* using log directory 'd:/Rcompile/CRANpkg/local/4.4/ManifoldOptim.Rcheck'
* using R version 4.4.3 Patched (2026-02-12 r89426 ucrt)
* using platform: x86_64-w64-mingw32
* R was compiled by
    gcc.exe (GCC) 13.3.0
    GNU Fortran (GCC) 13.3.0
* running under: Windows Server 2022 x64 (build 20348)
* using session charset: UTF-8
* checking for file 'ManifoldOptim/DESCRIPTION' ... OK
* checking extension type ... Package
* this is package 'ManifoldOptim' version '1.0.1'
* checking package namespace information ... OK
* checking package dependencies ... OK
* checking if this is a source package ... OK
* checking if there is a namespace ... OK
* checking for hidden files and directories ... OK
* checking for portable file names ... OK
* checking whether package 'ManifoldOptim' can be installed ... ERROR
Installation failed.
See 'd:/Rcompile/CRANpkg/local/4.4/ManifoldOptim.Rcheck/00install.out' for details.
* DONE
The installation logfile:
* installing *source* package 'ManifoldOptim' ...
** package 'ManifoldOptim' successfully unpacked and MD5 sums checked
** using staged installation
** libs
using C++ compiler: 'g++.exe (GCC) 13.3.0'
make[1]: Entering directory '/d/temp/2026_04_23_13_46_26_32733/RtmpotSvFr/R.INSTALL12d006ac42e6e/ManifoldOptim/src'
g++ -std=gnu++17  -I"D:/RCompile/recent/R-4.4.3p/include" -DNDEBUG -I../inst/include -IManifolds -IManifolds/Euclidean -IManifolds/Grassmann -IManifolds/L2Sphere -IManifolds/LowRank -IManifolds/Oblique -IManifolds/OrthGroup -IManifolds/PreShapeCurves -IManifolds/Sphere -IManifolds/Stiefel -IManifolds/SPDTensor -IManifolds/CpxNStQOrth -IOthers -IProblems -IProblems/ElasticCurvesRO -IProblems/EucFrechetMean -IProblems/EucQuadratic -IProblems/GrassRQ -IProblems/ObliqueTestSparsePCA -IProblems/PreShapePathStraighten -IProblems/SPDMean -IProblems/SPDTensorDL -IProblems/StieBrockett -IProblems/StieSoftICA -IProblems/StieSumBrockett -IProblems/WeightedLowrank -ISolvers -IManifoldOptim -DR_BUILD -DARMA_DONT_USE_BLAS -DARMA_DONT_USE_LAPACK -fpermissive -std=c++0x -Wno-unused-variable -Wno-unused-function -Wno-sign-compare -Wno-uninitialized -Wno-unused-but-set-variable -Wno-sequence-point -DARMA_DONT_USE_CXX11  -I'D:/RCompile/CRANpkg/lib/4.4/Rcpp/include' -I'D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include'   -I"d:/rtools44/x86_64-w64-mingw32.static.posix/include"     -pedantic -O2 -Wall  -mfpmath=sse -msse2 -mstackrealign  -c MyRcppExports.cpp -o MyRcppExports.o
In file included from D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo:27,
                 from D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/RcppArmadillo/interface/RcppArmadilloForward.h:51,
                 from D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/RcppArmadillo.h:29,
                 from MyRcppExports.cpp:2:
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/compiler_check.hpp:82:4: error: #error "*** C++14 compiler required; enable C++14 mode in your compiler, or use an earlier version of Armadillo"
   82 |   #error "*** C++14 compiler required; enable C++14 mode in your compiler, or use an earlier version of Armadillo"
      |    ^~~~~
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/compiler_check.hpp:77:65: note: '#pragma message: WARNING: option ARMA_DONT_USE_CXX11 ignored'
   77 |   #pragma message ("WARNING: option ARMA_DONT_USE_CXX11 ignored")
      |                                                                 ^
In file included from D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo:501:
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:27:1: error: 'accu' function uses 'auto' type specifier without trailing return type
   27 | auto
      | ^~~~
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:27:1: note: deduced return type only available with '-std=c++14' or '-std=gnu++14'
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:42:1: error: 'accu' function uses 'auto' type specifier without trailing return type
   42 | auto
      | ^~~~
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:42:1: note: deduced return type only available with '-std=c++14' or '-std=gnu++14'
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:57:1: error: 'accu' function uses 'auto' type specifier without trailing return type
   57 | auto
      | ^~~~
D:/RCompile/CRANpkg/lib/4.4/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:57:1: note: deduced return type only available with '-std=c++14' or '-std=gnu++14'
make[1]: *** [D:/RCompile/recent/R-4.4.3p/etc/x64/Makeconf:296: MyRcppExports.o] Error 1
make[1]: Leaving directory '/d/temp/2026_04_23_13_46_26_32733/RtmpotSvFr/R.INSTALL12d006ac42e6e/ManifoldOptim/src'
ERROR: compilation failed for package 'ManifoldOptim'
* removing 'd:/Rcompile/CRANpkg/lib/4.4/ManifoldOptim'
* restoring previous 'd:/Rcompile/CRANpkg/lib/4.4/ManifoldOptim'