Configuration Information [Automatically generated, do not change]:
Machine: arm
OS: linux-gnueabi
Compiler: arm-cortex_a8-linux-gnueabi-gcc -march=armv7-a -mtune=cortex-a8
-mfpu=neon -mfloat-abi=softfp -mlittle-endian
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='arm'
-DCONF_OSTYPE='linux-gnueabi' -DCONF_MACHTYPE='arm-cortex_a8-linux-gnueabi'
-DCONF_VENDOR='cortex_a8' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H -I.
-I/home/dkehn/current/u/src/user/bash/bash-4.2-20-src.d
-I/home/dkehn/current/u/src/user/bash/bash-4.2-20-src.d/include
-I/home/dkehn/current/u/src/user/bash/bash-4.2-20-src.d/lib -Wall
-I/opt/x-tools/arm-cortex_a8-linux-gnueabi-20111101/arm-cortex_a8-linux-gnueabi/sysroot/usr/include
-I/home/dkehn/current/u/src/user/bash/../../build.d/0001-0001/build-root/usr/include
uname output: Linux none 2.6.37 #1 Tue Feb 14 10:07:19 CST 2012 armv7l GNU/Linux
Machine Type: arm-cortex_a8-linux-gnueabi
Bash Version: 4.2
Patch Level: 20
Release Status: release
Description:
When cross-compiling bash_cv_job_control_missing gets set to
missing (bash_cv_job_control_missing=missing) because job
control can't be validated. Without job control using '|'
results in a unwind_frame_discard warning.
# echo hello | grep hello
hello
-sh: warning: unwind_frame_discard: lastpipe-exec: frame not found
Repeat-By:
Compile bash without job control. Then execute:
echo hello | grep hello
Fix:
When cross-compiling, passing
bash_cv_job_control_missing=present to configure enables job
control and prevents the warning from being emitted.
In execute_cmd.c, execute_pipeline() calls
begin_unwind_frame ("lastpipe-exec"). This call is wrapped by a
#if defined (JOB_CONTROL). At the end of execute_pipeline(), a
call is made to discard_unwind_frame ("lastpipe-exec"). This
call is always executed. It should probably be wrapped by a
#if defined (JOB_CONTROL).
