[PATCH 5/5] Add with-only-headers

Peter Foley pefoley2@pefoley.com
Mon Mar 21 19:59:00 GMT 2016

On Mon, Mar 21, 2016 at 3:47 PM, Corinna Vinschen
<corinna-cygwin@cygwin.com> wrote:
> On Mar 21 13:15, Peter Foley wrote:
>> When cross-compiling a toolchan targeting cygwin, building cygwin1.dll
>> requires libstdc++v3 to be built.
> Building cygwin1.dll doesn't require libstdc++-v3.  The Cygwin DLL is
> never linked against it and never will be.  Only building the utils dir
> requires libstdc++ and that would be fixed by not builing utils as in
> your other patch, wouldn't it?

Sorry for being unclear.
Building cygwin1.dll requires the *headers* from libstdc++-v3.
To run configure-target-libstdc++-v3 (which generates necessary headers
and is a prereq for install-target-libstdc++-v3 which installs those headers),
libgcc must be able to compile. For libgcc to compile, the cygwin headers
must be available.

To summarize, configure-target-libstdc++-v3 depends on all-target-libgcc.
And all-target-libgcc requires the headers from cygwin to be installed.

Hopefully that makes more sense.



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