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Just remapping TMPDIR to TARGET_DBGSRC_DIR results in the files that end up in the -src package containing lines such as #line 196 "/usr/src/debug/fluentbit/4.0.1//work/cortexa76-oe-linux/fluentbit/4.0.1/sources/fluentbit-4.0.1/lib/cmetrics/src/cmt_decode_prometheus.l" #line 1561 "/usr/src/debug/fluentbit/4.0.1//work/cortexa76-oe-linux/fluentbit/4.0.1/build/lib/cmetrics/cmt_decode_prometheus_parser.c" By instead remapping both B and S, we strip more of the irrelevant part of WORKDIR, and one ends up with line directives in the -src package that actually match the source files' location in that package: #line 196 "/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/src/cmt_decode_prometheus.l" #line 1561 "/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/cmt_decode_prometheus_parser.c" $ find packages-split/fluentbit-src/ -name cmt_decode_prometheus*.[cl] | sort packages-split/fluentbit-src/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/cmt_decode_prometheus_lexer.c packages-split/fluentbit-src/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/cmt_decode_prometheus_parser.c packages-split/fluentbit-src/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/src/cmt_decode_prometheus.c packages-split/fluentbit-src/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/src/cmt_decode_prometheus.l packages-split/fluentbit-src/usr/src/debug/fluentbit/4.0.1/lib/cmetrics/src/cmt_decode_prometheus_remote_write.c and that also matches the remapping that the compiler is instructed to do via the -ffile-prefix-map mechanism. Signed-off-by: Rasmus Villemoes <ravi@prevas.dk> Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>