[Buildroot] libkrb5: Add check for TCL

[Baruch Siach]

Hi André,

On Tue, Apr 03, 2018 at 06:59:03PM +0200, André Hentschel wrote:
> Signed-off-by: André Hentschel <nerv at dawncrow.de>
> ---
>  package/libkrb5/libkrb5.mk | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/package/libkrb5/libkrb5.mk b/package/libkrb5/libkrb5.mk
> index 88cfc61..70de82b 100644
> --- a/package/libkrb5/libkrb5.mk
> +++ b/package/libkrb5/libkrb5.mk
> @@ -48,6 +48,13 @@ else
>  LIBKRB5_CONF_OPTS += --without-readline
>  endif
>  
> +ifeq ($(BR2_PACKAGE_TCL),y)
> +LIBKRB5_CONF_OPTS += --with-tcl
> +LIBKRB5_DEPENDENCIES += tcl
> +else
> +LIBKRB5_CONF_OPTS += --without-tcltk
> +endif

Build fails for me here:

checking for tclConfig.sh... not found
configure: WARNING: trying old tcl search code
checking tcl.h usability... yes
checking tcl.h presence... yes
checking for tcl.h... yes
checking tcl/tcl.h usability... no
checking tcl/tcl.h presence... no
checking for tcl/tcl.h... no
checking for Tcl_CreateCommand in -ltcl8.0... no
checking for Tcl_CreateCommand in -ltcl7.6... no
checking for Tcl_CreateCommand in -ltcl7.5... no
checking for Tcl_CreateCommand in -ltcl... no
configure: WARNING: "tcl.h found but not library"
configure: error: Could not find Tcl

I'm using the defconfig for the failed build at

  http://autobuild.buildroot.net/results/d11/d118c3c09f6fc1de26491f2ed480ef28b091dba8/

I also tried --with-tcl="$(STAGING_DIR)/usr" but the result is the same:

checking for tclConfig.sh... .../output/host/i686-buildroot-linux-uclibc/sysroot/usr/lib/tclConfig.sh
checking Tcl info in .../output/host/i686-buildroot-linux-uclibc/sysroot/usr/lib/tclConfig.sh... 8.6 - compilation failed
configure: WARNING: trying old tcl search code
...

It turns out that tclConfig.sh causes '-L/usr/lib' to be added to LDFLAGS. 
This is incompatible with cross-compilation.

baruch

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