mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager
synced 2024-07-23 03:04:18 +00:00
b171fbc9ca
- this allows the linker to drop unused symbols via link-time optimization
or with --gc-sections:
git clean -fdx
./autogen.sh --enable-ld-gc --enable-ifcfg-rh --enable-ifupdown \
--enable-ifnet --enable-ibft --enable-teamdctl --enable-wifi \
--with-modem-manager-1 --with-ofono --with-more-asserts \
--with-more-logging
make -j20
strip ./src/NetworkManager
gives 2822840 vs. 2625960 bytes (-7%).
- this also gives more control over the symbols that are used by the
plugins. Yes, it means if you modify a plugin to use a new symbols,
you have to extend NetworkManager.ver file.
You can run the script to create the version file:
$ ./tools/create-exports-NetworkManager.sh update
but be sure that your current configuration enables all plugins
and debugging options to actually use all symbols that are in use.
- If you compile with certain plugins enabled, you could theoretically
re-compile NetworkManager to expose less symbols. Try:
$ ./tools/create-exports-NetworkManager.sh build
- note that we have `make check` tests to ensure that all used
symbols of the plugins can be found. So, it should not be possible
to accidentally forget to expose a symbol.
105 lines
1.9 KiB
Bash
Executable file
105 lines
1.9 KiB
Bash
Executable file
#!/bin/bash
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set -e
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# generates the linker version script src/NetworkManager.ver
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# by looking at the symbols needed by the device and settings
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# plugins. Note that this depends on how NetworkManager and
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# the plugins are build. For example, compiling without
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# --with-more-asserts will yield less symbols.
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#
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# _build re-builds NetworkManager with relevant compile time
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# options to yield the most symbols.
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_build() {
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git clean -fdx
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./autogen.sh --enable-ld-gc --enable-ifcfg-rh --enable-ifupdown \
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--enable-ifnet --enable-ibft --enable-teamdctl --enable-wifi \
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--with-modem-manager-1 --with-ofono --with-more-asserts \
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--with-more-logging
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make -j20
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}
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_sort() {
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LANG=C sort -u
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}
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call_nm() {
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nm "$1" |
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sed -n 's/^................ \(.\) \(.*\)$/\1 \2/p'
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}
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get_symbols_nm () {
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call_nm ./src/NetworkManager |
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sed -n 's/^[tTDR] //p' |
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_sort
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}
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get_symbols_explict() {
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cat <<EOF | _sort
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_IO_stdin_used
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EOF
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}
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get_symbols_missing() {
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(for f in ./src/settings/plugins/*/.libs/*.so ./src/devices/*/.libs/*.so; do
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call_nm "$f" |
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sed -n 's/^\([U]\) \(\(nm_\|nmp_\|_nm\|NM\|_NM\).*\)$/\2/p'
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done) |
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_sort |
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grep -Fx -f <(get_symbols_explict) -v |
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grep -Fx -f <(get_symbols_nm)
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}
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pretty() {
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sed 's/.*/\t\0;/'
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}
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do_build() {
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do_update
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touch src/main.c
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make
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}
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do_rebuild() {
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_build
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do_build
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}
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do_update() {
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do_generate > ./src/NetworkManager.ver
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}
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do_generate() {
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cd "$(realpath $(dirname "$0"))/.."
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test -f ./src/NetworkManager
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cat <<EOF
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# this file is generated by $0
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{
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global:
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$(get_symbols_missing | pretty)
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$(get_symbols_explict | pretty)
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local:
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*;
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};
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EOF
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}
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case "$1" in
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rebuild)
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do_rebuild
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;;
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build)
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do_build
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;;
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update)
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do_update
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;;
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*)
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do_generate
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;;
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esac
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