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separateDebugInfo: Compress debug sections at compile/link time

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This commit is contained in:
Eelco Dolstra 2016-02-28 01:54:55 +01:00
parent 2040a9ac57
commit 69a337edae
1 changed files with 3 additions and 11 deletions
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14
pkgs/build-support/setup-hooks/separate-debug-info.sh
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@ -1,5 +1,5 @@
export NIX_LDFLAGS+=" --build-id" export NIX_LDFLAGS+=" --build-id --compress-debug-sections"
export NIX_CFLAGS_COMPILE+=" -ggdb" export NIX_CFLAGS_COMPILE+=" -ggdb -Wa,--compress-debug-sections"
dontStrip=1 dontStrip=1
fixupOutputHooks+=(_separateDebugInfo) fixupOutputHooks+=(_separateDebugInfo)
@ -25,18 +25,10 @@ _separateDebugInfo() {
# Extract the debug info. # Extract the debug info.
header "separating debug info from $i (build ID $id)" header "separating debug info from $i (build ID $id)"
mkdir -p "$dst/${id:0:2}" mkdir -p "$dst/${id:0:2}"
objcopy --only-keep-debug "$i" "$dst/${id:0:2}/${id:2}.debug" --compress-debug-sections objcopy --only-keep-debug "$i" "$dst/${id:0:2}/${id:2}.debug"
strip --strip-debug "$i" strip --strip-debug "$i"
# Also a create a symlink <original-name>.debug. # Also a create a symlink <original-name>.debug.
ln -sfn ".build-id/${id:0:2}/${id:2}.debug" "$dst/../$(basename "$i")" ln -sfn ".build-id/${id:0:2}/${id:2}.debug" "$dst/../$(basename "$i")"
done < <(find "$prefix" -type f -print0) done < <(find "$prefix" -type f -print0)
} }
# - We might prefer to compress the debug info during link-time already,
# but our ld doesn't support --compress-debug-sections=zlib (yet).
# - Debug info may cause problems due to excessive memory usage during linking.
# Using -Wa,--compress-debug-sections should help with that;
# further interesting information: https://gcc.gnu.org/wiki/DebugFission
# - Another related tool: https://fedoraproject.org/wiki/Features/DwarfCompressor