[build2] error when trying to compile build2

[Boris Kolpackov]

Phillip Shelton via users <users at build2.org> writes:

> So I first just tried the following:
> >>C:\compilers\build2_build\build2-toolchain-0.14.0>.\build-mingw.bat c:\compilers\mingw64\bin\g++
> And got the following:
> error: C:\build2\bin\ does not exist

That's probably because you haven't unpacked build2-baseutils. For
manual bootstrap instructions please start here:

https://build2.org/build2-toolchain/doc/build2-toolchain-install.xhtml#bootstrap-windows

And then for MinGW continue with:

https://build2.org/build2-toolchain/doc/build2-toolchain-install.xhtml#bootstrap-windows-mingw


> Now I get the this error
> ..\libbutl\libbutl\process.cxx: In constructor 'butl::process::process(const butl::process_path&, const char**, butl::process::pipe, butl::process::pipe, butl::process::pipe, const char*, const char* const*)':
> ..\libbutl\libbutl\process.cxx:1386:7: error: 'unique_ptr' was not declared in this scope
> 1386 |       unique_ptr<char, void (*)(char*)> pevars (
>       |       ^~~~~~~~~~
> ..\libbutl\libbutl\process.cxx:104:1: note: 'std::unique_ptr' is defined in header '<memory>'; did you forget to '#include <memory>'?
>  103 | #include <libbutl/process-details.hxx>
>   +++ |+#include <memory>
>   104 |

Yes, there was a missing header inclusion which has been fixed for the
next release. If you would like, you can try the latest staged toolchain
which includes this fix:

https://build2.org/community.xhtml#stage

Alternatively, if you want to stick with build2 0.14.0, you can use
the (older version of) GCC compiler from the build2-mingw package
(you can still use your MinGW GCC for your own development, just the
build system will be build with an older version).