tidyr compile issue due to cpp11 version 0.2.0

[chriswier]

It appears that the latest cpp11 version 0.2.0 is causing downstream compilation issues for tidyr (and others). I'm building on Ubuntu 18.04.5 LTS using gcc 7.5.0 (gcc-7-7.5.0-3ubuntu1~18.04). Compilation is giving an error with: 'unmove' is not a function of 'cpp11'. Downgrading to cpp11 0.1.0 fixes the issue.

Error reports are additionally showing downstream - see tidyverse/tidyr#1024 .

My log is attached.
compile-error.txt

[KevCaz]

Also having the same problem after today's update on CRAN (ubuntu-18.04). Also, this issue has been reported today on SO: https://stackoverflow.com/questions/63348263/cant-install-tidyverse-on-latest-version-of-linux-mint.
Happy to provide further details if needed.

[bbolker]

Also note CRAN checks are failing on r-devel-linux-x86_64-fedora-clang, r-devel-linux-x86_64-fedora-gcc (possibly others in the future: these may be the first ones to have been re-checked with the new version ...)

[eduardszoecs]

Tested this against the github-version of cpp11 - unmove is fixed, but I see now error: use of deleted function ‘cpp11::enable_if_t :

** libs
g++ -std=gnu++11 -I"/usr/share/R/include" -DNDEBUG  -I'/usr/local/lib/R/site-library/cpp11/include'    -fpic  -g -O2 -fdebug-prefix-map=/build/r-base-ttHamR/r-base-4.0.2=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g  -c cpp11.cpp -o cpp11.o
cpp11.cpp: In function ‘SEXPREC* _tidyr_melt_dataframe(SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP)’:
cpp11.cpp:24:155: error: use of deleted function ‘cpp11::enable_if_t<(! std::is_same<typename std::decay<_Tp>::type, T>::value), T> cpp11::as_cpp(SEXP) [with T = const cpp11::r_vector<int>&; cpp11::enable_if_t<(! std::is_same<typename std::decay<_Tp>::type, T>::value), T> = const cpp11::r_vector<int>&; SEXP = SEXPREC*]’
      return cpp11::as_sexp(melt_dataframe(cpp11::unmove(cpp11::as_cpp<cpp11::data_frame>(data)), cpp11::unmove(cpp11::as_cpp<const cpp11::integers&>(id_ind)), cpp11::unmove(cpp11::as_cpp<const cpp11::integers&>(measure_ind)), cpp11::unmove(cpp11::as_cpp<cpp11::strings>(variable_name)), cpp11::unmove(cpp11::as_cpp<cpp11::strings>(value_name)), cpp11::unmove(cpp11::as_cpp<cpp11::sexp>(attrTemplate)), cpp11::unmove(cpp11::as_cpp<bool>(factorsAsStrings)), cpp11::unmove(cpp11::as_cpp<bool>(valueAsFactor)), cpp11::unmove(cpp11::as_cpp<bool>(variableAsFactor))));                                                                                                                                                        ^
In file included from /usr/local/lib/R/site-library/cpp11/include/cpp11.hpp:5:0,
                 from /usr/local/lib/R/site-library/cpp11/include/cpp11/declarations.hpp:8,
                  from cpp11.cpp:4:
 /usr/local/lib/R/site-library/cpp11/include/cpp11/as.hpp:180:53: note: declared here
 enable_if_t<!std::is_same<decay_t<T>, T>::value, T> as_cpp(SEXP from) = delete;
                                                     ^~~~~~
 cpp11.cpp:24:222: error: use of deleted function ‘cpp11::enable_if_t<(! std::is_same<typename std::decay<_Tp>::type, T>::value), T> cpp11::as_cpp(SEXP) [with T = const cpp11::r_vector<int>&; cpp11::enable_if_t<(! std::is_same<typename std::decay<_Tp>::type, T>::value), T> = const cpp11::r_vector<int>&; SEXP = SEXPREC*]’
      return cpp11::as_sexp(melt_dataframe(cpp11::unmove(cpp11::as_cpp<cpp11::data_frame>(data)), cpp11::unmove(cpp11::as_cpp<const cpp11::integers&>(id_ind)), cpp11::unmove(cpp11::as_cpp<const cpp11::integers&>(measure_ind)), cpp11::unmove(cpp11::as_cpp<cpp11::strings>(variable_name)), cpp11::unmove(cpp11::as_cpp<cpp11::strings>(value_name)), cpp11::unmove(cpp11::as_cpp<cpp11::sexp>(attrTemplate)), cpp11::unmove(cpp11::as_cpp<bool>(factorsAsStrings)), cpp11::unmove(cpp11::as_cpp<bool>(valueAsFactor)), cpp11::unmove(cpp11::as_cpp<bool>(variableAsFactor))));                                                                                                                                                                                                                               ^
 In file included from /usr/local/lib/R/site-library/cpp11/include/cpp11.hpp:5:0,
                 from /usr/local/lib/R/site-library/cpp11/include/cpp11/declarations.hpp:8,
                 from cpp11.cpp:4:
/usr/local/lib/R/site-library/cpp11/include/cpp11/as.hpp:180:53: note: declared here
enable_if_t<!std::is_same<decay_t<T>, T>::value, T> as_cpp(SEXP from) = delete;
                                                  ^~~~~~
/usr/lib/R/etc/Makeconf:176: recipe for target 'cpp11.o' failed
make: *** [cpp11.o] Error 1
ERROR: compilation failed for package ‘tidyr

[eduardszoecs]

Using cpp11 v0.1 is a workaround