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

[Corry Lazarowitz]

Ok, so I figured perhaps my initial attempts with cygwin were the issue,
and perhaps that made it much worse than it should have been.  So I
moved the directory and decompressed the archive again, started with
./configure, but as you said (which I didn't see in the docs) I added
--enable-debug.  So far so good, go into make, which runs configure on
pixman, and thats where I had the first error.  I'm not really sure
what's supposed to be here, but here is the error with a little
context...

checking whether to use MMX intrinsics... yes
checking whether to use SSE2 intrinsics... yes
checking whether to use VMX/Altivec intrinsics... no
checking whether to use ARM SIMD assembler... no
checking whether to use ARM NEON assembler... no
checking whether to use GNU-style inline assembler... yes
/c/projects/qemu-1.7.0/pixman/configure: line 12454: PKG_PROG_PKG_CONFIG: 
command not found
/c/projects/qemu-1.7.0/pixman/configure: line 12456: syntax error near 
unexpected token `gtk+-2.0,'
/c/projects/qemu-1.7.0/pixman/configure: line 12456: `   
PKG_CHECK_EXISTS(gtk+-2.0, enable_gtk=yes, enable_gtk=no)'
make: *** [pixman/Makefile] Error 2

Here is the offending section

PKG_PROG_PKG_CONFIG
if test $enable_gtk = auto ; then
   PKG_CHECK_EXISTS(gtk+-2.0, enable_gtk=yes, enable_gtk=no)
fi
if test $enable_gtk = yes ; then
   PKG_CHECK_MODULES(GTK, gtk+-2.0)
fi

 if test "x$enable_gtk" = xyes; then
  HAVE_GTK_TRUE=
  HAVE_GTK_FALSE='#'
else
  HAVE_GTK_TRUE='#'
  HAVE_GTK_FALSE=
fi

Just in case its relevant, here is the output from autotools before running 
configure...
configure.ac:552: the top level
configure.ac:69: installing `./config.guess'
configure.ac:69: installing `./config.sub'
configure.ac:62: installing `./install-sh'
configure.ac:62: installing `./missing'
pixman/Makefile.am: installing `./depcomp'
autoreconf-2.68: Leaving directory `.'
(cd pixman; CFLAGS="-g  -fPIC -m32  " /c/projects/qemu-1.7.0/pixman/configure  
--disable-gtk --disable-shared --enable-static)

I'm not an autotools guy, but I'm guessing PKG_PROG_PKG_CONFIG is
supposed to have resolved to something else in autotools.  I've never
had to develop something that needed to run on a wide range of platforms
without QT (qmake) or cmake, so I never ventured into autotools....

Since I can see at least for the mingw version, disable-gtk is passed,
so I just took the section out, and manually set it to no with the
following replaced section.

#PKG_PROG_PKG_CONFIG
#if test $enable_gtk = auto ; then
#   PKG_CHECK_EXISTS(gtk+-2.0, enable_gtk=yes, enable_gtk=no)
#fi
#if test $enable_gtk = yes ; then
#   PKG_CHECK_MODULES(GTK, gtk+-2.0)
#fi
#
# if test "x$enable_gtk" = xyes; then
#  HAVE_GTK_TRUE=
#  HAVE_GTK_FALSE='#'
#else
  HAVE_GTK_TRUE='#'
  HAVE_GTK_FALSE=
#fi

I suppose this may also be a source of more errors, but I think this is
pretty foolproof here.  It said --disable-gtk so, it should pretty much
be a no brainer...

It seems like perhaps I was still thinking I could use cygwin up to this
point, because I don['t have treat warnings as errors anymore.  I must
have run into problems with cygwin after this point, and decided it
might just be easier to use mingw since I remember seeing things to set
target os in one of the configure scripts, cygwin wasn't an option, but
mingw was, which made me decide to switch.  Sorry, I don't remember
where that was....

Next error comes in linking qemu-img with the following block of errors...
  LINK  qemu-img.exe
block.o: In function `bdrv_set_dirty_tracking':
c:\projects\qemu-1.7.0/block.c:4367: undefined reference to `ffs'
block/qcow2-refcount.o: In function `qcow2_pre_write_overlap_check':
c:\projects\qemu-1.7.0/block/qcow2-refcount.c:1776: undefined reference to `ffs'
block/qcow2.o: In function `qcow2_create2':
c:\projects\qemu-1.7.0/block/qcow2.c:1452: undefined reference to `ffs'
block/qed.o: In function `bdrv_qed_open':
c:\projects\qemu-1.7.0/block/qed.c:430: undefined reference to `ffs'
c:\projects\qemu-1.7.0/block/qed.c:432: undefined reference to `ffs'
C:/MinGW/msys/1.0/lib/libiberty.a(getopt.o):getopt.c:(.text+0x691): undefined 
reference to `_impure_ptr'
C:/MinGW/msys/1.0/lib/libiberty.a(getopt.o):getopt.c:(.text+0x140a): undefined 
reference to `_impure_ptr'
C:/MinGW/msys/1.0/lib/libiberty.a(getopt.o):getopt.c:(.text+0x1520): undefined 
reference to `_impure_ptr'
C:/MinGW/msys/1.0/lib/libiberty.a(getopt.o):getopt.c:(.text+0x15fc): undefined 
reference to `_impure_ptr'
C:/MinGW/msys/1.0/lib/libiberty.a(getopt.o):getopt.c:(.text+0x1632): undefined 
reference to `_impure_ptr'
C:/MinGW/msys/1.0/lib/libiberty.a(getopt.o):getopt.c:(.text+0x166b): more 
undefined references to `_impure_ptr' follow
collect2.exe: error: ld returned 1 exit status
make: *** [qemu-img.exe] Error 1

This is different than what I had before.  I don't remember anything
about ffs, so at this point, its not my cygwin attempt mucking things
up.  Anyhow, I'll keep trying to plow through this, but it does not work
smoothly on the latest MinGW/MSYS, as this was a brand new computer and
a fresh pull of MinGW/MSYS.

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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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