On 6/17/21 5:04 PM, José Rui Faustino de Sousa wrote:
On 17/06/21 20:51, Martin Sebor wrote:
What stage does this happens in, and if stage 1, what is the system
compiler?
>
I am not sure if this happens also in the earlier stages, I would have
to do a complete rebuild and that would take some time.
I have built gcc using an altered "opts.c" so that it compiles without
problems. After that replacing the file with the original one generates
the error. So this is happening at the later stages of compilation.
You need GCC 12 to reproduce it and as far as I can see
it needs -O0 (or -Og or -Os).
>
No problems with 11, 10 or 9, with the same flags.
That seems like a unique setup. If
this is stage 1 it doesn't use -Werror so warnings shouldn't keep
the build from succeeding. If some later stage and you're using
any unusual options (like -Og or -Os) then that would also be
unusual. Otherwise I'll need more info to understand what's going
on.
This is the full command issued by make:
/home/jrfsousa/Work/gcc/build-master/./prev-gcc/xg++
-B/home/jrfsousa/Work/gcc/build-master/./prev-gcc/
-B/opt/gcc/gcc-master/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/home/jrfsousa/Work/gcc/build-master/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/jrfsousa/Work/gcc/build-master/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/home/jrfsousa/Work/gcc/build-master/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/home/jrfsousa/Work/gcc/build-master/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
-I/home/jrfsousa/Work/gcc/gcc-master/libstdc++-v3/libsupc++
-L/home/jrfsousa/Work/gcc/build-master/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/home/jrfsousa/Work/gcc/build-master/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c -O0 -g3 -ggdb3 -gdwarf-4 -fvar-tracking-assignments
^^^
Right, with -O0 we understand why it happens. So you must have set
CXXFLAGS to -O0 (you might have said that and I forgot; if so, sorry
if I sent you on a wild goose chase). That's also the unusual part
and why others haven't run into it. Normally stage 2 and later build
with -O2 or higher.
Does that make sense?
Martin
-fno-omit-frame-pointer -fstrict-overflow -fstack-check -fchecking=1
-DIN_GCC -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-master/gcc -I../../gcc-master/gcc/.
-I../../gcc-master/gcc/../include
-I../../gcc-master/gcc/../libcpp/include
-I../../gcc-master/gcc/../libcody
-I/home/jrfsousa/Work/gcc/build-master/./gmp
-I/home/jrfsousa/Work/gcc/gcc-master/gmp
-I/home/jrfsousa/Work/gcc/build-master/./mpfr/src
-I/home/jrfsousa/Work/gcc/gcc-master/mpfr/src
-I/home/jrfsousa/Work/gcc/gcc-master/mpc/src
-I../../gcc-master/gcc/../libdecnumber
-I../../gcc-master/gcc/../libdecnumber/bid -I../libdecnumber
-I../../gcc-master/gcc/../libbacktrace
-I/home/jrfsousa/Work/gcc/build-master/./isl/include
-I/home/jrfsousa/Work/gcc/gcc-master/isl/include -o opts.o -MT opts.o
-MMD -MP -MF ./.deps/opts.TPo ../../gcc-master/gcc/opts.c
Applying the command by hand still fails, with or without the flags I
used (-O0 -g3 -ggdb3 -gdwarf-4 -fvar-tracking-assignments
-fno-omit-frame-pointer -fstrict-overflow -fstack-check), after removing
"-Wall" the compilation succeeds without problems.
Thank you very much.
Best regards,
José Rui
