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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: to Simon Wright, re Mac OS X builds
Date: Thu, 06 Oct 2016 20:08:55 +0100
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Date: 2016-10-06T20:08:55+01:00
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Lucretia <laguest9000@googlemail.com> writes:

> On Thursday, 6 October 2016 18:14:28 UTC+1, Lucretia  wrote:
>
>> Aaaaand, that seems to be working. Thanks! Should be able to build an
>> iPhone compiler once this is done, Fun times!
>
> I do wonder whether it should use the system libstdc++ rather than
> build the gcc one.

Building against the gcc one causes problems when some of the symbols
aren't defined in the system one.

  build/genpreds -h ../../gcc-6.1.0/gcc/common.md ../../gcc-6.1.0/gcc/config/i386/i386.md > tmp-preds.h
  dyld: Symbol not found: __ZdlPvm
    Referenced from: /Users/simon/tmp/gcc-6.1.0-build/gcc/build/genpreds (which was built for Mac OS X 10.11)
    Expected in: /usr/lib/libstdc++.6.dylib
   in /Users/simon/tmp/gcc-6.1.0-build/gcc/build/genpreds

which I fixed by moving the just-built GCC libstdc++.6.dylib to the
place it's expected to be, in my case /opt/gcc-6.1.0/lib, and then
carrying on with the build.

I haven't reported this; perhaps -static-libstdc++ needed in
--with-boot-ldflags? This is a complicated and timeconsuming area to
investigate.