Hi Paul, using a recent GCC when building GCC results in a possibly uninitialized access:
$ .../gcc/configure --target=pdp11-aout --enable-werror-always --enable-languages=all --disable-gcov --disable-shared --disable-threads --without-headers [...] $ make all-gcc [...] [all 2021-09-04 17:21:14] /usr/lib/gcc-snapshot/bin/g++ -fno-PIE -c -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../libbacktrace -o xcoffout.o -MT xcoffout.o -MMD -MP -MF ./.deps/xcoffout.TPo ../../gcc/gcc/xcoffout.c [all 2021-09-04 17:21:16] /usr/lib/gcc-snapshot/bin/g++ -fno-PIE -c -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../libbacktrace -o pdp11.o -MT pdp11.o -MMD -MP -MF ./.deps/pdp11.TPo ../../gcc/gcc/config/pdp11/pdp11.c [all 2021-09-04 17:21:19] ../../gcc/gcc/config/pdp11/pdp11.c: In function 'bool pdp11_rtx_costs(rtx, machine_mode, int, int, int*, bool)': [all 2021-09-04 17:21:19] ../../gcc/gcc/config/pdp11/pdp11.c:1113:39: error: 'src' may be used uninitialized in this function [-Werror=maybe-uninitialized] [all 2021-09-04 17:21:19] 1113 | *total += pdp11_addr_cost (src, mode, ADDR_SPACE_GENERIC, speed); [all 2021-09-04 17:21:19] | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [all 2021-09-04 17:21:20] cc1plus: all warnings being treated as errors [all 2021-09-04 17:21:20] make[1]: *** [Makefile:2421: pdp11.o] Error 1 [all 2021-09-04 17:21:20] make[1]: Leaving directory '/var/lib/laminar/run/gcc-pdp11-aout/11/toolchain-build/gcc' [all 2021-09-04 17:21:20] make: *** [Makefile:4422: all-gcc] Error 2 The warning seems legit, though hardly reachable in reality. Maybe fix it for sure, though? Thanks, Jan-Benedict --
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