So this is the failing command from the build: g++ -c -o /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o -MMD -MT /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o -MF /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o.d -fPIC -pipe -g -O2 -ftemplate-backtrace-limit=0 -fdebug-prefix-map=/home/wookey/debian/polymake-4.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -std=c++14 -ftemplate-depth-200 -fno-strict-aliasing -fopenmp -Wshadow -Wlogical-op -Wconversion -Wzero-as-null-pointer-constant -Wno-parentheses -Wno-error=unused-function -Wno-stringop-overflow -Wno-array-bounds -DPOLYMAKE_WITH_FLINT -DPOLYMAKE_DEBUG=0 -DNDEBUG -O2 -DPOLYMAKE_APPNAME=common -I/home/wookey/debian/polymake-4.1/include/app-wrappers -I/home/wookey/debian/polymake-4.1/include/apps -I/home/wookey/debian/polymake-4.1/include/external/permlib -I/home/wookey/debian/polymake-4.1/include/external/TOSimplex -I/home/wookey/debian/polymake-4.1/include/core-wrappers -I/home/wookey/debian/polymake-4.1/include/core /home/wookey/debian/polymake-4.1/apps/common/cpperl/generated/SparseMatrix-2.cc && : 'COMPILER_USED=10.2.0' I found that setting -g1 or -O0 makes it work. But setting -O1 does not. Nor does changing the -ftemplate-depth=number (between 50 and 500) gcc -E works (if you mkdir -p build/Opt/apps/common/cpperl first) but gcc -S ICEs So essentially building it in two steps: preprocessing to .ii, then building, works, but doing it all in one go doesn't. i.e like this: g++ -E -o /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o -MMD -MT /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o -MF /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o.d -fPIC -pipe -g -O2 -ftemplate-backtrace-limit=0 -fdebug-prefix-map=/home/wookey/debian/polymake-4.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -std=c++14 -ftemplate-depth-200 -fno-strict-aliasing -fopenmp -Wshadow -Wlogical-op -Wconversion -Wzero-as-null-pointer-constant -Wno-parentheses -Wno-error=unused-function -Wno-stringop-overflow -Wno-array-bounds -DPOLYMAKE_WITH_FLINT -DPOLYMAKE_DEBUG=0 -DNDEBUG -DPOLYMAKE_APPNAME=common -I/home/wookey/debian/polymake-4.1/include/app-wrappers -I/home/wookey/debian/polymake-4.1/include/apps -I/home/wookey/debian/polymake-4.1/include/external/permlib -I/home/wookey/debian/polymake-4.1/include/external/TOSimplex -I/home/wookey/debian/polymake-4.1/include/core-wrappers -I/home/wookey/debian/polymake-4.1/include/core /home/wookey/debian/polymake-4.1/apps/common/cpperl/generated/SparseMatrix-2.cc g++ -c -o /home/wookey/debian/polymake-4.1/build/Opt/apps/common/cpperl/SparseMatrix-2.o -fPIC -pipe -g -O2 -ftemplate-backtrace-limit=0 -fdebug-prefix-map=/home/wookey/debian/polymake-4.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -std=c++14 -ftemplate-depth-200 -fno-strict-aliasing -fopenmp -Wshadow -Wlogical-op -Wconversion -Wzero-as-null-pointer-constant -Wno-parentheses -Wno-error=unused-function -Wno-stringop-overflow -Wno-array-bounds -DPOLYMAKE_WITH_FLINT -DPOLYMAKE_DEBUG=0 -DNDEBUG -DPOLYMAKE_APPNAME=common SparseMatrix-2.ii Don't know if that helps narrow it down at all? The fact that the 2-stage build works seems rather odd to me. I tried with gcc-snapshot (20201023) and that worked correctly. so something changed between g++ (Debian 10.2.0-16) 10.2.0 and g++ (Debian 20201023-1) 11.0.0 20201023 (experimental) [master revision d08d481912b:b3da6ca6235:9e3b9ddb996f18d541a3e03611d46c3a6c0c0b5f] Is anyone in a position to bisect this so we can work out what fix should be backported? Or give me some clues on how to go about that. Any more debug suggestions? I have reported this to the ARM compiler team internally too. Wookey -- Principal hats: Linaro, Debian, Wookware, ARM http://wookware.org/
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