I use cscope in emacs as my primary code browsing tool for Linux
kernel development. However, I started to get annoyed by cscope
errors for broken symlinks. What is happening is that during the Linux
kernel build process, a few symlinks get created which are not needed
once the kernel is built. I presume that the build tooling doesn't
clean up these symlinks after they are removed and that confuses the
cscope program. This results in the following annoying messages when I
try to lookup definition or text or anything:
======================================================================
Finding symbohttp:// EXT4_FC_TAG_LINK
Database directory: /usr/local/google/home/harshads/repo/github-harshadjs-linux/
cscope: cannot find file include/dt-bindings/input/linux-event-codes.h
cscope: cannot find file include/dt-bindings/clock/qcom,dispcc-sm8150.h
cscope: cannot find file tools/testing/selftests/powerpc/nx-gzip/include/vas-api.h
cscope: cannot find file tools/testing/selftests/powerpc/vphn/vphn.c
cscope: cannot find file tools/testing/selftests/powerpc/vphn/asm/lppaca.h
cscope: cannot find file tools/testing/selftests/powerpc/primitives/asm/ppc_asm.h
cscope: cannot find file tools/testing/selftests/powerpc/primitives/asm/asm-compat.h
cscope: cannot find file tools/testing/selftests/powerpc/primitives/asm/feature-fixups.h
cscope: cannot find file tools/testing/selftests/powerpc/primitives/asm/asm-const.h
cscope: cannot find file tools/testing/selftests/powerpc/primitives/word-at-a-time.h
fs/ext4/fast_commit.h:
<global>[10] #define EXT4_FC_TAG_LINK 0x0004
fs/ext4/fast_commit.c:
__ext4_fc_track_link[443] args.op = EXT4_FC_TAG_LINK;
ext4_fc_replay_link[1360] trace_ext4_fc_replay(sb, EXT4_FC_TAG_LINK, darg.ino,
tag2str[1776] case EXT4_FC_TAG_LINK:
ext4_fc_replay_scan[1951] case EXT4_FC_TAG_LINK:
ext4_fc_replay[2056] case EXT4_FC_TAG_LINK:
These cannot find file messages get flooded in the cscope tiny buffer. For
now, I have implemented a quick fix where I have added a wrapper around cscope
that directs the messages wrote to stderr to /dev/null. Here's how it looks:
#!/bin/bash
cscope-bin $@ 2>/dev/nullWith this, now the cscope buffer looks pretty again!
======================================================================
Finding symbohttp:// EXT4_FC_TAG_LINK
Database directory: /usr/local/google/home/harshads/repo/github-harshadjs-linux/
fs/ext4/fast_commit.h:
<global>[10] #define EXT4_FC_TAG_LINK 0x0004
fs/ext4/fast_commit.c:
__ext4_fc_track_link[443] args.op = EXT4_FC_TAG_LINK;
ext4_fc_replay_link[1360] trace_ext4_fc_replay(sb, EXT4_FC_TAG_LINK,
darg.ino,
tag2str[1776] case EXT4_FC_TAG_LINK:
ext4_fc_replay_scan[1951] case EXT4_FC_TAG_LINK:
ext4_fc_replay[2056] case EXT4_FC_TAG_LINK: