https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77751
Bug ID: 77751
Summary: [7 regression] cc1plus: error: unrecognized command
line option "-Wno-implicit-fallthrough" for
insn-emit.o
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: gerald at pfeifer dot com
CC: polacek at redhat dot com
Target Milestone: ---
On i?86-unknown-freebsd9, which has GCC 4.2 as system compiler, bootstrap
started to fail as follows:
emit.TPo insn-emit.c
g++ -std=gnu++98 -fno-PIE -c -g -DIN_GCC -fno-strict-aliasing
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wwrite-strings
-Wcast-qual -Wno-format -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-fno-common -DHAVE_CONFIG_H -I. -I. -I/scratch/tmp/gerald/gcc-HEAD/gcc
-I/scratch/tmp/gerald/gcc-HEAD/gcc/.
-I/scratch/tmp/gerald/gcc-HEAD/gcc/../include -I./../intl
-I/scratch/tmp/gerald/gcc-HEAD/gcc/../libcpp/include
-I/home/gerald/9-amd64/include
-I/scratch/tmp/gerald/gcc-HEAD/gcc/../libdecnumber
-I/scratch/tmp/gerald/gcc-HEAD/gcc/../libdecnumber/dpd -I../libdecnumber
-I/scratch/tmp/gerald/gcc-HEAD/gcc/../libbacktrace -o insn-extract.o -MT
insn-extract.o -MMD -MP -MF ./.deps/insn-extract.TPo insn-extract.c
cc1plus: error: unrecognized command line option "-Wno-implicit-fallthrough"
gmake[3]: *** [Makefile:1102: insn-emit.o] Error 1
gmake[3]: *** Waiting for unfinished jobs....
rm fsf-funding.pod gcov.pod gpl.pod cpp.pod gfdl.pod gcc.pod gcov-tool.pod
gmake[3]: Leaving directory '/scratch/tmp/gerald/OBJ-0927-0731/gcc'
gmake[2]: *** [Makefile:4571: all-stage1-gcc] Error 2
gmake[2]: Leaving directory '/scratch/tmp/gerald/OBJ-0927-0731'
gmake[1]: *** [Makefile:24240: stage1-bubble] Error 2
gmake[1]: Leaving directory '/scratch/tmp/gerald/OBJ-0927-0731'
gmake: *** [Makefile:24577: bootstrap] Error 2
I believe this is caused by
2016-09-26 Marek Polacek <pola...@redhat.com>
PR c/7652
* Makefile.in (insn-attrtab.o-warn, insn-dfatab.o-warn,
insn-latencytab.o-warn, insn-output.o-warn, insn-emit.o-warn): Add
-Wno-switch-fallthrough.
