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

[Stefan Weil <sw@weilnetz.de>]

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.

Stefan