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Fix the CC_CHECK_FLAG_APPEND macro to test appended flags in context to
current flag values. Otherwise, it is possible to append flags colliding
with user's *FLAGS or even previously appended flags that will cause
the build to fail.
gcc versions 4.6 and earlier used to complain when a local variable
shadows a global function, 4.7 and above only complain if a local
variable shadows a global variable.
Fix this by checking whether gcc 4.7+ behavior is in place before
deciding to use -Werror=shadow in $(CFLAGS), by using a custom test
program source that shadows a global function with a local variable and
confirming that -Werror=shadow does not make the compile to break.
Tested:
- On gcc 4.7 and 4.8, confirmed nothing changed (other than the order of
the -Werror=shadow argument, going to the end of CFLAGS.)
- On gcc 4.6, confirmed by looking at the config.log output that the
check for -Werror=shadow failed and it was not included in CFLAGS.
- Ran `make V=1` to confirm -Werror=shadow was still in use, introduced
a bogus shadowing issue and confirmed it was caught when building with
a recent gcc.
The variables should be quoted inside [...] to avoid double macro
expansion. This is currently not an issue, since the values (-W...) are
not really macros, but we might as well just fix that issue now.
Tested by re-running autogen.sh and comparing the value of OUR_CFLAGS in
the generated Makefile. Ran a full build from a clean tree to confirm
no other issues were introduced.
Strip trailing slashes from options such as --with-rootprefix, so that building
with rootprefix="/" results in paths like "/lib" instead of "//lib".
Also handle paths such as "/usr/" gracefully.
Use m4/ax_normalize_path.m4 from the autoconf-archive project, which is now
included in our tree as per usual practices in using autoconf-archive macros.
Tested with the following configure options:
./configure \
--with-rootprefix=/ \
--with-rootlibdir=/lib64/ \
--prefix=/usr/ \
--libdir=/lib/ \
--with-bashcompletiondir=/bash-completion/completions/
(The "prefix" and "libdir" are already automatically normalized by Autoconf,
this command is testing the others.)
Compared the config.log and resulting trees (in particular man pages) to
confirm double slashes were not present in the latter.
Also tested that a configuration using default options is not affected and that
`make distcheck` still works as expected.
gcc does not support testing for negated warnings. See here for details:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63499
This patch changes CC_CHECK_FLAG_APPEND to always test for the non-negated
warnings.
All tests for compiler support were failing with:
/usr/bin/ld: /tmp/ccwnVc2A.o: relocation R_ARM_MOVW_ABS_NC against `a' can not be used when making a shared object; recompile with -fPIC
tcpwrap is legacy code, that is barely maintained upstream. It's APIs
are awful, and the feature set it exposes (such as DNS and IDENT
access control) questionnable. We should not support this natively in
systemd.
Hence, let's remove the code. If people want to continue making use of
this, they can do so by plugging in "tcpd" for the processes they start.
With that scheme things are as well or badly supported as they were from
traditional inetd, hence no functionality is really lost.
Use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE to test for flags that
might succeed during compilation but not during linking. An example is gcc
compiled with libssp support but gnu-ld without it. In this case
-fstack-protector works fine during compilation but fails during linking
as several internal helpers are missing.
The affected files in this patch had inconsistent use of tabs vs. spaces
for indentation, and this patch eliminates the stray tabs.
Also, the opening brace of sigchld_hdl() in activate.c was moved so the
opening braces are consistent throughout the file.
Clang don't treat unknown warnings flags as an error, but rather as a
warning. The result is that the detection for whic CFLAGS are supported
by this compiler will not work, since the compilation will succeed.
With this patch we now successfully detect clang doesn't support
-Wlogical-op, as opposed to previous behavior:
checking if clang supports flag -Wlogical-op in envvar CFLAGS... no
We use this macro only for LDFLAGS and CFLAGS, so it's safe to stash
-Werror there.
This removes some warnings when bootstrapping. The warnings were introduced
in autoconf 2.68. Reference:
http://www.flameeyes.eu/autotools-mythbuster/forwardporting/autoconf.html
The following code
AC_COMPILE_IFELSE([
<MY C CODE HERE>
], ...)
is changed to
AC_COMPILE_IFELSE(
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([
<MY C CODE HERE>
])], ...)
