106 lines
3.2 KiB
Plaintext
106 lines
3.2 KiB
Plaintext
Short Description
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=================
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log4cplus is a simple to use C++ logging API providing thread-safe,
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flexible, and arbitrarily granular control over log management and
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configuration. It is modeled after the Java log4j API.
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Latest Project Information
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==========================
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The latest up-to-date information for this project can be found at
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http://log4cplus.sourceforge.net. Please submit bugs, patches,
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feature requests, etc. there.
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Current Status
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==============
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This library has now reached "Production" status.
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Tested on the following platforms
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=================================
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- Linux/AMD64 with GCC 4.1.2 and 4.3.2
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- FreeBSD/i386 and AMD64 with GCC 3.4.6, 4.2.1 and 4.3.3
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- Windows XP with MS Visual C++ 8.0, 9.0 and 10.0
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- OpenSolaris 5.11 with Sun C++ 5.10 SunOS_i386 128229-02 2009/09/21,
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with -library=stlport4
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Notes
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=====
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Cygwin/MinGW
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------------
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Some version of GCC (3.4.x and probably some of 4.x series too) on
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Windows (both Mingw and Cygwin) produces lots of warnings of the form
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"warning: inline function 'void foo()' is declared as dllimport:
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attribute ignored." This can be worked around by adding
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-Wno-attributes option to GCC command. Unfortunatelly, not all
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affected version of GCC have this option.
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Threads and signals
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-------------------
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log4cplus is not safe to be used from async signals' handlers. This
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is a property of most threaded programmes in general. If you are
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going to use log4cplus in threaded application and if you want to use
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log4cplus from signal handlers then your only option is to block
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signals in all threads but one that will handle all signals. On POSIX
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platforms, this is possible using the sigwait() call. log4cplus
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enables this approach by blocking all signals in any threads created
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through its threads helpers.
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AIX
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---
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There appears to be a reentracy problem with AIX 5.3 and xlC 8 which
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can result into a deadlock condition in some curcumstances. It is
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unknown whether the problem manifests with other versions of either
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the OS or the compiler, too. The problem was initially reported in a
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bug report #3056687 ([1]).
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The core of the problem is that IBM's/xlC's standard C++ IOStreams
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implementation uses global non recursive lock to protect some of its
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state. The application in the bug report was trying to do logging
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using log4cplus from inside overflow() member function of a class
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derived from std::streambuf class. log4cplus itself uses
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std::ostringstream. This resulted into an attempt to recursivly lock
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the global non recursive lock and a deadlock.
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[1] <https://sourceforge.net/tracker/?func=detail&aid=3056687&group_id=40830&atid=429073>
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Unsupported compilers
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---------------------
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log4cplus does not support too old and broken C++ compilers:
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- Visual C++ prior to 7.1
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- GCC prior to 3.2
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- All Borland/CodeGear/Embarcadero C++ compilers
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Unsupported platforms
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---------------------
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log4cplus requires some minimal set of C and/or C++ library
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functions. Some systems/platforms fail to provide these functions and
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thus log4cplus cannot be supported there:
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- Windows CE - missing implementations of <time.h> functions
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License
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=======
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This library is licensed under the Apache Public License 2.0 and two
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clause BSD license. Please read the included LICENSE file for
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details.
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