On 9/7/20 7:07 PM, b...@denney.ws wrote:
Hello,
My question is:
Can I use the 64-bit gcc to build a 32-bit package with the -m32 command
line option with Rtools? And, can that work for CRAN? Or more generally,
is there a work-around for needing lots of RAM during compilation with the
32-bit compiler?
The background is:
I'm trying to compile a the development version of RxODE
(https://github.com/nlmixrdevelopment/RxODE/issues/278), but I'm hitting
32-bit memory limits (using >3GB and possibly >4GB RAM during compilation)
using the 32-bit version of gcc. Specifically,
I think this is too much memory to be used for compilation. I think it
would be best to simplify the code, possibly split it, or just reduce
the optimization level, as I read you have done already anyway. Maybe it
doesn't have to be -O0, maybe you can enable some. In the past I've seen
similar cases when inlining too aggressively in large files, maybe you
could just reduce that a bit. It may very well be that reducing the
optimization level just a little bit will provide about the same
performance, but require far less memory at compile time (in the past
there have been cases when -O3 did not produce faster code than -O2 on a
set of standard benchmarks, of course that may be different in today's
compilers).
Spending much more time for optimizing of the 32-bit builds may not be
worth the effort (and neither on the R/CRAN side).
Best
Tomas
"C:/rtools40/mingw32/bin/"gcc [etc., see the link above for the full command
line]
yields the error
cc1.exe: out of memory allocating 65536 bytes
There is no problem building with mingw64, and I played around to confirm
that by using:
Sys.setenv(BINPREF="c:/rtools40/mingw64/bin/")
And compilation completed successfully (though installation failed as
expected because the compiled .dll couldn't load on 32-bit R).
Thanks,
Bill
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