Does not build on 32 bit architectures any more

Summary:

The 32bit autobuilders of the Debian package all failed to build version 2.21.8 while these succeeded for version 2.21.7.

Description:

There is a full build log for i386 which ends with

make[1]: Entering directory '/<<PKGBUILDDIR>>/src'
g++ -std=gnu++14 -I"/usr/share/R/include" -DNDEBUG -I"../inst/include" -I"../inst/include/boost_not_in_BH" -I"." -DBOOST_DISABLE_ASSERTS -DBOOST_PHOENIX_NO_VARIADIC_EXPRESSION -DBOOST_NO_AUTO_PTR -D_REENTRANT -DSTAN_THREADS   -I'/usr/lib/R/site-library/Rcpp/include' -I'/usr/lib/R/site-library/RcppEigen/include' -I'/usr/lib/R/site-library/BH/include' -I'/usr/lib/R/site-library/StanHeaders/include' -I'/usr/lib/R/site-library/RcppParallel/include'    -fpic  -g -O2 -ffile-prefix-map=/build/r-base-DQneTm/r-base-4.2.2.20221110=. -fstack-protector-strong -Wformat -Werror=format-security -ffloat-store -Wdate-time -D_FORTIFY_SOURCE=2  -c Module.cpp -o Module.o
g++ -std=gnu++14 -I"/usr/share/R/include" -DNDEBUG -I"../inst/include" -I"../inst/include/boost_not_in_BH" -I"." -DBOOST_DISABLE_ASSERTS -DBOOST_PHOENIX_NO_VARIADIC_EXPRESSION -DBOOST_NO_AUTO_PTR -D_REENTRANT -DSTAN_THREADS   -I'/usr/lib/R/site-library/Rcpp/include' -I'/usr/lib/R/site-library/RcppEigen/include' -I'/usr/lib/R/site-library/BH/include' -I'/usr/lib/R/site-library/StanHeaders/include' -I'/usr/lib/R/site-library/RcppParallel/include'    -fpic  -g -O2 -ffile-prefix-map=/build/r-base-DQneTm/r-base-4.2.2.20221110=. -fstack-protector-strong -Wformat -Werror=format-security -ffloat-store -Wdate-time -D_FORTIFY_SOURCE=2  -c chains.cpp -o chains.o
g++ -std=gnu++14 -I"/usr/share/R/include" -DNDEBUG -I"../inst/include" -I"../inst/include/boost_not_in_BH" -I"." -DBOOST_DISABLE_ASSERTS -DBOOST_PHOENIX_NO_VARIADIC_EXPRESSION -DBOOST_NO_AUTO_PTR -D_REENTRANT -DSTAN_THREADS   -I'/usr/lib/R/site-library/Rcpp/include' -I'/usr/lib/R/site-library/RcppEigen/include' -I'/usr/lib/R/site-library/BH/include' -I'/usr/lib/R/site-library/StanHeaders/include' -I'/usr/lib/R/site-library/RcppParallel/include'    -fpic  -g -O2 -ffile-prefix-map=/build/r-base-DQneTm/r-base-4.2.2.20221110=. -fstack-protector-strong -Wformat -Werror=format-security -ffloat-store -Wdate-time -D_FORTIFY_SOURCE=2  -c grammar_inst.cpp -o grammar_inst.o

cc1plus: out of memory allocating 32 bytes after a total of 44007424 bytes
make[1]: *** [/usr/lib/R/etc/Makeconf:178: grammar_inst.o] Error 1

Reproducible Steps:

Please try to build in i386 (or armel/armhf).

RStan Version:

2.21.8

R Version:

4.2.2.20221110

Operating System:

Debian unstable

Kind regards, Andreas.

Reproduce the Debian build on i386, armel, or armhf and start by examining the compilation of grammar_inst.cpp alongside Module.cpp and chains.cpp. Compare the 2.21.8 build failure with the provided 2.21.7 context; done means the package builds successfully on a 32-bit architecture.