More waf confusion

[Gary E. Miller]

Yo Hal!

On Wed, 29 Mar 2017 03:46:39 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:

> >>   ##    ctx.check_cc(auto_add_header_name=True,
> >>   ##                 header_name="stddef.h",
> >>   ##                 mandatory=False)  
> 
> > That might happen if you leave out the define_name argument.  
> 
> I don't see a define_name arg to leave out.
> 
> I poked around and didn't find useful documentation on either
> check_cc or define_name.  I'm probably not looking in the right place.


Not easy to find, it is defined here:

ntpsec/.waf-1.9.7-fc95bab69065dbc43ddd71d4b69d0078/waflib/Tools/c_config.py

check_cc() is a helper/wrapper function to check(), which is in the same
file.  check() collects more basic functions into a usefull  unit.

check_cc() is barely mentioned in the waf book.  Section 10.4.1 gives
a small overview of check().

Here is the relevant part:

        "define_name: sets a define of the form define_name=x when
        the test succeeds (a default value for define_name is usually
        calculated automatically)"

In your case the define name is calculated automatically.  Looking at the
code I see no way to avoid the automagic.  Only thing we could do is
undefine it after the test.

RGDS
GARY
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