2018, at 1:30 am, Bret Towe <bret.towe@gmail.com> wrote:
> 
> ./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or directory

I've started seeing the same error on my PowerPC box, running Gentoo.  It seemed specific to that machine, but the GCC version may well be relevant since Gentoo tends to stabilise new GCC versions earlier on minority platforms.

Shouldn't stdarg.h be a built-in header?

 - Jonathan Morton

Re: [Cake] gcc 7.3.1 issue on arch

[Toke Høiland-Jørgensen]

Jonathan Morton <chromatix99@gmail.com> writes:

>> On 29 Mar, 2018, at 1:30 am, Bret Towe <bret.towe@gmail.com> wrote:
>> 
>> ./include/linux/kernel.h:6:10: fatal error: stdarg.h: No such file or directory
>
> I've started seeing the same error on my PowerPC box, running Gentoo.
> It seemed specific to that machine, but the GCC version may well be
> relevant since Gentoo tends to stabilise new GCC versions earlier on
> minority platforms.

Yeah, definitely only shows up in very new GCCs.

> Shouldn't stdarg.h be a built-in header?

Yup, which is why this is really odd...

-Toke

Re: [Cake] gcc 7.3.1 issue on arch

[Jonathan Morton]

> On 29 Mar, 2018, at 9:13 pm, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> 
>> I've started seeing the same error on my PowerPC box, running Gentoo.
>> It seemed specific to that machine, but the GCC version may well be
>> relevant since Gentoo tends to stabilise new GCC versions earlier on
>> minority platforms.
> 
> Yeah, definitely only shows up in very new GCCs.

PPC is running gcc 7.3.0, fails.  Haven't tried the workaround yet.

E-450 (amd64) is running gcc 6.4.0, succeeds.

 - Jonathan Morton