Hi,
When I first built perl on a powerpc64 box (running Debian Wheezy) it built perl in 32-bit mode - ivtype of int, ivsize of 4, ptrsize of 4.
But I wanted a 64-bit perl, and I discovered I could achieve that by simply adding -Dcc="gcc -m64" to the configure args I had used.
That worked fine - perl then had ivtype of long, ivsize of 8 and ptrsize of 8.

However, did I choose the correct way of forcing 64-bit mode ? I've always been a bit concerned that the "-m64" should be in cflags, not part of the name of the compiler.
And, although that approach has worked fine for me for the last couple of years, I'm striking a problem compiling the (optional) gfortran elements in the PDL (perl) module ... and I'm beginning to think that problem might be due to the presence of "-m64" in $Config{cc}.

If I have chosen the wrong means to the end, then what's the correct/recommended means ?

Cheers,
Rob

In reply to [Linux] Controlling 32-bit mode vs 64-bit mode by syphilis

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