how to build 32-bit openjdk7 on x86_64

[Stephen Bohne]

Ben Cheng wrote:
> Hi Folks,
>
> I am trying to build 32-bit openjdk7 from source under control/make, 
> but I seem to have endless troubles picking up the right ARCH option. 
> The source code is from the b23 snapshot.
>
> I started with
>
> make ARCH_DATA_MODEL=32 ALT_BOOTDIR=/usr/lib/jvm/java-6-sun 
> ANT_HOME=<my_ant_path> FINDBUGS_HOME=<my_findbugs_path>
>
> It quickly failed with the following error:
>
> [ gcc command neglected]
> ...
> -ljvm  -L/usr/lib/jvm/java-6-sun/jre/lib/amd64 -ljava 
> -L/usr/lib/jvm/java-6-sun/jre/lib/amd64/server -ljvm -lc
> /usr/bin/ld: cannot find -ljvm
>
> because there is no amd64 under /usr/lib/jvm/java-6-sun/jre/lib but 
> only i386, and without specifying ARCH the makefile relies on "uname 
> -m" to guess the ARCH, and it chooses amd64 when seeing x86_64.
>
> So I tried to add ARCH=i386 in the command line. The build goes past 
> the previous stage, but sees a different in building corba/make/javax/xa:
>
> /bin/sh: line 5: Check_ALT_JDK_IMPORT_PATH/bin/javac: No such file or 
> directory
>
> This problem is slightly off topic, as it seems to require adding 
> ALT_JDK_IMPORT_PATH to the command-line even my intention is to do a 
> complete build. Although I still don't know why it is necessary, 
> adding ALT_JDK_IMPORT_PATH=$ALT_BOOTDIR gets me past corba, but the 
> builds stalls at hotspot:
>
>
> make[6]: *** No rule to make target 
> `openjdk/v1_7/hotspot/src/cpu/i386/vm/x86_32.ad', needed by 
> `../generated/adfiles/linux_x86_32.ad'.  Stop.
>
> Apparenly hotspot doesn't like ARCH=i386 but prefers ARCH=x86, and I 
> found a place to hack in hotspot/build/linux/Makefile, where I 
> override ARCH=$(SRCARCH) in the following context:
>
> $(TARGETS_C2):  $(SUBDIRS_C2)
>         cd $(OSNAME)_$(BUILDARCH)_compiler2/$@ && $(MAKE) $(MFLAGS) 
> ARCH=$(SRCARCH)
>
> Then, the next error shows up in exporting jvmti.html, where I need to 
> add the following rule in hotspot/build/linux/makefiles
> /defs.make if I define ARCH as i386:
>
> ifeq ($(ARCH), i386)
>   ARCH_DATA_MODEL  = 32
>   PLATFORM         = linux-i586
>   VM_PLATFORM      = linux_i486
>   HS_ARCH          = x86
> endif
>
> There is a similar patch for i586 so I suspect people tried to build 
> hotspot with ARCH=i686 and ran into similar errors.
>
> Well, this is not the end of errors, as the next one shows up in 
> jdk/make/java/jli, where it fails to locate ergo_i386.c because only 
> the following two variants are available:
>
> jdk/src/solaris/bin/ergo_i586.c
> jdk/src/solaris/bin/ergo_sparc.c
>
> In summary, my questions can be condensed into two:
>
> 1) Is control/make the right place to build everything from source. If 
> so, why is ALT_JDK_IMPORT_PATH needed in the make command line?
> 2) What is the ARCH value applicable to all modules if the goal is to 
> build 32-bit package on x86_64 platform?

I don't think (2) is supported, at least for the HotSpot workspace.  You 
have to build 32-bit on a 32-bit platform.  Yes, the build could be more 
flexible here.  Patches are welcome. :)

Don't know the answer to (1), sorry.

Steve
>
> Thanks,
> -Ben