On Mon, 22 Apr 2019, Kacvinsky, Tom wrote:
Hi,
-----Original Message-----
From: Martin Storsjö <[email protected]>
Sent: Monday, April 22, 2019 3:36 PM
To: [email protected]
Subject: Re: [Mingw-w64-public] PKGBUILD script for toolchain, still having
GCC compile errors
<snip/>
Yes, it should have. Technically; mingw-w64-crt installs many
different lib*crt*.a; the one that links to msvcrt.dll is named
libmsvcrt-os.a and the ucrt ones are libucrtbase.a and libucrt.a. (The
latter is the one you probably want to use.) The --with-default-msvcrt
option changes which one of them is copied to be named libmsvcrt.a,
which is the one that is linked in implicitly.
So it sounds to me like this linking step is linking using the wrong
(old) mingw installation directory, not the new one (where libmsvcrt.a
is a copy of libucrt.a).
I am using the PKGBUILD scripts from
https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-gcc/PKGBUILD
I had received instructions that for the mingw-w64-crt-git PKGBUILD script,
change the
git URL to
git+https://git.code.sf.net/p/mingw-w64/mingw-w64#branch=v6.x
This conceivably would checkout out the 6.0.0 branch, so the CRT would build
with UCRT if I so specified. What I see with the official MinGW CRT tar ball -
mingw-w64-v6.0.0.tar.bz2 - is that when I configured with --with-default-msvcrt,
the line from the configure log shows
checking default msvcrt... ucrt (0x1400)
which is what I want, but the PKGBUILD script, when it runs configure, only
shows
checking default msvcrt... ucrt
That, and when compiling with the official release, I see
-D__MSVCRT_VERSION__=0x1400
This is, again, what I want. But when the CRT compiles with the PKGBUILD
script,
I see this instead
-D__MSVCRT_VERSION__=0x700
No, this is quite intentional. This is used for object files that are
explicitly intended to be usable with both msvcrt and ucrt at the same
time. (Normally an object file only works with either, except for a
carefully selected set of functionality used by crt startup files and
libmingwex.a; and those files are explicitly compiled with this option.)
This has nothing to do with your issue at all.
If you switched from -lmsvcrt to -lucrt using a spec file, and that
worked, then everything else is correct in your setup, and it's all about
invoking the right linker.
I haven't looked into how exactly that PKGBUILD file works and how it
behaves wrt compiling new runtime files with the new compiler, new headers
and libs from the new sysroot etc, so I can't comment on that
unfortunately.
// Martin
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