Automake older than version 1.11 does not support dist-xz. No workaround
possible via a feature check, as far as I can tell.

Failed *SUSE checks.

Fixes: ArcticaProject/nx-libs#596

Fixes ArcticaProject/nx-libs#530

Fixes this:

CXX      Loop.lo
Loop.cpp: In function 'void handleCheckResultInLoop(int&, int&, int&, fd_set&, fd_set&, timeval&, timeval&)':
Loop.cpp:14080:68: warning: declaration of 'startTs' shadows a global declaration [-Wshadow]
                                             struct timeval &startTs)
                                                                    ^
Loop.cpp:1020:13: note: shadowed declaration is here
T_timestamp startTs;

Fixes ArcticaProject/nx-libs#545

Should be used instead of free() calls and will clear the pointer after
calling free(). This can prevent double-free or use-after-free errors.

The thread specific stringstream objects on the stack need to be
deleted, not just pop()ed.

Fixes ArcticaProject/nx-libs#573 (partially)

free() can handle NULL itself

Fixes ArcticaProject/nx-libs#569

Some functions' return values are never used anywhere, so drop them.

This corrects a flaw that stayed undetected for 2.5 years, introduced via
c5a2cf82

Fixes ArcticaProject/nx-libs#573

Fixes: ArcticaProject/nx-libs#536

Allowing overrides via NX_TEMP and TEMP breaks system using
pam_tmpdir.so and most server infrastructure expects the location to be
fixed anyway.

Regression fix for f855b3b6. Caused FTBFS with Loop.cpp:2669:0: error: unterminated #ifdef (#ifdef TIME).

Needs more sophisticated features to actually test stuff correctly.

DO NOT USE!

The default function we use (if a thread name is not specified
explicitly) is pthread_self(). This function returns a number that is
guaranteed to be unique for each thread within a process, but this
assertion doesn't hold globally. Hence only using the thread ID is
ambiguous when logging from multiple processes.

Prevents race conditions caused by signal handlers while flushing out
our log queue.

This has one drawback: after flushing log data to its underlying output,
a new NXLogStamp object MUST be written to the NXLog object in order to
create a new entry within the stack.

This can be changed if necessary. For now I'd like to keep it as-is.

nxcomp/{configure.ac,Log.cpp}: implement configure-time std::put_time check and use macro value in Log.cpp.

This is to ensure the log output is the same as previous releases,
which didn't have INFO defined by default.

Features:
	* Works without ifdefs
	* Configurable with commandline arguments
	* Log level configurable per file
	* Thread safe

nx{comp{,shad},proxy}: add configure flag --enable-cxx11 to enable and setup optional C++11 support.

Use AX_CXX_COMPILE_STDCXX(_11) from autotools archive.

Note: should only be used in tandem. Make sure that each component
either uses the C++11 ABI or none uses it. Mixing and matching libraries
and binaries with different C++ ABIs might lead to weird errors.