[OE-core] [PATCH 3/4] base/bbclass: use target path as include dir in debugging info

[Hongxu Jia]

In debugging information, it uses target paths rather than
build ones as include dir.

Compile without this fix:
objdump -g git/test.o
...
 The Directory Table (offset 0x1b):
|  1     /buildarea/raid0/hjia/build-20160119-yocto-buildpath/tmp/sysroots/x86_64-linux/usr/lib/
i686-pokymllib32-linux.lib32-gcc-cross-initial-i686/gcc/i686-pokymllib32-linux/5.3.0/include
|  2     /buildarea/raid0/hjia/build-20160119-yocto-buildpath/tmp/sysroots/lib32-qemux86-64/usr/include/bits
|  3     /buildarea/raid0/hjia/build-20160119-yocto-buildpath/tmp/sysroots/lib32-qemux86-64/usr/include
...

Compile with this fix:
objdump -g git/test.o
...
 The Directory Table (offset 0x1b):
|  1     /usr/lib/i686-pokymllib32-linux.lib32-gcc-cross-initial-i686/gcc/i686-pokymllib32-linux/
5.3.0/include
|  2     /usr/include/bits
|  3     /usr/include
...

[YOCTO #7058]

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta/classes/base.bbclass | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index e05552c..5c95cba 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -91,6 +91,11 @@ def debug_prefix_map(d):
         buildsrc = d.getVar("S", True)
         targetsrc = "/usr/src/%s" % d.getVar("BPN", True)
         opts += " -fdebug-prefix-map=%s=%s" % (buildsrc, targetsrc)
+
+        for var in ["STAGING_DIR_NATIVE", "STAGING_DIR_HOST"]:
+            buildinc = d.getVar(var, True)
+            opts += " -fdebug-prefix-map=%s=" % (buildinc)
+
         opts += " -gno-record-gcc-switches"
     return opts
 
-- 
1.9.1