From winstonchang1 at gmail.com  Wed Apr  5 22:46:29 2017
From: winstonchang1 at gmail.com (Winston Chang)
Date: Wed, 5 Apr 2017 15:46:29 -0500
Subject: [Rd] Very hard to reproduce bug (?) in R-devel
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On Wed, Apr 5, 2017 at 2:24 PM, Robert McGehee <rmcgehee at walleyetrading.net>
wrote:

> Winston,
> I had a similar experience to you tracking down an insanely difficult bug
> in my R code that "disappeared" whenever slight changes were made to the
> script (e.g. like adding cat() statements). In my case, it coincided with
> my over-eager compilation of R and its library stack, as I was also
> experimenting with a cutting edge version of the gcc compiler as well as
> what I thought were innocuous performance enhancing CFLAGS like -O3/-Ofast
> -march=native. After downgrading gcc and recompiling everything (R and
> BLAS) without the extra flags, the problem went away. Not saying this is
> your problem, just sharing my similar experience.
>
>
Thanks Robert. I'm glad that I'm not the only one who's encountered an
issue like this. "Insanely difficult" is an apt description. :)

I've been using the rocker/r-devel for testing. It compiles R with the
following CFLAGS:
  -g -O2 -fdebug-prefix-map=/build/r-base-3.3.3=. -fstack-protector-strong
-Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g
It looks like it gets those settings from running R CMD config CFLAGS with
the already-installed version of R (3.3.3) which comes from a .deb package.
  https://github.com/rocker-org/rocker/blob/master/r-devel/Dockerfile#L76


I've also compiled R (again, in Docker) and tested with that, and gotten
the same results. It basically uses just `./configure
--without-recommended-packages`
and then `make`.

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[Rd] Very hard to reproduce bug (?) in R-devel
Winston Chang