[maemo-developers] [maemo-developers] building an application with custom kernel-headers

[From: Larry Battraw]

  I believe you need to use the capital 'I' option like so:

gcc -c -Wall -g -O2 -isystem -I/usr/src/su-18-kernel-headers/include conftest.c

Larry

On 10/17/06, Yves-Alexis Perez <corsac at corsac.net> wrote:
> Hi list,
>
> I run into probleme trying to build an application which requires custom
> kernel headers on scratchbox (0.9.8.5) using maemo rootstrap 2.0, cpu
> transparency via qemu-arm.
>
> I've built a patched kernel (which boots fine on the device), following
> the Howto Kernel Compilation found on Maemo wiki. I've installed
> su-18-kernel-headers too, and those headers are located
> in /usr/src/su-18-kernel-headers/include in the scratchbox root.
>
> I've checked that these headers have the correct files, with correct
> definition.
>
> The configure script tries to build a sample c file with a test on a
> #define'd variable which exists in the custom headers files (and not in
> the vanilla ones), and fails.
>
> I tried with the sample c file by hand, using:
>
> gcc -c -Wall -g -O2 -isystem /usr/src/su-18-kernel-headers/include
> conftest.c
>
> conftest.c contains:
> ----8<----
> #include <linux/rtnetlink.h>
>
> int
> main ()
> {
> #ifndef IFA_F_HOMEADDRESS
>   char *p = (char *) IFA_F_HOMEADDRESS;
> #endif
>
>   ;
>   return 0;
> }
> ----8<----
>
> and:
> [sbox-fitz: ~] > grep
> IFA_F_HOMEADDRESS /usr/src/su-18-kernel-headers/include/linux/rtnetlink.h
> #define IFA_F_HOMEADDRESS       0x10
>
>
> I guess gcc doesn't use correct kernel headers due to cross compilation,
> but have not clue how to fix this.
>
> If anybody can help me on this, it would be really nice.
>
> Thanks & regards,
> --
> Yves-Alexis Perez
>
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