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Rebuilds will happen only if:

...
        4. a dependent header file has changed
        5. the command to link the executable or build the library arc
+hive has changed
        6. the executable or library has changed or is missing

FEATURES AND ADVANTAGES
     1. Everything is done with SHA1 signatures.  No dates are used an
+ywhere.
...
     6. Optionally, the signatures of dynamic libraries may be tracked
+.  If a library signature changes the bld may warn or stop the rebuil
+d.  If dynamic libraries are added or deleted from the bld this can i
+gnore/warn/fatal.
     7. A change in the target signature will result in a rebuild.
     8. Complex multi-target projects are built with a standard direct
+ory setup and a standard set of scripts - Directories:

/tmp>mkdir empty
/tmp>cd empty
...
/tmp/empty>ls
demo  demo.c
/tmp/empty>

     1. bld assumes that a source will build a derived file e.g. .o fi
+les in the same directory and have the same root name as the source.

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     3. Some projects violate either or both of these target naming or
+ object file naming/location requirements, but reconstructing these p
+rojects with bld should be relatively easy e.g. systemd.

     4. bld executes cmd fields({}) in the bld directory and then move
+s all created files to the source directory.