Re: [Qemu-devel] [PATCH] build: qemu-ga: add 'qemu-ga' build target for w32

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Stefan Weil (2015-11-15 02:13:36)
> Am 09.09.2015 um 11:42 schrieb Paolo Bonzini:
> >
> > On 08/09/2015 17:47, Michael Roth wrote:
> >> Currently POSIX builds rely on 'qemu-ga' target to do qga-only
> >> distributable build. On w32, as with most standalone binary targets,
> >> we rely on 'qemu-ga.exe' target.
> >>
> >> Unlike with POSIX, qemu-ga for w32 has a number of related targets
> >> such as VSS DLL and MSI package. We can do the full distributable
> >> qga-only build on w32 with:
> >>
> >>   make qemu-ga.exe
> >>
> >> or:
> >>
> >>   make msi
> >>
> >> To make that work, we tie VSS dependencies onto qemu-ga.exe.
> >> However, in reality the DLL isn't part of the binary, so we use a
> >> filter to pull them out of the LINK recipe, which attempts to link
> >> against prereqs for binary targets. Additionally, it could be argued
> >> that VSS is a separate distributable, and shouldn't be implied by
> >> qemu-ga.exe binary target.
> >>
> >> To avoid this, we can tie the VSS dependencies only to the 'msi'
> >> target, but that would make it impossible to do a qga-only build of
> >> the w32 distributable without building the 'msi' package, which was
> >> supported in the past.
> >>
> >> An alternative approach is to add a new target to build the whole
> >> distributable. w32 allows us to use the same build target we use
> >> on POSIX, 'qemu-ga', since the current binary-only target on w32
> >> is 'qemu-ga.exe'.
> >>
> >> To further simplify the build, we also make 'qemu-ga' build the MSI
> >> package if the appropriate ./configure options are set, making the
> >> full qga-only build the same on both POSIX and w32: `make qemu-ga`
> >>
> >> Cc: Paolo Bonzini <pbonzini@redhat.com>
> >> Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
> >> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> >> ---
> >>  Makefile  | 14 ++++++++------
> >>  configure |  2 +-
> >>  2 files changed, 9 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/Makefile b/Makefile
> >> index 9ce3972..7efca5e 100644
> >> --- a/Makefile
> >> +++ b/Makefile
> >> @@ -290,18 +290,15 @@ $(qapi-modules) $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
> >>  QGALIB_GEN=$(addprefix qga/qapi-generated/, qga-qapi-types.h qga-qapi-visit.h qga-qmp-commands.h)
> >>  $(qga-obj-y) qemu-ga.o: $(QGALIB_GEN)
> >>  
> >> -# we require QGA_VSS_PROVIDER files to be built alongside qemu-ga
> >> -# executable since they are shipped together, but we don't want to actually
> >> -# link against them
> >> -qemu-ga$(EXESUF): $(qga-obj-y) libqemuutil.a libqemustub.a $(QGA_VSS_PROVIDER)
> >> -    $(call LINK, $(filter-out $(QGA_VSS_PROVIDER), $^))
> >> +qemu-ga$(EXESUF): $(qga-obj-y) libqemuutil.a libqemustub.a
> >> +    $(call LINK, $^)
> >>  
> >>  ifdef QEMU_GA_MSI_ENABLED
> >>  QEMU_GA_MSI=qemu-ga-$(ARCH).msi
> >>  
> >>  msi: $(QEMU_GA_MSI)
> >>  
> >> -$(QEMU_GA_MSI): qemu-ga.exe
> >> +$(QEMU_GA_MSI): qemu-ga.exe $(QGA_VSS_PROVIDER)
> >>  
> >>  $(QEMU_GA_MSI): config-host.mak
> >>  
> >> @@ -313,6 +310,11 @@ msi:
> >>      @echo "MSI build not configured or dependency resolution failed (reconfigure with --enable-guest-agent-msi option)"
> >>  endif
> >>  
> >> +ifneq ($(EXESUF),)
> >> +.PHONY: qemu-ga
> >> +qemu-ga: qemu-ga$(EXESUF) $(QGA_VSS_PROVIDER) $(QEMU_GA_MSI)
> >> +endif
> >> +
> >>  clean:
> >>  # avoid old build problems by removing potentially incorrect old files
> >>      rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
> >> diff --git a/configure b/configure
> >> index d854936..fc34443 100755
> >> --- a/configure
> >> +++ b/configure
> >> @@ -4350,7 +4350,7 @@ fi
> >>  
> >>  if [ "$guest_agent" != "no" ]; then
> >>    if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" -o "$mingw32" = "yes" ] ; then
> >> -      tools="qemu-ga\$(EXESUF) $tools"
> >> +      tools="qemu-ga $tools"
> >>        guest_agent=yes
> >>    elif [ "$guest_agent" != yes ]; then
> >>        guest_agent=no
> >>
> > Looks good, thanks!
> >
> > Paolo
> 
> Looks good, but introduced a regression for cross builds:
> 'make install' now fails with an error:
> 
> install: cannot stat 'qemu-ga': No such file or directory
> 
> Reverting the change in configure fixes this.

Thanks for the catch. Just sent a proposed fix:

"[PATCH for-2.5] makefile: fix w32 install target for qemu-ga"

> 
> Stefan
>