[R-pkg-devel] Checking for C++11
wright at imbs.uni-luebeck.de
Mon Nov 16 13:07:21 CET 2015
I would like to check for C++11 support in a package. The package requires gcc >= 4.7 or clang >= 3.0. Windows is handled differently in Makevars.win. I tried two approaches in Makevars so far, but both give warnings in CRAN checks.
## Check for gcc >= 4.7
ifeq ($(shell basename $(CC)),gcc)
GCC_VER := $(shell gcc -dumpversion)
GCC_MAJOR := $(shell gcc -dumpversion | cut -f1-2 -d.)
GCC_OK := $(shell echo $(GCC_MAJOR) \>= 4.7 | bc )
$(error Error: gcc >= 4.7 required, version $(GCC_VER) installed. Please update gcc.)
Works quite well but a warning in check —as-cran:
> Found the following file(s) containing GNU extensions:
> Portable Makefiles do not use GNU extensions such as +=, :=, $(shell),
> $(wildcard), ifeq ... endif. See section ‘Writing portable packages’ in
> the ‘Writing R Extensions’ manual.
Use std=c++11 flag instead of CXX_STD = CXX11, which should work on gcc >=4.7 and throw an error on earlier versions.
This time in check —as-cran:
> Non-portable flags in variable 'PKG_CPPFLAGS':
Any other ideas how to check? Or is one of the versions above OK on CRAN?
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