[Buildroot] [PATCH] dhcpcd: fix build with ccache

[Max Filippov]

Hi,

On Sun, Jun 22, 2014 at 5:26 PM, Thomas De Schampheleire
<patrickdepinguin at gmail.com> wrote:
> After the bump to dhcpcd 6.4.0, building dhcpcd with ccache fails at the
> configure step:
>
> Using compiler .. <buildroot>/output/host/usr/bin/ccache <buildroot>/output/host/usr/bin/i686-pc-linux-gnu-gcc
> <buildroot>/output/host/usr/bin/ccache <buildroot>/output/host/usr/bin/i686-pc-linux-gnu-gcc is not an executable
> make: *** [<buildroot>/output/build/dhcpcd-6.4.0/.stamp_configured] Error 1
>
> This patch backports an upstream patch to fix this issue.
>
> Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire at gmail.com>
>
> ---
>  package/dhcpcd/dhcpcd-0001-fix-build-with-ccache.patch |  32 ++++++++++++++
>  1 files changed, 32 insertions(+), 0 deletions(-)
>
> diff -r a59338f65a46 -r d3257052bc95 package/dhcpcd/dhcpcd-0001-fix-build-with-ccache.patch
> --- /dev/null   Thu Jan 01 00:00:00 1970 +0000
> +++ b/package/dhcpcd/dhcpcd-0001-fix-build-with-ccache.patch    Sun Jun 22 15:22:35 2014 +0200
> @@ -0,0 +1,32 @@
> +configure: support builds using ccache
> +
> +The configure script checks whether CC is executable by means of a check
> +'type $CC'. However, when using ccache, CC is normally set to "ccache gcc"
> +(using the appropriate paths). Such a compound string is not recognized by
> +type, however, and thus configure bails out.
> +
> +This patch changes the check 'type $CC' with a compile test.
> +
> +Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire at gmail.com>
> +
> +Upstream status: another implementation was submitted, modified by
> +maintainer Roy, then simplified based on my suggestion. This patch is a fold
> +of the two upstream patches:
> +http://roy.marples.name/projects/dhcpcd/info/5f4bf91142fceac502c478886aeb5079a184bb43
> +http://roy.marples.name/projects/dhcpcd/info/26bc10be2405659bdf31d690a72d377d6b67ebd4
> +
> +diff -r 66c8bdc88858 configure
> +--- a/configure        Sat Jun 21 16:54:30 2014 +0200
> ++++ b/configure        Sun Jun 22 15:20:25 2014 +0200
> +@@ -272,8 +272,9 @@
> + fi
> +
> + echo "Using compiler .. $CC"
> +-if ! type "$CC" >/dev/null 2>&1; then
> +-      echo "$CC is not an executable"
> ++if ! echo "int main(void) { return 0; }" | $CC -x c -o /dev/null - 2>/dev/null

This test fails when executed with otherwise working gcc for xtensa,
at the linking step linker needs to be able to read the object it creates.
Please see the following thread:
http://comments.gmane.org/gmane.comp.lib.uclibc.buildroot/87809

The first quoted fix applied alone works just fine, so I'd suggest reverting the
simplification part of this fix.

-- 
Thanks.
-- Max