gnat-gcc +gnuada

[ryandesign (Ryan Carsten Schmidt)]

Installing gnat-gcc +gnuada ends with

configure: error: C compiler cannot create executables

I believe it was your intention that I should download "the GnuAda compiler" from ​http://gnuada.sourceforge.net and install it prior to attempting to install the port with this variant. But I'm unclear specifically what file to download.

The port should detect if the required compiler is not installed, and exit with a more helpful error message telling the user what to do to fix it.

In addition, I assume the bootprefix change from r55182 needs to be reverted. If that's right, then it may be of benefit to add a comment to the portfile explaining why hardcoding /opt/local is necessary here (since it's usually undesirable, and someone might not realize it was intentional and replace it with ${prefix} again).

[krischik@…]

Ok, no problem - I do that - any tcl master who can tell what is the best way to detect if "${bootprefix}/bin/gnat" exists and (optionally) is user executable?

Of course there are quite a few messages allready like:

pre-configure {
    if {![variant_isset macada] &&  ![variant_isset gnatgpl] &&  ![variant_isset gnuada]  &&  ![variant_isset ada]} {
	ui_msg "######################################################"
	ui_msg "#  You need to install an Ada compiler and then	     #"
	ui_msg "#  choose an appropiate variant. For more info use:  #"
	ui_msg "#                                                    #"
	ui_msg "#  port variants gnat-gcc			     #"
	ui_msg "######################################################"
    }
}

And port variants gnat-gcc will get them:

gnat-gcc has the variants:
	powerpc: Platform variant, do not select manually
	odcctools: Use the odcctools instead of the system provided ones - does not work for x64 currently!
	macada: Uses MacAda compiler (http://www.macada.org) to bootstrap!
	gnatgpl: Uses GNAT/GPL compiler (http://libre.adacore.com) to bootstrap!
	gnuada: Uses the GnuAda (http://gnuada.sourceforge.net/) compiler to bootstrap!
	ada: Uses the MacPorts Ada (http://www.macports.org/) compiler to bootstrap!

Which reminds me: When Dr. Kanonenko was asked "Who do you write your books for" and his answer was "For people who can read".

[ryandesign (Ryan Carsten Schmidt)]

Replying to krischik@…:

Ok, no problem - I do that - any tcl master who can tell what is the best way to detect if "${bootprefix}/bin/gnat" exists and (optionally) is user executable?

You could use ​file executable:

if {[file executable ${bootprefix}/bin/gnat]} {
    ...
}

[krischik@…]

Done.