[Bug middle-end/77740] New: [7 regression] internal compiler error: in format_floating, at gimple-ssa-sprintf.c:1165

["gerald at pfeifer dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77740

            Bug ID: 77740
           Summary: [7 regression] internal compiler error: in
                    format_floating, at gimple-ssa-sprintf.c:1165
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerald at pfeifer dot com
  Target Milestone: ---

Created attachment 39685
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39685&action=edit
Preprocessed input file (generated with -save-temps)

About four, five days ago, I started to see Wine fail to build with my daily
builds of GCC on i?86-unknown-freebsd10:

gmake[1]: Entering directory '/home/gerald/wine/dlls/msvcr100'
/home/gerald/gcc-ref10-i386/bin/gcc -c -o math.o ../msvcrt/math.c -I.
-I../msvcrt -I../../include -D__WINESRC__ -D_MT \
  -D_MSVCR_VER=100 -D_REENTRANT -fPIC -Wall -pipe -fno-strict-aliasing
-Wdeclaration-after-statement \
  -Wduplicated-cond -Wempty-body -Wignored-qualifiers -Wshift-overflow=2
-Wstrict-prototypes \
  -Wtype-limits -Wunused-but-set-parameter -Wno-unused-const-variable -Wvla
-Wwrite-strings \
  -Wpointer-arith -Wlogical-op -gdwarf-2 -gstrict-dwarf -fno-omit-frame-pointer
\
  -I/home/gerald/10-i386/include -g -O2
../msvcrt/math.c: In function ‘MSVCRT__ecvt’:
../msvcrt/math.c:1370:14: internal compiler error: in format_floating, at
gimple-ssa-sprintf.c:1165
 char * CDECL MSVCRT__ecvt( double number, int ndigits, int *decpt, int *sign )
              ^~~~~~~~~~~~