Пробовал указывать в /etc/nake.conf:CC=/usr/local/bin/gcc12
CXX=/usr/local/bin/c++12
CPP=/usr/local/bin/cpp12
Сборка базовой системы FreeBSD 13-STABLE обрывается по ошибке в исходнике:
% cd /usr/src/ && make cleandir buildworld
...
/usr/local/bin/gcc12 -c -O2 -pipe -frename-registers -fno-strict-aliasing -nostdinc -I. -I/usr/src/sys -I/usr/src/sys/contrib/ck/include -I/usr/src/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -MD -MF.depend.genoffset.o -MTgenoffset.o -fdebug-prefix-map=./machine=/usr/src/sys/amd64/include -fdebug-prefix-map=./x86=/usr/src/sys/x86/include -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef -Wno-pointer-sign -fformat-extensions -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error=address -Wno-error=aggressive-loop-optimizations -Wno-error=array-bounds -Wno-error=attributes -Wno-error=cast-qual -Wno-error=enum-compare -Wno-error=maybe-uninitialized -Wno-error=misleading-indentation -Wno-error=nonnull-compare -Wno-error=overflow -Wno-error=sequence-point -Wno-error=shift-overflow -Wno-error=tautological-compare -Wno-unused-but-set-variable -Wno-error=stringop-overflow -Wno-error=memset-elt-size -Wno-error=packed-not-aligned -Wno-address-of-packed-member -Wno-error=alloca-larger-than= -Wno-return-type -Wno-format-zero-length -fms-extensions -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -fms-extensions -std=iso9899:1999 -fcommon /usr/src/sys/kern/genoffset.c
gcc12: error: unrecognized command-line option '-fformat-extensions'; did you mean '-fno-ms-extensions'?
*** Error code 1
Stop.
А сборка ядра вообще невозможна:
% cd /usr/src/ && make cleandir buildkernel
...
/usr/local/bin/gcc12 -c -O2 -pipe -frename-registers -fno-strict-aliasing -nostdinc -I. -I/usr/src/sys -I/usr/src/sys/contrib/ck/include -I/usr/src/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -MD -MF.depend.genoffset.o -MTgenoffset.o -fdebug-prefix-map=./machine=/usr/src/sys/amd64/include -fdebug-prefix-map=./x86=/usr/src/sys/x86/include -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef -Wno-pointer-sign -fformat-extensions -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error=address -Wno-error=aggressive-loop-optimizations -Wno-error=array-bounds -Wno-error=attributes -Wno-error=cast-qual -Wno-error=enum-compare -Wno-error=maybe-uninitialized -Wno-error=misleading-indentation -Wno-error=nonnull-compare -Wno-error=overflow -Wno-error=sequence-point -Wno-error=shift-overflow -Wno-error=tautological-compare -Wno-unused-but-set-variable -Wno-error=stringop-overflow -Wno-error=memset-elt-size -Wno-error=packed-not-aligned -Wno-address-of-packed-member -Wno-error=alloca-larger-than= -Wno-return-type -Wno-format-zero-length -fms-extensions -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -fms-extensions -std=iso9899:1999 -fcommon /usr/src/sys/kern/genoffset.c
gcc12: error: unrecognized command-line option '-fformat-extensions'; did you mean '-fno-ms-extensions'?
*** Error code 1
Stop.
