[bug #47409] API support for accessing build internals

[Brian Vandenberg]

URL:
  <http://savannah.gnu.org/bugs/?47409>

                 Summary: API support for accessing build internals
                 Project: make
            Submitted by: phantal
            Submitted on: Mon 14 Mar 2016 05:33:25 PM GMT
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.1
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

Some things I'd like to see added (some of which I mentioned in another
issue):


read-only exports for select global variables (eg, current makefile name /
current line number)


A C function for checking whether a variable exists, possibly returning a
struct describing it (export/override set?, flavor, origin, pointer-to-pointer
for the variable in case they want to re-allocate it)


C functions for doing introspection:

* targets that depend on target X
* targets needed by target X
* look up target-specific variable values


Make existing macro functions non-static and exported in gnumake.h:

my_macro( /*...*/ ) {
  /* ... */
  return gmk_strip( result );
}


Add a way to make temporary variables like what $(foreach) does.





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