Hello.
I have a question/suggestion concering Rcpp.
Recently I was trying to get the Gnu Binutils Autotools working inside an
R-package.
(configure.in, Makefile.am,...autoreconf,...)
In order to get the Compiler-flags in an Rcpp-project right, usually the file
"Makevars" is used, where the function Rcpp:::LdFlags() or
RcppClassic:::LdFlags() writes the linkerflags and some additional flags into
an environment variable.
In the case of the Gnu autotools however, this does not work, because the gnu
autotools expect the linkerflags (-L) and the additional flags to be specified
separately.
I tried to "fool" the autotools by putting both types of flags into one of
those constants, however the gnu autotools has a built-in condition to reject
flags in the wrong constants.
So my only solution was to sort the flags during the configure-step into the
two constants. (see below)
(I separated them depending on whether they start with an "-L" or not.)
The code is so extremly ugly, because many terms have to be double- or
tripple-escaped to be syntactically correct.
Did I overlook a function or an argument in Rcpp::: or RcppClassic::: which
outputs these two types of flags separately?
If such functions are definately not there, could they be added?
regards, Mr.M
PS.: I hope that I have not overlooked a solution or a post that deals with
this...
+-------------------+
| /src/configure.in |
+-------------------+
AC_INIT(Rmyproject.cpp)
PACKAGE=rmyproject
VERSION=0.1.0
AM_INIT_AUTOMAKE($PACKAGE, $VERSION)
AC_PROG_CXX
RCPPCXXFLAGS=`Rscript -e "Rcpp:::CxxFlags()"``Rscript -e "cat(paste(\"
-I\",RcppClassic:::RcppClassic.system.file(),\"/include\",sep=\"\"))"`
RCPPLDFLAGS=`Rscript -e "cat(paste(grep(\" -L\",paste(\"
\",strsplit(capture.output(Rcpp:::LdFlags()),\" \")@<:@@<:@1@:>@@:>@), value =
TRUE, invert=TRUE, ignore.case=TRUE),collapse=\"\"))"``Rscript -e
"cat(paste(grep(\" -L\",paste(\"
\",strsplit(capture.output(RcppClassic:::LdFlags()),\" \")@<:@@<:@1@:>@@:>@),
value = TRUE, invert=TRUE, ignore.case=TRUE),collapse=\"\"))"`
RCPPLDADD=`Rscript -e "cat(paste(grep(\" -L\",paste(\"
\",strsplit(capture.output(Rcpp:::LdFlags()),\" \")@<:@@<:@1@:>@@:>@), value =
TRUE, ignore.case=TRUE),collapse=\"\"))"``Rscript -e "cat(paste(grep(\"
-L\",paste(\" \",strsplit(capture.output(RcppClassic:::LdFlags()),\"
\")@<:@@<:@1@:>@@:>@), value = TRUE, ignore.case=TRUE),collapse=\"\"))"`
AC_SUBST(RCPPCXXFLAGS)
AC_SUBST(RCPPLDFLAGS)
AC_SUBST(RCPPLDADD)
AC_OUTPUT(Makefile myproject/src/Makefile)
+------------------+
| /src/Makefile.am |
+------------------+
EXTRA_PROGRAMS = Rmyproject.so
Rmyproject_so_SOURCES = Rmyproject.cpp coding2.cpp coding3.cpp
Rmyproject_so_CXXFLAGS = -fPIC @RCPPCXXFLAGS@ -I$(R_INCLUDE_DIR)
-I./myproject/src
Rmyproject_so_LDFLAGS = -shared @RCPPLDFLAGS@ -Wl,-rpath,$(R_PACKAGE_DIR)/libs
Rmyproject_so_LDADD = @RCPPLDADD@ $(LIBR) -L./ -lmyproject
all: Rmyproject.so
+------------+
| /configure |
+------------+
cd ./src
./configure
cd ..
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