[RFCv3,10/15] package/pkg-generic: handle host-ccache as a regular dependency

This moves the host-ccache dependency handling from
DEPENDENCIES_HOST_PREREQ to a proper package dependency. When
BR2_CCACHE=y, we add host-ccache as a regular dependency of all
packages except:

 - The extractor packages host-tar, host-xz and host-lzip

 - host-ccache itself

 - host-skeleton, because all packages depend on it

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
Changes since v2:
 - New patch
---
 package/ccache/ccache.mk             | 5 +++++
 package/pkg-generic.mk               | 6 ++++++
 support/dependencies/dependencies.mk | 4 ----
 3 files changed, 11 insertions(+), 4 deletions(-)

Thomas, All,

On 2017-12-01 21:53 +0100, Thomas Petazzoni spake thusly:
> This moves the host-ccache dependency handling from
> DEPENDENCIES_HOST_PREREQ to a proper package dependency. When
> BR2_CCACHE=y, we add host-ccache as a regular dependency of all
> packages except:
> 
>  - The extractor packages host-tar, host-xz and host-lzip
> 
>  - host-ccache itself
> 
>  - host-skeleton, because all packages depend on it
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
> Changes since v2:
>  - New patch
> ---
>  package/ccache/ccache.mk             | 5 +++++
>  package/pkg-generic.mk               | 6 ++++++
>  support/dependencies/dependencies.mk | 4 ----
>  3 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/package/ccache/ccache.mk b/package/ccache/ccache.mk
> index afbec44fac..d6ef455e8b 100644
> --- a/package/ccache/ccache.mk
> +++ b/package/ccache/ccache.mk
> @@ -21,6 +21,11 @@ CCACHE_LICENSE_FILES = LICENSE.txt GPL-3.0.txt
>  # has zero dependency besides the C library.
>  HOST_CCACHE_CONF_OPTS += --with-bundled-zlib
>  
> +# We are ccache, so we can't use ccache
> +HOST_CCACHE_CONF_ENV = \
> +	CC="$(HOSTCC_NOCCACHE)" \
> +	CXX="$(HOSTCXX_NOCCACHE)"
> +
>  # Patch host-ccache as follows:
>  #  - Use BR_CACHE_DIR instead of CCACHE_DIR, because CCACHE_DIR
>  #    is already used by autotargets for the ccache package.
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index e623afe7bc..cb5889c9ef 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -599,6 +599,12 @@ ifeq ($(filter host-tar host-skeleton host-xz host-lzip,$(1)),)
>  $(2)_EXTRACT_DEPENDENCIES += $(BR2_LZIP_HOST_DEPENDENCY)
>  endif
>  
> +ifeq ($(BR2_CCACHE),y)
> +ifeq ($(filter host-tar host-skeleton host-xz host-lzip,$(1)),)
> +$(2)_DEPENDENCIES += host-ccache

Sorry, I must be dumb, but I don't see where you exclude host-ccache
from being its own dependency...

But I surely agree on the principle of this patch! ;-)

Regards,
Yann E. MORIN.

> +endif
> +endif
> +
>  # Eliminate duplicates in dependencies
>  $(2)_FINAL_DEPENDENCIES = $$(sort $$($(2)_DEPENDENCIES))
>  $(2)_FINAL_EXTRACT_DEPENDENCIES = $$(sort $$($(2)_EXTRACT_DEPENDENCIES))
> diff --git a/support/dependencies/dependencies.mk b/support/dependencies/dependencies.mk
> index ef2ae9b7e1..1a4b5df9f2 100644
> --- a/support/dependencies/dependencies.mk
> +++ b/support/dependencies/dependencies.mk
> @@ -14,10 +14,6 @@ $(shell support/dependencies/check-host-$(1).sh $(2))
>  endef
>  -include $(sort $(wildcard support/dependencies/check-host-*.mk))
>  
> -ifeq ($(BR2_CCACHE),y)
> -DEPENDENCIES_HOST_PREREQ += host-ccache
> -endif
> -
>  core-dependencies:
>  	@HOSTCC="$(firstword $(HOSTCC))" MAKE="$(MAKE)" \
>  		DL_TOOLS="$(sort $(DL_TOOLS_DEPENDENCIES))" \
> -- 
> 2.13.6
>

Hello,

On Fri, 29 Dec 2017 16:42:28 +0100, Yann E. MORIN wrote:

> > +ifeq ($(BR2_CCACHE),y)
> > +ifeq ($(filter host-tar host-skeleton host-xz host-lzip,$(1)),)
> > +$(2)_DEPENDENCIES += host-ccache  
> 
> Sorry, I must be dumb, but I don't see where you exclude host-ccache
> from being its own dependency...

Good point. It's make that does it for me:

make[1]: Circular /home/thomas/projets/buildroot/output/build/host-ccache-3.3.4/.stamp_configured <- host-ccache dependency dropped.

 :-)

I'll fix that in the next iteration. Thanks!

Thomas