Cross compiling on Linux

[Duncan_Soutar]

Hi
I wonder if somebody can help. I have ifort 10.1.008 on a 64-bit linux box. I am successfully building a project using a makefile, in native 64-bit. I wish to build a 32-bit version as well but cannot find any compiler option to do this.

The Release notes (/opt/intel/fce/10.1.008/doc/Release_Notes.htm), in the section "Native and Cross-Platform Development", state the following:
"
Intel 64 Architecture Host
Supported targets: IA-32 and Intel 64
"
There are numerous options relating to architecture, similar to those I am used to under Solaris, for example, but nothing seems to switch between ia32 and em64t or whatever names one might feel like using. (x86_64 might be useful so that one could use `arch`).

Ideally I would like to use the one makefile to build all the chosen targets.

Many thanks

Simon.

[TimP]

If you install the 32-bit compiler, you can compile on x86_64 to run in 32-bit mode on either x86_64 or 32-bit linux. There isn't a command line switch to invoke 32-bit mode, similar to gcc -m32. You must reset the environment variables by the ifortvars script to switch between 32- and 64-bit compilers. You could build that into your Makefile if you so choose.

[Duncan_Soutar]

Quoting - tim18

If you install the 32-bit compiler, you can compile on x86_64 to run in 32-bit mode on either x86_64 or 32-bit linux. There isn't a command line switch to invoke 32-bit mode, similar to gcc -m32. You must reset the environment variables by the ifortvars script to switch between 32- and 64-bit compilers. You could build that into your Makefile if you so choose.

Thanks tim18 for confirming this.

I see that it will take some messing about to have it work in my makefile and also leave a useable environment outside of make. At least I can avoid more wasted time reading the docs. It would help if the Release Notes were a bit clearer on this issue of cross-compiling.

At least I now see the way to provide release and debug builds in both 32-bit and 64-bit, like in windows.

Cheers
Simon.