linux-kernel - Re: [PATCH] tools/thermal: tmon: Allow overriding pkg-config

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Date:	Fri, 7 Aug 2015 16:13:10 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	linux-kernel@...r.kernel.org, rui.zhang@...el.com,
	jacob.jun.pan@...ux.intel.com, gregory.0xf0@...il.com,
	Anand Moon <linux.amoon@...il.com>
Subject: Re: [PATCH] tools/thermal: tmon: Allow overriding pkg-config

On Fri, Aug 07, 2015 at 03:58:02PM -0700, Florian Fainelli wrote:
> Some build systems might not ship with a proper pkg-config
> infrastructure, so picking up the host pkg-config might cause us to link
> with ncursesw which may not be present in the build environment.
> 
> Allow an external build system to override the pkg-config value (e.g:
> set it to /bin/false if we do not have anything).

Is that really the best approach? I see other Makefiles that leave
PKG_CONFIG as a variable (which is fine), but not to allow full
override; they do something like:

PKG_CONFIG := $(CROSS_COMPILE)pkg-config

So, I suppose you could then alias your my-foo-cross-pkg-config to
/bin/false, or something like that.

Another alternative: supply empty $PKG_CONFIG_LIBDIR and
$PKG_CONFIG_PATH variables, so pkg-config finds nothing. (Bonus: no
patch needed here!)

Brian

> Fixes: 96a0d99c72cc ("tools/thermal: tmon: use pkg-config to determine library dependencies")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  tools/thermal/tmon/Makefile | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/thermal/tmon/Makefile b/tools/thermal/tmon/Makefile
> index 2e83dd3655a2..3777ab59d08c 100644
> --- a/tools/thermal/tmon/Makefile
> +++ b/tools/thermal/tmon/Makefile
> @@ -11,6 +11,7 @@ TARGET=tmon
>  
>  INSTALL_PROGRAM=install -m 755 -p
>  DEL_FILE=rm -f
> +PKG_CONFIG?=pkg-config
>  
>  # Static builds might require -ltinfo, for instance
>  ifneq ($(findstring -static, $(LDFLAGS)),)
> @@ -18,8 +19,8 @@ STATIC := --static
>  endif
>  
>  TMON_LIBS=-lm -lpthread
> -TMON_LIBS += $(shell pkg-config --libs $(STATIC) panelw ncursesw 2> /dev/null || \
> -		     pkg-config --libs $(STATIC) panel ncurses 2> /dev/null || \
> +TMON_LIBS += $(shell $(PKG_CONFIG) --libs $(STATIC) panelw ncursesw 2> /dev/null || \
> +		     $(PKG_CONFIG) --libs $(STATIC) panel ncurses 2> /dev/null || \
>  		     echo -lpanel -lncurses)
>  
>  OBJS = tmon.o tui.o sysfs.o pid.o
> -- 
> 2.1.0
> 
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