Release 1.3.1 (2026-03-19):
---------------------------
 * Build system maintenance: update feature test macros to _XOPEN_SOURCE=800,
   to incorporate the posix standard POSIX.1-2024. Remove explicitly set
   feature test macros from private code, feature test macro is set via
   a preprocessor flag during build. Move minimum required automake version
   from individual Makefile templates to the automake initialization in
   configure.ac
Release 1.3 (2026-02-06):
-------------------------
 * Changed license from GPL-2.0-or-later to LGPL-2.1-or-later
 * Cleanup of header file include directives following the include what you
   use (IWYU) paradigm for all modules except cxstring. The latter is likely
   causing issues in downstream code and will be cleaned up after a grace
   period in the next version. This cleanup of header file inclusion may
   require changes in the header file include directives in code using
   libcext. Implementations making calls to libcext functions shall make
   sure that the corresponding header file is explicitly included. 
 
Release 1.2.7 (2026-01-26):
---------------------------
 * Build system update: add configure option to enable address sanitizer
   instrumentation
 * Cleanup of compiler warnings

Release 1.2.6 (2023-04-14):
---------------------------
 * Build system update: avoid configure tests to appear failing because of
   recent compilers bailing out on prototypes in autoconf generated test code.
 * Updated fallback vsnprintf implementation to fix an overflow error that
   can occur in rare cases.
 * Added macros ESO_ENABLE_TSAN() and ESO_ENABLE_ASAN() to support building
   with sanitizer support.

Release 1.2.5 (2023-04-03):
---------------------------
 * Build system fixes and improvements.

Release 1.2.4 (2020-04-14):
---------------------------
 * Minor reference documentation fixes.

Release 1.2.3 (2019-02-18):
---------------------------
 * Build system updates.
 * eso.m4: removed definition of symbol 'strdup' from ESO_FUNC_STRDUP() if it
   is not found on the system. This makes the macro a pure test and the
   caller is responsible for acting on the result.
 * Cleanup of compiler warnings.

Release 1.2.2 (2017-11-21):
---------------------------
 * Reference documentation updates.
 * Build system updates.
 * Cleanup of compiler warnings in unit tests.

Release 1.2.1 (2015-07-20):
---------------------------
 * cx_deque, cxutils.c: Bug fixes.

Release 1.2 (2015-03-06):
-------------------------
 * cx_string: New functions added.
 * Minor documentation cleanup.  
