Building jdk-8u on AIX 7.2 problems: sizeof

[Thomas Stüfe]

Hi Adam,

I think (not sure) that defining CC=xlc may the problem. Try to remove it,
and CXX too, setting it should not be necessary if xlc is in the path.

See toolchain.m4:

    412   # Option used to tell the compiler whether to create 32- or
64-bit executables
    413   # Notice that CC contains the full compiler path at this point.
    414   case $CC in
    415     *xlc_r) COMPILER_TARGET_BITS_FLAG="-q";;
    416     *)      COMPILER_TARGET_BITS_FLAG="-m";;
    417   esac

"xlc" != "xlc_r", so we pick up COMPILER_TARGET_BITS_FLAG=-m, so we call
xlc with -m64, which it does not understand. The resulting binary has
whatever is the default, with OBJECT_MODE unset this is probably 32 bit.
Which gives the wrong sizeof().

This is just a guess, I was not able to try it for myself.

Kind Regards, Thomas




On Mon, Jun 12, 2017 at 4:57 PM, Adam Roberts <AROBERTS at uk.ibm.com> wrote:

> Hi, I'm looking to get OpenJDK 8 built on Power big-endian using AIX 7.2.
>
> I have xlc 12.1 and a small configuration script that currently does the
> following to overcome initial hurdles when configuring. I'm working off the
> latest 8 head.
>
> bash-4.3# cat AdamConfig.sh
> export CC="xlc"
> export CXX="xlc"
> export JDK_BOOT_DIR=/usr/java7_64
> export PATH=/usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/
> usr/java7_64/jre/bin:/usr/java7_64/bin:/usr/local/bin:/usr/vac/bin
>
> I source this first and then go on to ./configure.
>
> bash-4.3# cat openjdk/config.log | grep "The tested"
> configure:29034: The tested number of bits in the target (0) differs from
> the number of bits expected to be found in the target (64).
> configure:29100: error: The tested number of bits in the target (0)
> differs from the number of bits expected to be found in the target (64)
>
> As above, when configuring I can't get past the checking size of int* step.
>
> Two observations
> 1) I can compile and run a regular C application with xlc using 64 bit
> pointers with either OBJECT_MODE=64 set as an environment variable or -q64
> set as a build option
> 2) If I look in config.log I see this - notice the lack of -q64 being used
>
> configure:28993: checking size of int *
> configure:28998: /usr/vac/bin/xlc -o conftest  -m64   -m64 conftest.cpp
>  >&5
> /usr/vac/bin/xlc: 1501-216 (W) command option -64 is not recognized -
> passed to ld
> /usr/vac/bin/xlc: 1501-216 (W) command option -64 is not recognized -
> passed to ld
> ld: 0706-012 The -6 flag is not recognized.
> ld: 0706-012 The -4 flag is not recognized.
> ld: 0706-012 The -6 flag is not recognized.
> configure:28965: /usr/vac/bin/xlc -E  conftest.cpp
> configure:28965: $? = 0
> configure:28965: result: yes
> configure:28965: checking for stdio.h
> configure:28965: result: yes
> configure:28993: checking size of int *
> configure:28998: /usr/vac/bin/xlc -o conftest  -m64   -m64 conftest.cpp
>  >&5
> /usr/vac/bin/xlc: 1501-216 (W) command option -64 is not recognized -
> passed to ld
> /usr/vac/bin/xlc: 1501-216 (W) command option -64 is not recognized -
> passed to ld
> ld: 0706-012 The -6 flag is not recognized.
>
> Is there some option I'm not aware of that'll enable me to build trivially
> with xlc? Perhaps some extra work to be done to enable this?
>
> The sizeof check is defined as
>
> AC_CHECK_SIZEOF([int *], [1111])
>
> in openjdk/common/autoconf/platform.m4
>
> Full configure log available on request, it does mention
> COMPILER_NAME=gcc. But surely I can't use gcc because I see we do a
> -qversion call with xlc to determine the compiler version (and that is an
> xlc specific option AFAIK).
>
> Feels like I'm missing something here!
>
> Cheers in advance
>
>
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> IBM United Kingdom Limited - Registered in England and Wales with number
> 741598.
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