According to Gaetan, that's what we really require. And as a bonus point, this makes libevdev build
on RHEL6 out-of-the-box.
CC: Gaetan Nadon <memsize@videotron.ca>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Having libevdev build with profiling enabled by default
leaves profiling files around. Profiling is something that only
libevdev developers should need, so let them enable it
case-by-case.
https://bugzilla.redhat.com/show_bug.cgi?id=1012180
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
http://lists.freedesktop.org/archives/input-tools/2013-September/000332.html
See above a detailed reasoning, but Colin Walters put it this way:
"At a high level, I think components (git repositories) should feel free
to set up default warning flags and possibly use a targeted subset of
-Werror=foo. But please don't inject non-warning flags like this unless
there is a very good reason.
The right way to do -fstack-protector is to have something like
redhat-rpm-config or other global CFLAGS system controlling *all*
components."
Thus, reverting the -fstack-protector flag. This doesn't completely address
Colin's comments, we still use a few other flags. But this one is the one
that causes real headaches, so drop it.
This reverts commit f5e65ea3ce.
We removed this previously due to build failures in:
commit 14ac764ec8
Author: David Herrmann <dh.herrmann@gmail.com>
Date: Mon Sep 9 16:03:41 2013 +0200
build: remove -fstack-protector
Reintroduce it but this time disable it if it's not supported. We use the
CC-flags testing to prevent build-failures on gcc without libssp support.
Cc: Giovanni Campagna <gcampagn@redhat.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Use the CC_CHECK_FLAGS_APPEND() m4 macro to test for availability of
CFLAGS and LFLAGS. It automatically drops the unavailable flags.
This is also used by systemd, so it ought to work with ostree and other
non-standard build-environments.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
0.9.9 is the first released version with fixed ck_assert_* macros that don't do
multiple expansion.
http://sourceforge.net/p/check/code/596/
Reported-by: Martin Minarik <minarik11@student.fiit.stuba.sk>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
If gcc is built without libssp support, it loudly fails linking due to
missing __stack_chk_*() helpers. Unfortunately, gcc isn't smart enough to
disable it automatically.
systemd recently got a CC_CHECK_FLAG_APPEND helper to work around such
issues:
http://cgit.freedesktop.org/systemd/systemd/tree/m4/attributes.m4
I didn't want to add it now, so let's just drop -fstack-protector. If we
want it, we can try adding it later again.
This partially reverts:
commit 43752ec17d
Author: David Herrmann <dh.herrmann@gmail.com>
Date: Sun Sep 1 17:45:04 2013 +0200
Add some gcc/ld optimizations and magic
All other gcc/ld options are kept.
Reported-by: Giovanni Campagna <gcampagn@redhat.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Without that, it becomes impossible to build without gcov.
Signed-off-by: Giovanni Campagna <scampa.giovanni@gmail.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
-g should be set by debugging-options or in the default CFLAGS="", we
shouldn't force it in GCC_CFLAGS.
Reported-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
There are several gcc/ld flags that optimize size and performance without
requiring explicit code changes. In no particular order, this adds:
- gcc -pipe to avoid temporary files and use pipes during compilation
- gcc -fno-common avoids putting uninitialized global variables not
marked as "extern" into a common section. This catches compilation
errors if we didn't mark global variables explicitly as "extern".
- gcc -fno-strict-aliasing allows us to use unions for some binary magic.
Otherwise, -O2 might assume that two different types never point at the
same memory. We currently don't rely on this but it's common practice
so avoid any non-obvious runtime errors later.
- gcc -ffunction-sections and -fdata-sections put each function and
variable into a separate section. This enables ld's --gc-sections to
drop any unused sections (sections which aren't referenced from an
exported section). This is very useful to avoid putting dead code into
DSOs. We can now link any helper function into libevdev and the linker
removes all of them if they're unused.
- gcc -fstack-protector adds small stack-corruption protectors in
functions which have big buffers on the stack (>8bytes). If the
stack-protectors are corrupted, the process is aborted. This is highly
useful to debug stack-corruption issues which often are nearly
impossible to catch without this.
- ld --as-needed drops all linked libraries that are not actually
required by libevdev. So we can link to whatever we want and the linker
will drop everything which is not actually used.
- ld -z now, resolve symbols during linking, not during runtime.
- ld -z relro, add relocation-read-only section. This allows to put
read-only global variables and alike into a read-only section. This is
useful for variables that need a relocation and thus cannot be
explicitly put into a read-only section. This option tells the linker
to mark them read-only after relocations are done. (that's why -z now
makes sense in combination with this)
All of these options are common in other open-source projects, including
systemd and weston. Don't ask me why they are not marked as default..
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
libevdev has no external dependencies and both check and libudev are
only required for running the unit-tests. Make them optional.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Doxygen is bad for man pages, but having an online API documentation
is better and easier to maintain.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Two main goals of this library:
- 'transparently' handle SYN_DROPPED events
- avoid errors in ioctl handling by providing a simpler interface.
Keeps a cached copy of the device for quick querying.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
