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

[Corry Lazarowitz]

Well, despite those very real error messages I had, its gone now with a
full msys reinstall.  Same dependencies for 32 bit.  I just decided to
try the 64 bit since to me it seemed like you were saying that would be
more likely to work.  As part of installing the 64 bit, I decided to
incur more pain and sort mingw by 32 bit and 64 bit directories.  Since
I didn't know what dependencies on directory structure may exist
internally, I just blew it all away and reinstalled both 64 and 32 bit.
64 bit QEMU built, so I went back and tried 32, and no problem with
configure.  In x64 I had to enable the built in ffs again, and I suspect
I'll have to do that in 32 bit as well if I want to build it, but since
configure worked this time, I am guessing something went wrong with the
msys/mingw install.  I don't normally use mingw, so this was the first
project I had tried to compile with it.  I did't keep any of the old
mingw so I can't test that theory, but its the best I've got!

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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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