https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70268
--- Comment #3 from hongxu jia <hongxu.jia at windriver dot com> --- (In reply to Richard Biener from comment #2) > IMHO it doesn't make sense to prune system header paths here and having them > is desired. Hi Richard, It is just a simple example to explain the requirements. In our OpenEmbedded project, we do many cross complication, and have very complex build path. Here is the actual use of option '-fdebug-prefix-map' in our project: DEBUG_FLAGS="-g -feliminate-unused-debug-types -fdebug-prefix-map=/buildarea/raid0/hjia/build-20160316-yocto-buildpath-2/tmp/work/core2-64-poky-linux/service/0.1-r0/service-0.1=/usr/src/service -fdebug-prefix-map=/buildarea/raid0/hjia/build-20160316-yocto-buildpath-2/tmp/work/core2-64-poky-linux/service/0.1-r0/service-0.1=/usr/src/service -fdebug-prefix-map=/buildarea/raid0/hjia/build-20160316-yocto-buildpath-2/tmp/sysroots/x86_64-linux= -fdebug-prefix-map=/buildarea/raid0/hjia/build-20160316-yocto-buildpath-2/tmp/sysroots/qemux86-64= " //Hongxu
