[OE-core] [PATCH 1/2] busybox.inc: handle empty DEBUG_PREFIX_MAP

[Mikko Rapeli]

DEBUG_PREFIX_MAP can be empty if e.g. old clang
toolchain doesn't support the default poky values for gcc.

Fixes build failure:

ERROR: Logfile of failure stored in: /home/builder/src/base/build/tmp/work/aarch64-poky-linux/busybox/1.31.0-r
0/temp/log.do_configure.14451
Log data follows:
| DEBUG: Executing shell function do_configure
| sed: -e expression #1, char 0: no previous regular expression
| WARNING: exit code 1 from a shell command.
| ERROR: Execution of '/home/builder/src/base/build/tmp/work/aarch64-poky-linux/busybox/1.31.0-r0/temp/run.do_configure.14451' failed with exit code 1:
| sed: -e expression #1, char 0: no previous regular expression
| WARNING: exit code 1 from a shell command.
|

This log entry is really useless for debugging problems so
add "set -x" to the configure script so that details can be seen
if something isn't working.

Signed-off-by: Mikko Rapeli <mikko.rapeli at bmw.de>
---
 meta/recipes-core/busybox/busybox.inc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/recipes-core/busybox/busybox.inc b/meta/recipes-core/busybox/busybox.inc
index 49165d7..956ccca 100644
--- a/meta/recipes-core/busybox/busybox.inc
+++ b/meta/recipes-core/busybox/busybox.inc
@@ -128,7 +128,9 @@ do_prepare_config () {
 		${S}/.config.oe-tmp > ${S}/.config
 	fi
 	sed -i 's/CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n"/CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -b"/' ${S}/.config
-	sed -i 's|${DEBUG_PREFIX_MAP}||g' ${S}/.config
+	if [ -n "${DEBUG_PREFIX_MAP}" ]; then
+		sed -i 's|${DEBUG_PREFIX_MAP}||g' ${S}/.config
+	fi
 }
 
 # returns all the elements from the src uri that are .cfg files
@@ -142,6 +144,7 @@ def find_cfgs(d):
     return sources_list
 
 do_configure () {
+	set -x
 	do_prepare_config
 	merge_config.sh -m .config ${@" ".join(find_cfgs(d))}
 	cml1_do_configure
-- 
1.9.1