>>>>> Ralf Stubner
>>>>> on Fri, 6 Sep 2019 11:22:15 +0200 writes:
> On Thu, Sep 5, 2019 at 6:36 PM Martin Maechler
> <maech...@stat.math.ethz.ch> wrote:
>> For me (on Fedora 30)
>>
>> $ R CMD config LDFLAGS
>> -L/usr/lib64
> This looks wrong. I would expect that /usr/lib64 is one of the
> standard directories that are searched anyway. So why put it into the
> very beginning of the search? BTW, this does not happen on Debian:
> $ R CMD config LDFLAGS
> -Wl,-z,relro
Thank you very much, Ralf!
Indeed my conclusion was wrong .. If I use Fedora's own R package,
then I also get something like the above :
$ /usr/bin/R CMD config LDFLAGS
-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld
(amazingly long ..)
It's just when I -- as in 99.9% of cases, as an R Core developer --
use my own built version of R, I get what you call "wrong".
... and it's "of course" from my ~/.R/config settings
where added a comment for this explicit LDFLAGS setting, mentioning that
otherwise it would take -L/usr/local/lib64 and that *is*
unfortunately still true:
In current R incl R-devel's <Rsource>/configure.ac (lines 157-167)
LDFLAGS *is* set to this :
--------------------------------------------------------------------
: ${LIBnn=$libnn}
## We provide these defaults so that headers and libraries in
## '/usr/local' are found (by the native tools, mostly).
if test -f "/sw/etc/fink.conf"; then
: ${CPPFLAGS="-I/sw/include -I/usr/local/include"}
: ${LDFLAGS="-L/sw/lib -L/usr/local/lib"}
else
: ${CPPFLAGS="-I/usr/local/include"}
: ${LDFLAGS="-L/usr/local/${LIBnn}"}
fi
AC_SUBST(LIBnn)
--------------------------------------------------------------------
and that setting *did* harm me in the (relatively distant, ~ 7 years?)
past, and so I had replaced it with the /usr/lib64 setting.
Hmm, maybe this should all have been on the R-devel mailing
list instead, and we should start asking if R's configure.ac
(and hence configure) should be changed ?
Martin
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