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Date: Fri, 6 Sep 2019 16:01:18 -0700 (PDT)
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Subject: Question for MacOS users of GNAT, gcc, and clang
From: John Perry <john.perry@usm.edu>
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Xref: reader01.eternal-september.org comp.lang.ada:57114
Date: 2019-09-06T16:01:18-07:00
List-Id: <comp.lang.ada>

Hello all

I spent about 2 hours yesterday trying to figure out why a C++ program I've=
 been working on a while wouldn't compile, link, or even run (depending on =
what precise sequence of tricks I tried). I knew something had to be horrib=
ly wrong because dyld insisted that it couldn't find the standard library's=
 "thread.join()" method, but the only thing I knew for certain was that the=
 computer had recently rebooted.

Eventually I discovered that the problem was in my PATH variable, because G=
NAT expects/requires gcc, whereas the default compiler on MacOS is clang, w=
hich I need for various reasons not worth getting into. But, for instance, =
gcc was compiling with the expectation that the program would find libstdc+=
+ at runtime, whereas MacOS links to libc++, which is why the program would=
n't build once I had it running.

This was reasonably easily fixed, and hopefully I'll remember next time, bu=
t I was wondering what other MacOS Ada & C++ developers do to avoid this: R=
un a script when you want to start Ada? Dump clang altogether and live with=
 gcc? Something else?

thanks
john perry