Instead of compiling the build tests manually, use autoconf
facilities, so that the results are cached between runs. Also avoid
linking when a simple compile test is enough.
Create a new macro that can be shared between projects to check for
__thread support by the compiler. This macro might come useful for
xine-lib too so I want to keep it separate for easier importing it
over.
Name the defined macro SUPPORT_TLS___THREAD to follow the same style
as the checks from attributes.m4.
Instead of writing custom code to check for cflags checking, import a
copy of attributes.m4 from xine-lib's repository and use the
CC_CHECK_CFLAGS macro.
The advantage lies not only in being able to reduce the custom code in
configure.ac, but also in the fact that the CC_CHECK_CFLAGS macro
caches the results, making ./configure -C quite faster on second run.
Check for the CFLAGS for any compiler and not just GCC, if the
compiler does support the flag it is better to u se it anyway,
otherwise it will be skipped.
Instead of just checking if the compiler supports -std=c99 option,
make use of the autoconf macro for discovering C99. This way other
non-GCC compiler could be used in C99 mode too.
Split acinclude.m4 in multiple macro files.
Let it be known to autoconf and aclocal to use the m4 directory.
Ignore macro files copied or linked by libtool and intltool.
When referring to the xmltoman script srcdir should be requested, or
the build will fail when doing out of tree builds (and the script is
thus not in the build directory).
On changeset f1d2bf8408 support for
libtool 2.2 was broken as libtool_set_error was not defined anymore on
that version. Fix this by also putting under #ifdef the calls to that
function.
The runtime directory is now guaranteed to be in /tmp which will hopefully
provide support for POSIX file locking and UNIX sockets.
The state directory stays in $HOME.
