[R-pkg-devel] How to R CMD build / check using LTO

[Bill Dunlap]

I suspect your problem is that, at least with the recent gnu
compilers, the Fortran 'c_logical' maps to the C _Bool, not the C int.

-Bill

On Wed, Feb 17, 2021 at 11:38 AM Paul Schmidt-Walter
<paul.schmidt-walter using posteo.de> wrote:
>
> Dear Team,
>
> My package 'LWFBrook90R' (https://github.com/pschmidtwalter/LWFBrook90R)
> was recently released on CRAN, but there are additional LTO Issues
> (https://www.stats.ox.ac.uk/pub/bdr/LTO/LWFBrook90R.out) with the
> compiled code, that need to be fixed soon.
>
> I would like to reproduce the LTO warnings locally to see if possible
> solutions fix them, but dont know how to build and check with LTO. I am
> a newbie on Ubuntu 18.04 and hope to get help in this case.
>
> There is information provided on how to configure R to reproduce the
> test (https://www.stats.ox.ac.uk/pub/bdr/LTO/README.txt), but I simply
> don't know how to "build with configure --enable-lto" and I also can't
> find the "config.site" file on my system to enable the respective
> compiler flags (see below).
>
> Any help is appreciated!
>
> Paul
>
> ---
>
> LTO-Readme.txt:
>
> Compilation logs for CRAN packages using x86_64 Fedora 32 Linux
> (currently using GCC 10.1)built with configure --enable-lto and
> config.site:
>
> CFLAGS="-g -O2 -Wall -pedantic -mtune=native"
> FFLAGS="-g -O2 -mtune=native -Wall -pedantic"
> CXXFLAGS="-g -O2 -Wall -pedantic -mtune=native -Wno-ignored-attributes
> -Wno-deprecated-declarations -Wno-parentheses"
> AR=gcc-ar
> RANLIB=gcc-ranlib
>
> Look for [-Wlto-type-mismatch] warnings.  In some cases these involve
> Fortran CHARACTER arguments where the length is passed as a 'hidden'
> argument at the end, giving mismatches such as
>
> sblas.f:3951:14: note: type ‘long int’ should match type ‘void’
>
> To work around these, define USE_FC_LEN_T and include Rconfig.h
> (perhaps via R.h) before including BLAS.h or Lapack.h or your own
> C proptypes for Fortran functions.  Then amend the actual calls to include
> character length arguments: see the example of
> src/library/stats/src/rWishart.c
>
> in the R sources.
>
> ---
>
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