[SCM] make branch, master, updated. 4.1-43-g9ae02b7

[Paul D. Smith]

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- Log -----------------------------------------------------------------
commit 9ae02b79167e66311d23979cf1433d76054b86f8
Author: Paul Smith <address@hidden>
Date:   Sun Mar 13 18:13:00 2016 -0400

    [SV 45728] Detect changes in .VARIABLES more accurately.
    
    For performance, we only recompute .VARIABLES when (a) it's expanded
    and (b) when its value will change from a previous expansion.  To
    determine (b) we were checking the number of entries in the hash
    table which used to work until we started undefining entries: now if
    you undefine and redefine the same number of entries in between
    expanding .VARIABLES, it doesn't detect any change.  Instead, keep
    an increasing change number.
    * variables.c: Add variable_changenum.
    (define_variable_in_set, merge_variable_sets): Increment
    variable_changenum if adding a new variable to the global set.
    (undefine_variable_in_set): Increment variable_changenum if
    undefining a variable from the global set.
    (lookup_special_var): Test variable_changenum not the hash table.
    * tests/scripts/variables/special: Test undefining variables.

commit 247b71e690708a529cf639e196815cbbbee077d7
Author: Paul Smith <address@hidden>
Date:   Sun Mar 13 15:59:12 2016 -0400

    * main.c(main): Disable output sync without parallel builds.

-----------------------------------------------------------------------

Summary of changes:
 main.c                          |   25 ++++++++++++++-----
 tests/scripts/variables/special |   50 ++++++++++++++++++++++----------------
 variable.c                      |   31 +++++++++++++++--------
 3 files changed, 67 insertions(+), 39 deletions(-)


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