The `\0` being used to refer to the whole match is a GNU
extension. On other implementations of sed, this will simply
replace the each matched line with ` 0;`, resulting in symbols
being missing in the NetworkManager executable, which breaks the
wifi plugin and others.
Use `&` instead, which behaves as expected in all implementations.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1562
Better fix for https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/732
The original issue was that when compiling NetworkManager with slibtool
the create-exports-NetworkManager.sh script gave the NetworkManager-all-sym
slibtool wrapper script to nm(1) instead of the actual binary. This is
because slibtool and GNU libtool do not place the compiled programs in
the same location. The original fix was to test both locations, but this
is bit of a hack especially since the build system should not be using the
.libs directory directly. However with $(LIBTOOL) --mode=execute this is
not a problem since both implementations can figure out where the correct
binary is.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/805
Currently "src/" mostly contains the source code of the daemon.
I say mostly, because that is not true, there are also the device,
settings, wwan, ppp plugins, the initrd generator, the pppd and dhcp
helper, and probably more.
Also we have source code under libnm-core/, libnm/, clients/, and
shared/ directories. That is all confusing.
We should have one "src" directory, that contains subdirectories. Those
subdirectories should contain individual parts (libraries or
applications), that possibly have dependencies on other subdirectories.
There should be a flat hierarchy of directories under src/, which
contains individual modules.
As the name "src/" is already taken, that prevents any sensible
restructuring of the code.
As a first step, move "src/" to "src/core/". This gives space to
reorganize the code better by moving individual components into "src/".
For inspiration, look at systemd's "src/" directory.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/743
Despite `set -e`, the shell script does not fail if the command in the
here document fails. This can happen if binutils' "nm" fails.
NM=/bin/false "./tools/create-exports-NetworkManager.sh" --called-from-build "."
(cherry picked from commit 7fe76f54e3)
We use a linker version script "NetworkManager.ver", to hide
symbols from NetworkManager that are not used. That is important
due to our habit of using internal helper libraries that we link
statically everywhere, without handpicking the symbols we actually
need. We want the tooling to get rid of unnecessary symbols.
However, NetworkManager loads shared libraries for settings and device
plugins. These libraries require symbols from the NetworkManager binary,
but which one depends on build options. Hence, we also generate
"NetworkManager.ver" by the "tools/create-exports-NetworkManager.sh"
script.
For that the script uses "nm" to find symbols that are undefined in the
plugin libraries but defined in NetworkManager. With autotools the
script looked at "./src/.libs/libNetworkManager.a" to find the present
symbols. Note that for meson that already didn't work, and we build
instead an intermediate NetworkManager binary first (with all symbols
exposed). With LTO, "nm" doesn't find all symbols in
"./src/.libs/libNetworkManager.a", and consequently they are not
exported and dropped/hidden.
This also causes unit tests to fail with LTO, because our test script
"tools/check-exports.sh" catches such bugs.
Fix that by also with autotools generate a complete "NetworkManager-all-sym"
binary that is used to generate "NetworkManager.ver", before rebuilding
"NetworkManager" again.
The functionality of the ibft settings plugin is now handled by
nm-initrd-generator. There is no need for it anymore, drop it.
Note that ibft called iscsiadm, which requires CAP_SYS_ADMIN to work
([1]). We really want to drop this capability, so the current solution
of a settings plugin (as it is implemented) is wrong. The solution
instead is nm-initrd-generator.
Also, on Fedora the ibft was disabled and probably on most other
distributions as well. This was only used on RHEL.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1371201#c7
When building with meson -Dppp=false, the following message is printed
during build:
[623/671] Generating NetworkManager.ver with a custom command. find: ‘./src/ppp/’: No such file or directory
The message is harmless. Hide it.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/issues/43
The script didn't include all the symbols needed by plugins because
libNetworkManager.a, as built by meson, doesn't include symbols from
other static libraries that are linked in. Since we used
libNetworkManager.a to know which symbols are potentiall available
from NM, the result was an incomplete list.
Unfortunately, the only way to include the whole static library is to
create a dependency object and use 'link_whole', but this is only
available in meson >= 0.46. Since 'link_whole' is available for
executables in meson >= 0.40, create a fake executable and use that to
enumerate symbols.
Also add tests to check that plugins can be loaded correctly.
Fixes: dfa2a2b40c
NetworkManager.ver needs to whitelist symbols needed by device,
settings, and ppp plugin. Fix the generator script to also allow
using c_siphash_*() symbols. These are needed by nm_hash_*().
Without this, wifi device plugin is broken.
Fixes: ccf36ff4ce
Even Gentoo disables this plugin since before 0.9.8 release
of NetworkManager. Time to say goodbye.
If somebody happens to show up to maintain it, we may resurrect it
later.
If "$distro_plugins=ifnet" was set, configure.ac would use that
to autodetect --with-hostname-persist=gentoo. Replace that autodetect
part by checking for /etc/gentoo-release file.
On ppc archtecture the "nm_bt_vtable_network_server" symbol in the small
objects section instead of .bss, represencted by a "S" letter. Also
include "G" which is an equivalent thing for initialized data. We don't
seem to have such objects at the moment, but when we do it could result
in a nasty surprise.
When building with -flto, we need to use linker plugins.
In case of binutils' nm, it means to prefer gcc-nm if
available.
Like for ranlib and ar, prefer gcc-nm.
- replace AC_PATH_TOOL() by AC_CHECK_TOOLS(). That is consistent
with what we do for ar,ranlib and suggested on bgo#783311.
- instead of using the variable $BINUTILS_NM, replace it by
$NM, which is more common according to bgo#783311.
- Keep recognizing $BINUTILS_NM environment, which was introduced
by commit 8bc88bcc7c. This is purely to keep previous build
scripts working. Originally I named it "$BINUTILS_NM" because
using $NM in NetworkManager seemed confusing. But well...
https://bugs.gentoo.org/show_bug.cgi?id=620052https://bugzilla.gnome.org/show_bug.cgi?id=782525https://bugzilla.gnome.org/show_bug.cgi?id=783311
`nm` is used by "tools/create-exports-NetworkManager.sh" script.
Alloc configuring an explicit path during configure.
BINUTILS_NM=/usr/bin/nm ./configure
Generating "src/NetworkManager.ver" each time seems to work well.
Thus, src/NetworkManager.ver-orig is unused an gets easily out
of date. Just remove it. It's not useful anymore.
Moving the PPP manager to a separate plugin that is loaded when needed
has the advantage of slightly reducing memory footprint and makes it
possible to install the PPP support only where needed.
https://bugzilla.gnome.org/show_bug.cgi?id=773482
This adds 0.4 seconds to the build time.
You can disable it by setting $NM_BUILD_NO_CREATE_EXPORTS environment
variable. This is useful in the unexpected case that the script
is broken.
Or, if you just want to use a different, non-generated version-script.
Or, if you want to save 0.4 seconds build-time.
- include symbols from the "B" section.
- improve the script, to use libNetworkManager.a instead
of the NetworkManager binary. The former is before stripping
symbols.
- 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.
