[yocto] Building gdb-7.10 for arm with master

[Rudolf J Streif]

At least for arm (I have not tested other arch) building gdb-7.10 with

Build Configuration:                                                                                                                          
BB_VERSION        = "1.29.0"                                                                                                                  
BUILD_SYS         = "x86_64-linux"                                                                                                            
NATIVELSBSTRING   = "Fedora-22"                                                                                                               
TARGET_SYS        = "arm-poky-linux-gnueabi"                                                                                                  
MACHINE           = "beaglebone"                                                                                                              
DISTRO            = "poky"                                                                                                                    
DISTRO_VERSION    = "2.0+snapshot-20160305"                                                                                                   
TUNE_FEATURES     = "arm armv7a vfp  neon        callconvention-hard        cortexa8"                                                         
TARGET_FPU        = "hard"                                                                                                                    
meta                                                                                                                                          
meta-poky                                                                                                                                     
meta-yocto-bsp    = "master:5cd71fe432c9bdfd3ff519543e96e8caa2b7cf6c"                                                                         
meta-oe                                                                                                                                       
meta-python       = "master:36aab3f797630e3de680a88523f40ead4ca95d28"                                                                         
meta-qt5          = "master:88a7f264ef5f64d73881c384d22bf883b2cbf72e"

compile fails with the following error message:

| make[2]: *** No rule to make target '../readline/libreadline.a', needed by 'gdb'.  Stop.
| make[2]: *** Waiting for unfinished jobs....

The reason seems to be a broken path to the built-in readline in the makefile as the default configuration is 
--without-system-readline. Enabling

PACKAGECONFIG_append_pn-dbg = " readline"

solves the problem.

I wonder if anybody else has observed this problem?

Cheers,
Rudi