[erlang-questions] build 64bit Erlang on Solairs

Raymond Xiong <>
Thu May 1 17:37:09 CEST 2008

On 05/01/08, Mikael Pettersson wrote:
>  > 
>  > gcc -o /export/erlang/usr/src/cmd/erlang/root/otp_src_R12B-1/bin/sparc-sun-solaris2.11/beam.smp -R/usr/lib/64 -L/usr/lib/64 obj/sparc-sun-solaris2.11/opt/smp/erl_main.o ...(snipped)
>  > ld: fatal: file obj/sparc-sun-solaris2.11/opt/smp/erl_main.o:
>  > wrong ELF class: ELFCLASS64
>  > 
>  > >From what I know, the above error message means that ld was
>  > trying to generate 32bit binary file, but found the object
>  > files passed to it were 64bit files.
>  > 
>  > According to ld(1) man page on Solaris, ld can guess to generate
>  > 32bit binary file or 64bit binary file: 
> But the command above is not ld but gcc, and gcc requires -m64 to
> produce a 64-bit executable if its default is 32-bit. What happens
> is that gcc passes more options to ld than just the object file names,
> and typically one of those options selects the executable format.
> Hence gcc needs to be told if you want a non-default format.


Thanks for the information, I had thought gcc just let ld to
decide that.

If so, however, isn't it better to add CFLAGS in the follwing
line in erts/emulator/Makefile.in?


> [snip]
>  > I guess there must be many people who compile 64bit Erlang on
>  > Solaris, I googled this but only found this thread, which
>  > sugested to hard code gcc to "gcc -m64": 
>  > 
>  >     http://www.erlang.org/pipermail/erlang-questions/2006-July/021336.html
>  > 
>  > I suppose there must be a better way than that?
> env CFLAGS='-m64 -O2' LDFLAGS=-m64 ./configure ; make
> also works; I just did that to build R12B-2 on a Solaris 10 box.

Yes, I believe it would work(I haven't try it on my SPARC box yet,
because the machine is slow and it takes more than half an hour
to finish).

However, I doubt if you can enable ssl support. I expect the
following command would fail because mixing of 32-bit objects
and 64-bit objects is not permitted:

  env CFLAGS='-m64 -O2' LDFLAGS=-m64 ./configure --with-ssl=/usr/sfw \
  --enable-dynamic-ssl-lib ; make

64bit ssl lib is under /usr/sfw/lib/64, do you have any suggestion
on how to let Erlang use 64bit ssl lib under that subdir(but header
files are still under /usr/sfw/include of course)?

> The advantage of "env CC=gcc64 ./configure; make" is that
> you don't have to worry about missing some *FLAGS variable.

Yes, as a user I understand that, but I am building a package 
for OpenSolaris, so I need a more formal way.

Thanks for your help!


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