[R-pkg-devel] R_MAKEVARS_USER fail to pass down to sub-makes?

[Jeff Newmiller]

I don't know anything about the function of that environment variable, but 

a) system() invokes a child process so environment variable changes made using it will only affect the child process created by that system call.

b) The syntax you have used is shell-specific, so does not look portable.

On June 1, 2020 4:58:19 AM PDT, Jan Gorecki <j.gorecki using wit.edu.pl> wrote:
>Hi package devel support,
>
>I am trying to use R_MAKEVARS_USER to customize build, rather than
>.R/Makevars. It is properly displayed from config CFLAGS but during
>package install it doesn't seem to work.
>
>In R-admin in "6.3.3 Customizing package compilation" there is:
>
>> Note that these mechanisms do not work with packages which fail to
>pass settings down to sub-makes, perhaps reading etc/Makeconf in
>makefiles in subdirectories.
>
>It seems that it applies to me. How should I debug that? to make this
>env var respected? Note that my pkg has src/Makevars to handle openmp
>switch nicely
>Thank you
>
>system("R_MAKEVARS_USER=library/gcc/O3/Makevars R CMD config CFLAGS")
>-O3
>
>system("R_MAKEVARS_USER=library/gcc/O3/Makevars R CMD INSTALL
>--library=library/gcc/O3 mypkg_1.0.0.tar.gz")
>* installing *source* package 'mypkg' ...
>** using staged installation
>** libs
>gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG    -fopenmp -fpic  -g
>-O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=.
>-fstack-protector-strong -Wformat -Werror=format-security -Wdate-time
>-D_FORTIFY_SOURCE=2 -g  -c assign.c -o assign.o
>
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-- 
Sent from my phone. Please excuse my brevity.