GCC 10 ICE compiling "lex.c"?

["John D. Baker" <jdbaker%consolidated.net@localhost>]

Even though "sh" machines are not yet officially using GCC 10, I've been
building everything with "HAVE_GCC=10" since the first machines were
switched.

Everything has built just fine up until about a week ago when my
dreamcast cross-build failed with:

[...]
#   compile  lint1/lex.o
/r0/build/current/tools/amd64/bin/shle--netbsdelf-gcc -Os -freorder-blocks   -fPIE  -g   -std=gnu99    -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wno-sign-compare  -Wsystem-headers   -Wno-traditional   -Wa,--fatal-warnings  -Wreturn-type -Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter -Wno-sign-compare -Wold-style-definition -Wsign-compare -Wformat=2  -Wno-format-zero-length  -Wno-uninitialized -Wno-maybe-uninitialized -Werror     --sysroot=/r0/build/current/DEST/dreamcast -DIS_LINT1 -I/x/current/src/usr.bin/xlint/lint1  -I. -I/x/current/src/usr.bin/xlint/lint1/../arch/sh3 -I/x/current/src/usr.bin/xlint/lint1/../common  -c    /x/current/src/usr.bin/xlint/lint1/lex.c -o lex.o
shle--netbsdelf-gcc: internal compiler error: Illegal instruction signal terminated program cc1
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://www.NetBSD.org/support/send-pr.html> for instructions.
*** Failed target: lex.o
*** Failed commands:
        ${_MKTARGET_COMPILE}
        ${COMPILE.c} ${COPTS.${.IMPSRC:T}} ${CPUFLAGS.${.IMPSRC:T}} ${CPPFLAGS.${.IMPSRC:T}} ${.IMPSRC} ${OBJECT_TARGET}
        ${CTFCONVERT_RUN}
*** [lex.o] Error code 4
nbmake[8]: stopped in /x/current/src/usr.bin/xlint/lint1
1 error
nbmake[8]: stopped in /x/current/src/usr.bin/xlint/lint1
nbmake[7]: stopped in /x/current/src/usr.bin/xlint/lint1
nbmake[6]: stopped in /x/current/src/usr.bin/xlint
nbmake[5]: stopped in /x/current/src/usr.bin
nbmake[4]: stopped in /x/current/src

nbmake[3]: stopped in /x/current/src

nbmake[2]: stopped in /x/current/src

nbmake[1]: stopped in /x/current/src

nbmake: stopped in /x/current/src

ERROR: Failed to make release
*** BUILD ABORTED ***


I saw the same error for a couple of cycles in the TNF build logs (which
have now fallen off the end of history), which would still be using GCC
9.x but it seems to have been fixed or otherwise cleared up.

Anyone else building dreamcast (or any sh machine) with HAVE_GCC=10 and
seeing this (but weren't seeing it a week or so ago)?

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