[Qemu-devel] [Bug 1276847] Re: Build fails on latest MinGW

[Corry Lazarowitz]

I do understand  dependencies :)  I just didn't think it was necessary
to list that all out.  However, this clearly isn't a dependancy issue!
(Unless you are saying I have to use autoconf 2.5 or something instead
of the current 2.68).  I grabbed glib, devel stuff, pkgconfig, etc.  Its
all setup.  Paths to mingw in msys setup.  All the work to get things
going are done.

Now, if what you're really saying is that no one works with the 32 bit
version anymore, and so its basically unsupported, I'll grab the x64
msys....its just a hassle because internet access is slow here.  I am an
assembly optimizer, so I fully understand the benefits of x64.  I also
know very well QEMU is software only.  I'm actually looking to emulate
ppc to become a little more familier with the architecture before I have
actual hardware to play with.  I understand there is a wide range of PPC
hardware, but the instruction set is still roughly similar.Given that
its RISC I'm not sure exactly what I'm going to be able to do in
assembly to speed things up unless when I get to my target platform I
find the compiler is terrible at register management or something
equally silly.  (Its terrible on x86!  So many performance gains can be
had just by using ecx/rcx for something other than a loop counter when
there isn't a loop going on! but I digress).

Anyhow, if you do a fresh pull, grab dependencies, and get the build env
all setup, you should see the same error starting with the autoconf
issue.  I'm still yet to figure out the undefined reference to
_impure_pointer issue...most pages that talk about it are in the context
of cygwin, and I havent touched cygwin since deleting the directory and
re-extracting the archive.

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https://bugs.launchpad.net/bugs/1276847

Title:
  Build fails on latest MinGW

Status in QEMU:
  New

Bug description:
  I've run across all sorts of problems.  The first was simple, warnings
  treated as errors, and a warning of -fPIC ignored because its
  generating all code as position independant.  Next came the %hhx's
  everywhere.  MinGW is apparently following old MSVC non-C99 compliant
  systems, and hhx is not defined.  Again, warnings as errors killed the
  build.  zlib can never be found, for some reason I have to add a -I
  /include.  %llx is also not recognized on mingw, but MinGW does have
  inttypes.h, so those could easily be converted to PRIx64's with a
  regex.  asprintf is not included in MinGW, used in srcpos.c only so
  far, so I added an implementation in my build driectory which I found
  online.  lstat is not part of mingw, and ntfs's links are different
  anyhow, so I #defined lstat to stat.  fnmatch is included in
  libiberty, so I had to frab fnmatch.h from MinGW's sourceforge and
  then add the -liberty statement to the makefile.

  I get the feeling though, based on the number of warnings I'm seeing
  flash across as the compiler attempts to go through this that there
  are going to be more errors to fix. Catching the initial errors was
  quite tough because for some reason in pixman and dtc the errors
  couldn't cause compilation to stop, and running make again wouldn't
  attempt to rebuild the failures.  I had to watch it like a hawk and
  ctrl-c it when I saw an error until I finally got a build!

  For reference, my build system looks like:

  address@hidden /c/projects/qemu-1.7.0
  $ gcc -v
  Using built-in specs.
  COLLECT_GCC=C:\mingw\bin\gcc.exe
  COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.8.1/lto-wrapper.exe
  Target: mingw32
  Configured with: ../gcc-4.8.1/configure --prefix=/mingw --host=mingw32 
--build=mingw32 --without-pic --enable-shared --enable-static --with-gnu-ld 
--enable-lto --enable-libssp --disable-multilib 
--enable-languages=c,c++,fortran,objc,obj-c++,ada --disable-sjlj-exceptions 
--with-dwarf2 --disable-win32-registry --enable-libstdcxx-debug 
--enable-version-specific-runtime-libs 
--with-gmp=/usr/src/pkg/gmp-5.1.2-1-mingw32-src/bld 
--with-mpc=/usr/src/pkg/mpc-1.0.1-1-mingw32-src/bld --with-mpfr= 
--with-system-zlib --with-gnu-as --enable-decimal-float=yes --enable-libgomp 
--enable-threads --with-libiconv-prefix=/mingw32 --with-libintl-prefix=/mingw 
--disable-bootstrap LDFLAGS=-s CFLAGS=-D_USE_32BIT_TIME_T
  Thread model: win32
  gcc version 4.8.1 (GCC)

  I'm not wonderful with making patches, and most of what I've done I've
  not properly guarded against other OS's either, but if you want,
  assuming I ever get it to build, I can post the patch of all the
  changes I made...

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