Version 2.2.2, Dec 18, 2018

    * GxB_print: better output for compile-time user objects
    * bug fix: for GxB_Type_define, for GrB_*_build.
    * bug fix: for GxB_Semiring_define, which was unable to access
        the predefined GxB_*_BOOL_MONOIDs.

Version 2.2.0, Nov 29, 2018

    * identical to 2.2.0 (BETA4): date changed, and "BETA4" removed.
        Demo/choldemo removed (testing artifact, not needed).

Version 2.2.0 (BETA4), Nov 28, 2018

    * minor change to GxB_get, GxB_set (all functions using va_arg):
        const removed from parameter definitions to silence spurious warnings
        from clang version 10.0.0, Mac OSX 10.14.
    * added Doc/CONTRIBUTOR-LICENSE.txt
    * added Doc/README_Doc.txt: includes instructions for OpenMP on the Mac
    * minor changes to comments of GB_subref_template: to match the ACM TOMS
        paper discussion of GrB_extract
    * included the GraphBLAS Extras: triangle counting, k-truss, and
        Kronecker matrix generator
    * minor changes for gcc -Wall -Wpedantic -Wextra, and icc -w3: to fix or
        silence warnings.  In a few cases, prior versions were relying on
        extensions to the ANSI C11 standard in gcc, clang, xlc.  The extensions
        are widely supported but best avoided anway.

Version 2.2.0 (BETA3), Nov 23, 2018

    * removed persistent thread-local O(n) workspace:  the Mark,
        Flag, and Work arrays in GB_thread_local in prior versions are removed.
        Replaced with temporary workspace, except for C=A*B using Gustavson's
        method, which now uses the C->Sauna workspace, held in the output
        matrix.
    * better support for user-application threads: GrB_finalize is now fully
        compliant with the spec.  User applications can use POSIX or OpenMP
        threads, or no threading, and use GraphBLAS in a thread-safe manner.
        Added OpenMP and POSIX pthread demos.
    * bug fix: freeing an object (monoid, matrix, or vector) that is
        dependent on another user-defined objects (an operator or type) that
        has already been freed led to the reading of an invalid value: the size
        of the object.  This only affects the memory usage statistics for
        testing only, not production use.
    * beta bug fix: memory leak in pagerank_demo program (bug first appears in
        2.2.0BETA2, not in any non-BETA final release

Version 2.2.0 (BETA2), Nov 15, 2018

    * added additional pagerank example in Demo/
    * beta bug fix: GxB_Monoid_define: bug fix for C struct types.  bug first
        appears in Version 2.2.0 (BETA1), not in any non-BETA final release. 

Version 2.2.0 (BETA1), Nov 2, 2018

    * added GxB_*_define: to create user-defined objects at compile-time.
        All internal macros renamed to add the GB_ prefix, to help avoid
        name conflict with possible user-defined objects and macros.
    * changed default format to GxB_BY_ROW
    * performance improvements to GrB*assign* and GrB*extract
    * added PageRank demos
    * added GxB_*print: to display all GraphBLAS objects

Version 2.1.0, Oct 14, 2018

    * identical to V2.1.0 BETA2: except for a minor update to the user guide,
        and date of release

Version 2.1.0 (BETA2), Sept 17, 2018

    * user function z=f(x,y): passed to GrB_BinaryOp_new, may now be called as
        z=f(z,y), with x and z aliased.  This is permitted by the API
        specification, and greatly improves performance of user-defined
        semirings.

Version 2.1.0 (BETA1), Sept 11, 2018

    * major update: added hypersparse and CSR formats, colon notation, and
        user selection of the method used by C=A*B.  All changes to the API are
        backward compatible with Version 2.0, so the SO version does not
        increase (it is still 2.x).
    * added GxB_AxB_METHOD: for user selection of C=A*B method
    * added GxB_RANGE, GxB_STRIDE and GxB_BACKWARDS: for MATLAB-like colon
        notation: begin:end and begin:inc:end.
    * added GxB_*Option* functions: to control hypersparsity and CSR/CSC format
    * added GxB_set and GxB_set: to set/get the descriptor and other options
    * bug fix: if the accum operator z=f(x,y) was user-defined with different
        built-in types for x, y, and z, the typecasting was done incorrectly.
    * GXB_* macros renamed GxB_*: old ones kept for backward compatibility

Version 2.0.3: July 4, 2018

    * bug fix to GxB_resize
    * improvements to CMake script: version now defined only in CMakeLists.txt,
        and then cmake configures Include/GraphBLAS.h, README, and User Guide
    * bfs5 demo: asymptotically faster using sparse vector v but somewhat
        slower if entire graph is traversed

Version 2.0.2: June 25, 2018

    * added -lm to library dependency
    * minor changes to demos and user guide
    * removed unused code from Generated/* semiring functions

Version 2.0.1: Mar 15, 2018

    * bug fix in GxB_kron: computed C incorrectly when A and B had pending
        updates on input

Version 2.0.0: Mar 12, 2018

    * moved opaque object definitions from Include/GraphBLAS.h to Source/GB.h
    * modifications to meet changes in the Nov 14, 2017, API specification:
        GrB_Monoid_TYPE_new changed to GrB_Monoid_new_TYPE.
        GrB_Type_new modified: 2nd argument no longer a type, but sizeof(type).
        This change is not backward compatible with Version 1.x, so this
        required an increase in the SO version, so the version number increased
        from 1.x to 2.x.
    * to allow non-C applications to access all GraphBLAS functions:
        These were just macros, now defined as both macros and functions:
        GrB_Type_new, GrB_UnaryOp_new, GrB_BinaryOp_new, and GxB_SelectOp_new.
    * added GxB_kron, GxB_resize (GxB_Matrix_resize and GxB_Vector_resize)
    * bug fix to mask:  GrB_anymethod (C, C, ... , r_desc) where r_desc.outp
        is 'replace', and C is aliased to the Mask, was incorrect.

Version 1.1.2: Dec 28, 2017

    * build issues with cmake
    * performance improvement of dot product method, C=A'*B and v=u'*A,
        particularly when A, B and u have dense columns, or nearly dense
        columns.

Version 1.1.1: Dec 17, 2017

    * bug fix to GrB_assign and GxB_subassign: result was incorrect when
        output C was the same as the input A or Mask.
    * performance improvement in C<M>=A*B and GrB_reduce to scalar
    * split AxB built-in semirings into Source/Generated/* for
        faster compilation
    * added memory usage statistics

Version 1.1.0: Dec 1, 2017

    * add new feature: GxB_SelectOp operator and GxB_select operation
    * to clarify which features of SuiteSparse:GraphBLAS are extensions to
        the spec, the names of functions and objects not in the spec have
        changed.  They are now GxB_* (GXB_ for macros).
    * modified how the global matrix queue is accessed, for thread safety
        in case the user application is multi-threaded

Version 1.0.0: Nov 25, 2017

    * transition to CMake
    * tested on many compilers (gcc 4.9 to 7.2 on Linux, clang 8 and gcc 6.2.0
        on the Mac, xlc 13.01 on IBM Power)
    * changed printf formats in Demo/ to silence warnings from older compilers
    * complex.h in gcc-6.2.0 on the Mac doesn't #define CMPLX;
        added to usercomplex.h
    * mergesort removed, quicksort performance improved
    * performance improvement for masked matrix-matrix multiply
    * bug fix for masked matrix-matrix multiply. In 0.5.0 only the Mask
        structure was used, not the values.  The spec requires the values of
        the Mask.  This is a bug but into only affects masked matrix multiply
        when the Mask has explicit zero entries.

Version 0.5.0: Nov 13, 2017

    * resolved icc -O3 segfault: Intel compiler bug fixed icc version 18.0
    * added triangle-counting demo in C (Demo/tricount.c) and MATLAB
        (Test/tricount.m).  See also Test/test69, Test/test70. and Test/test71.
    * performance enhancements to GrB_eWiseMult, GrB_assign, GrB_subassign,
        GrB_extract, and GrB_mxm, reducing time and memory.  mxm now exploits
        the mask during computation, to save memory and often saving time.
        This is essential for good performance for triangle counting.
    * reduced Test/testall.m and Tcov/testcov.m testing time from 2 hours to
        15 minutes, maintained 100% test coverage

Version 0.4.0: Oct 24, 2017

    * SPEC: SuiteSparse:GraphBLAS 0.4.0 fully conforms to 1.1.0 of the spec
    * GrB_assign functions added; all now conform to the 1.1.0 spec 
    * renamed all prior GrB_*_assign functions to GrB_*_subassign

Version 0.3.0: Oct 14, 2017

    * changes for spec 1.1.0
    * performance improvement of GrB_mxm, GrB_mxv, transpose, GrB_reduce;
        added workspace kept internally, reused for subsequent calls to
        GraphBLAS
    * performance improvement of bfs in Demo (v held as dense vector)
    * performance improvement of GrB_assign when A is a scalar
    * performance improvement of C<M>= ... mask operation
    * GrB_Column_extract and GrB_Column_assign renamed GrB_Col_*
        to match changes in the spec
    * changed GrB_*_setElement and GrB_*_extractTuples to match the spec
    * added GrB_INSUFFICIENT_SPACE error code for GrB_*_extractTuples
    * added GrB_INVALID_HANDLE
    * GrB_assign still does not match the spec (in progress).
        It differs on how it treats entries outside C(I,J), and it differs
        in the size and interpretation of the Mask.

Version 0.2.0: Sept 5, 2017

    * No significant change to the code; but preparing for wider release
    * content of GrB_stddef.h moved into Include/GraphBLAS.h and file removed
    * User Guide updated (SPEC discussion)
    * GraphBLAS.h modified (SPEC discussions)
    * Licensed under Apache 2.0; versions 0.1.x were limited releases
    * removed wathen_mod.m (to see it do 'type private/wathen' in MATLAB)

Version 0.1.2: Aug 30, 2017

    * added (double) to fpclassify in CAST macro, to silence
        spurious errors in gcc
    * minor typos
    * icc -O3 causes a segfault when compiling GB_AxB_builtin.c, so
        Lib/GraphBLAS_config.mk now uses -O2 with icc.
    * some versions of gcc have trouble finding libgraphblas.so.0
        when compiling the Demo (if GraphBLAS is not installed with
        'make install').  Instead of requiring a 'make install'
        static linking is now used for the Demo programs.  This
        has no effect on the GraphBLAS library itself.
    * changes for GraphBLAS spec 1.0.2 (Aug 10, 2017 version):
        * GrB_Vector_reduce_Monoid renamed to GrB_Matrix_reduce_Monoid
        * GrB_Vector_reduce_BinaryOp renamed to GrB_Matrix_reduce_BinaryOp
        * GrB_Row_extract was renamed in the spec to GrB_Col_extract, but 
            this version keeps the name GrB_Column_extract since it parallels
            the name GrB_Column_assign.

Version 0.1.1: Aug 28, 2017

    * minor changes to Makefiles and GraphBLAS_config.mk
    * port to Linux with gcc 4.9.3, 5.40, and 6.3.0
    * minor code changes to silence spurious gcc warnings;
        (&Ax[i]) changed to (Ax +(i)).
    * bug fix to GB_assign1.c (apply_pending_updates variable)

Version 0.1.0: July 31, 2017

    * first version released; only to GraphBLAS API Committee

