Which is it -pc- or -unknown-

[Steven Penny]

On Thu, 19 Oct 2017 17:00:12, cyg Simple wrote:
> So says you!  The vendor portion has been agreed to be -pc- and it isn't
> -unknown-, a patch then should be created for config.guess to match the
> agreed upon vendor.  The config.guess script supplies the default to
> configure for the build and host.  The fact that config.guess supplies
> x86_64-unknown-cygwin is used by configure is the reason my assumptions
> are correct.  If -pc- should be used then config.guess needs to change.

Let us bring some sanity to this discussion/argument. With this repository:

    git clone --depth 1 git://github.com/php/php-src
    cd php-src
    ./buildconf

Test 1:

    $ ./configure --host x86_64-pc-cygwin
    checking build system type... x86_64-unknown-cygwin
    checking host system type... x86_64-pc-cygwin
    checking for x86_64-pc-cygwin-gcc... x86_64-pc-cygwin-gcc
    checking whether the C compiler works... yes

Test 2:

    $ ./configure --host x86_64-unknown-cygwin
    checking build system type... x86_64-unknown-cygwin
    checking host system type... x86_64-unknown-cygwin
    checking for x86_64-unknown-cygwin-gcc... no
    checking for cc... cc
    checking whether the C compiler works... yes

So yes, specifying "--host x86_64-unknown-cygwin" causes it to not find
"x86_64-unknown-cygwin-gcc.exe", which makes sense because that doesnt exist.
However notice carefully in the next step that it finds
"x86_64-pc-cygwin-gcc.exe:

    $ ls -l /bin/cc
    lrwxrwxrwx 1 Steven None 7 Sep  9 17:18 /bin/cc -> gcc.exe

    $ find /bin -samefile /bin/gcc
    /bin/gcc.exe
    /bin/x86_64-pc-cygwin-gcc-6.4.0.exe
    /bin/x86_64-pc-cygwin-gcc.exe


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