[R-pkg-devel] Weird MAKEFLAGS bug

[Kasper Daniel Hansen]

For a package, you should not mess with the optimization flag unless you
are disabling high optimization because it produces wrong code.  If people
want to use higher optimization flags, they'll compile with higher flags.

On Tue, Jan 10, 2017 at 3:39 PM, Costas Tsirogiannis <analekta at gmail.com>
wrote:

> Thanks a lot, indeed it worked using the Makevars file. I still do not
> understand why the command-line input fails but so be it.
>
> One more quick question: if I include the Makevars file in my package code
> then the requested flags are used every time somebody installs my package
> in his system. However, -O2 is a gcc-specific flag so it won't work for
> every compiler. Is there a simple way to declare another optimization flag
> in Makevars, that works for all compilers?
>
> Thanks for all the help,
>
> --Constantinos
>
> On 10 January 2017 at 12:39, Dirk Eddelbuettel <edd at debian.org> wrote:
>
> >
> > On 10 January 2017 at 11:55, Costas Tsirogiannis wrote:
> > | Greetings and thanks for previously offered solutions,
> > |
> > | I am developing a package that makes use of C++ code, and I want to
> > compile
> > | this code for testing reasons with the "R CMD SHLIB" command. Using
> > Ubuntu
> > | and gcc 5.4, and because for certain reasons I have to use the c++0x
> > | standard, I try the following command:
> > |
> > | > MAKEFLAGS='CXXFLAGS=-std=c++0x -lpthread -O2' R CMD SHLIB
> > MyMainCode.cpp
> > |
> > | For some weird reason, flag -O2 is not recognized properly and I get
> the
> > | following error message:
> > |
> > | > make: *** unknown output-sync type '2'.  Stop.
> > |
> > | If I try -O3, I get "unknown output-sync type '3' ", and so on.
> > Everything
> > | works fine if I drop this optimization flag. Could you suggest a
> > workaround
> > | for that?
> >
> > Sounds weird. Wonder if something else could go on here.
> >
> > But in general, using ~/.R/Makevars is better.  Try that.
> >
> > edd at max:~$ grep FLAGS ~/.R/Makevars | grep -v "^#"
> > CFLAGS +=              -O3 -Wall -pipe -pedantic -std=gnu99
> > CXXFLAGS +=           -O3 -Wall -pipe -Wno-unused -pedantic
> > FFLAGS += -O3 -g0 -Wall -pipe
> > FCFLAGS += -O3 -g0 -Wall -pipe
> > CXX1XFLAGS=-O3 -Wall -pipe -Wno-unused -pedantic
> > FLAGS=-Wall -O3
> > DYLIB_LDFLAGS = -Wl,-S -shared -fopenmp# $(CFLAGS) $(CPICFLAGS)
> > SHLIB_CXXLDFLAGS = -Wl,-S -shared
> > SHLIB_CXX1XLDFLAGS = -Wl,-S -shared
> > SHLIB_FCLDFLAGS = -Wl,-S -shared
> > SHLIB_LDFLAGS = -Wl,-S -shared# $(CFLAGS) $(CPICFLAGS)
> > edd at max:~$
> >
> > Dirk
> >
> > --
> > http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
> >
>
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>
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