[Buildroot] [PATCH 04/18] infra: move ccache handling to the toolchain wrapper

[Romain Naour <romain.naour@openwide.fr>]

Hi Arnout,

Le 20/09/2015 20:41, Arnout Vandecappelle (Essensium/Mind) a ?crit :
> Since we always have a toolchain wrapper now, we can move the ccache
> call to the toolchain wrapper.
> 
> The hostcc ccache handling obviously stays.
> 
> The global addition of ccache to TARGET_CC/CXX is removed, but many
> individual packages and infras still add it. This means we have a
> chain like this: ccache -> toolchain-wrapper -> ccache -> gcc
> However, this is fairly harmless: for cache misses, the inner ccache
> just adds overhead and for cache hits, the inner ccache is never
> called. Later patches will remove these redundant ccache calls.
> 
> As a side effect, perl now supports ccache as well.
> 
> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
> Cc: Danomi Manchego <danomimanchego123@gmail.com>
> Cc: K?roly Kasza <kaszak@gmail.com>

Reviewed-by: Romain Naour <romain.naour@openwide.fr>

Best regards,
Romain

> ---
>  package/Makefile.in            | 5 -----
>  toolchain/toolchain-wrapper.c  | 5 ++++-
>  toolchain/toolchain-wrapper.mk | 4 ++++
>  3 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/package/Makefile.in b/package/Makefile.in
> index 545694f..4b1ce7f 100644
> --- a/package/Makefile.in
> +++ b/package/Makefile.in
> @@ -189,11 +189,6 @@ TARGET_OBJDUMP  = $(TARGET_CROSS)objdump
>  TARGET_CC_NOCCACHE  := $(TARGET_CC)
>  TARGET_CXX_NOCCACHE := $(TARGET_CXX)
>  
> -ifeq ($(BR2_CCACHE),y)
> -TARGET_CC  := $(CCACHE) $(TARGET_CC)
> -TARGET_CXX := $(CCACHE) $(TARGET_CXX)
> -endif
> -
>  ifeq ($(BR2_STRIP_strip),y)
>  STRIP_STRIP_DEBUG := --strip-debug
>  STRIP_STRIP_UNNEEDED := --strip-unneeded
> diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c
> index f3ff04f..4774692 100644
> --- a/toolchain/toolchain-wrapper.c
> +++ b/toolchain/toolchain-wrapper.c
> @@ -40,6 +40,9 @@ static char sysroot[PATH_MAX];
>  #define EXCLUSIVE_ARGS	3
>  
>  static char *predef_args[] = {
> +#ifdef BR_CCACHE
> +	BR_CCACHE,
> +#endif
>  	path,
>  	"--sysroot", sysroot,
>  #ifdef BR_ABI
> @@ -251,7 +254,7 @@ int main(int argc, char **argv)
>  		}
>  	}
>  
> -	if (execv(path, args))
> +	if (execv(args[0], args))
>  		perror(path);
>  
>  	free(args);
> diff --git a/toolchain/toolchain-wrapper.mk b/toolchain/toolchain-wrapper.mk
> index 8e8a445..ab8215d 100644
> --- a/toolchain/toolchain-wrapper.mk
> +++ b/toolchain/toolchain-wrapper.mk
> @@ -17,6 +17,10 @@ TOOLCHAIN_WRAPPER_ARGS += -DBR_SYSROOT='"$(STAGING_SUBDIR)"'
>  # toolchain wrapper.
>  TOOLCHAIN_WRAPPER_ARGS += -DBR_ADDITIONAL_CFLAGS='$(foreach f,$(call qstrip,$(BR2_TARGET_OPTIMIZATION)),"$(f)",)'
>  
> +ifeq ($(BR2_CCACHE),y)
> +TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE='"$(CCACHE)"'
> +endif
> +
>  # For simplicity, build directly into the install location
>  define TOOLCHAIN_BUILD_WRAPPER
>  	$(Q)mkdir -p $(HOST_DIR)/usr/bin
>