https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119977
--- Comment #4 from Sam James <sjames at gcc dot gnu.org> --- Created attachment 61224 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61224&action=edit gimple-match-6.ii.xz (before, r16-151-g996729efbf6d0d) The patch I applied to get -fchecking=1 to see if it helped was: ``` @@ -552,8 +552,8 @@ STAGE2_CONFIGURE_FLAGS += --with-libphobos-druntime-only # stage2 and stage3 we are merely avoid doing redundant work, plus we apply # checking when building all target libraries for release builds. STAGE1_TFLAGS += -fno-checking -STAGE2_CFLAGS += -fno-checking -STAGE2_TFLAGS += -fno-checking +STAGE2_CFLAGS += -fchecking=1 +STAGE2_TFLAGS += -fchecking=1 STAGE3_CFLAGS += -fchecking=1 STAGE3_TFLAGS += -fchecking=1 ``` I dropped that for the bisect & the bits below, ofc. With the commit before (i.e. r16-151-g996729efbf6d0d) (so, stage3, given it compared fine): ``` $ /home/sam/build/gcc-before/./gcc/xg++ -B/home/sam/build/gcc-before/./gcc/ -B/home/sam/prefix/gcc-before/x86_64-pc-linux-gnu/bin/ -nostdinc++ -B/home/sam/build/gcc-before/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -B/home/sam/build/gcc-before/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -isystem /home/sam/build/gcc-before/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -isystem /home/sam/build/gcc-before/x86_64-pc-linux-gnu/libstdc++-v3/include -isystem /home/sam/git/gcc/libstdc++-v3/libsupc++ -L/home/sam/build/gcc-before/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/home/sam/build/gcc-before/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -fno-PIE -c -O2 -pipe -march=znver4 -ggdb3 -fno-checking -fcf-protection -flto=jobserver -frandom-seed=1 -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -DHAVE_CONFIG_H -fno-PIE -I. -I. -I/home/sam/git/gcc/gcc -I/home/sam/git/gcc/gcc/. -I/home/sam/git/gcc/gcc/../include -I/home/sam/git/gcc/gcc/../libcpp/include -I/home/sam/git/gcc/gcc/../libcody -I/home/sam/git/gcc/gcc/../libdecnumber -I/home/sam/git/gcc/gcc/../libdecnumber/bid -I../libdecnumber -I/home/sam/git/gcc/gcc/../libbacktrace -o gimple-match-6.o -MT gimple-match-6.o -MMD -MP -MF ./.deps/gimple-match-6.TPo gimple-match-6.cc -save-temps ``` With the commit (i.e. r16-152-g4f7b3c24112016) in stage2: ``` $ /home/sam/build/gcc-after/./stage2-gcc/xg++ -B/home/sam/build/gcc-after/./stage2-gcc/ -B/home/sam/prefix/gcc-after/x86_64-pc-linux-gnu/bin/ -nostdinc++ -B/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -B/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -isystem /home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -isystem /home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/include -isystem /home/sam/git/gcc/libstdc++-v3/libsupc++ -L/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -fno-PIE -c -O2 -pipe -march=znver4 -ggdb3 -fno-checking -fcf-protection -flto=jobserver -frandom-seed=1 -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -DHAVE_CONFIG_H -fno-PIE -I. -I. -I/home/sam/git/gcc/gcc -I/home/sam/git/gcc/gcc/. -I/home/sam/git/gcc/gcc/../include -I/home/sam/git/gcc/gcc/../libcpp/include -I/home/sam/git/gcc/gcc/../libcody -I/home/sam/git/gcc/gcc/../libdecnumber -I/home/sam/git/gcc/gcc/../libdecnumber/bid -I../libdecnumber -I/home/sam/git/gcc/gcc/../libbacktrace -o gimple-match-6.o -MT gimple-match-6.o -MMD -MP -MF ./.deps/gimple-match-6.TPo gimple-match-6.cc ``` With the commit (i.e. r16-152-g4f7b3c24112016) in stage3: ``` $ /home/sam/build/gcc-after/./stage3-gcc/xg++ -B/home/sam/build/gcc-after/./stage3-gcc/ -B/home/sam/prefix/gcc-after/x86_64-pc-linux-gnu/bin/ -nostdinc++ -B/home/sam/build/gcc-after/stage3-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -B/home/sam/build/gcc-after/stage3-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -isystem /home/sam/build/gcc-after/stage3-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -isystem /home/sam/build/gcc-after/stage3-x86_64-pc-linux-gnu/libstdc++-v3/include -isystem /home/sam/git/gcc/libstdc++-v3/libsupc++ -L/home/sam/build/gcc-after/stage3-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs -L/home/sam/build/gcc-after/stage3-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -fno-PIE -c -O2 -pipe -march=znver4 -ggdb3 -fchecking=1 -fcf-protection -flto=jobserver -frandom-seed=1 -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -DHAVE_CONFIG_H -fno-PIE -I. -I. -I/home/sam/git/gcc/gcc -I/home/sam/git/gcc/gcc/. -I/home/sam/git/gcc/gcc/../include -I/home/sam/git/gcc/gcc/../libcpp/include -I/home/sam/git/gcc/gcc/../libcody -I/home/sam/git/gcc/gcc/../libdecnumber -I/home/sam/git/gcc/gcc/../libdecnumber/bid -I../libdecnumber -I/home/sam/git/gcc/gcc/../libbacktrace -o gimple-match-6.o -MT gimple-match-6.o -MMD -MP -MF ./.deps/gimple-match-6.TPo gimple-match-6.cc ```
