Building JDK8 b106 with sysroot and isystem

[David Holmes]

On 17/09/2013 5:31 PM, Erik Joelsson wrote:
> I agree that it's not clear how this should be done. We have support for
> compiling with a custom compiler and sysroot, though it's not yet the
> official way of building the OracleJDK. The following configure options
> are used for this:
>
> --with-tools-dir, use as a path variable to point to directories
> containing executables, like compilers.
> --with-sys-root, point to a directory root for headers and libs to
> compile and link against.
> --with-devkit, a shortcut for setting both of the above if the layout of
> the devkit follows a certain standard.

Yet our true cross-compilation builds don't use these as listed but simply:

--with-devkit
--with-x
--openjdk-target

and set compiler flags via the --with-extra-* options.

There are too many options and their meaning is very unclear.

David
-----


> When inspecting how this is treated by configure, I notice that we don't
> actually add the --sysroot option to the compile and link lines when
> setting --with-sys-root, we just use that path for looking for X11 and
> other libs we depend on. Our internal devkit was constructed to be a
> self contained toolchain, so the --sysroot parameter is already compiled
> into gcc and isn't needed, which is why it works for us.
>
> So basically, this could use some fixing.
>
> /Erik
>
> On 2013-09-16 20:14, Jungwoo Ha wrote:
>> Hi,
>>
>> I am trying to build jdk8 b106 with customized compiler and libc.
>> I'm trying to add sysroot and isystem wherever necessary.
>> The new configure seems to have --with-extra-*flags and --with-sys-root,
>> but here are problems I found so far.
>>
>> 1) It doesn't seem that --with-sys-root/--with-extra-*flags parameter is
>> actually used during the compilation
>> 2) When specifying --with-tool-dir, configure script doesn't use
>> --with-sys-root to check if the compilation and linking is done
>> correctly.
>> 3) LDFLAGS doesn't work all the time. Many makefile still contains old
>> LFLAGS.
>> 4) I can add these flags on CFLAGS and CXXFLAGS, but jdk/ doesn't
>> propagate
>> these properly.
>> 5) For example,  BUILD_GENSRC_SOR_EXE in jdk, when calling
>> SetupNativeCompilation, it doesn't pass CXXFLAGS.
>>
>> So are these new configure & make still work-in-progress, or
>> are these supposed to work?
>>
>> Thanks,
>> Jungwoo
>