Compiling gVim 8.1 (latest) on Windows 7 64-bit with MinGW gcc 7.30 64-bit I
receive the following compiler warning in file undo.c:
gcc -c -Iproto -DWIN32 -DWINVER=0x0600 -D_WIN32_WINNT=0x0600 -DHAVE_PATHDEF
-DFEAT_BIG -DHAVE_STDINT_H -DMS_WIN64 -DHAVE_GETTEXT -DHAVE_LOCALE_H
-DDYNAMIC_GETTEXT -DFEAT_CSCOPE -DFEAT_MBYTE
-DFEAT_MBYTE_IME -DDYNAMIC_IME -DDYNAMIC_ICONV -pipe -march=x86-64 -Wall
-DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 -DDYNAMIC_PYTHON3_DLL=\"python36.dll\" -O3
-fomit-frame-pointer -freg-struct-return
-s undo.c -o objx86-64/undo.o
undo.c: In function 'u_save_cursor':
undo.c:270:6: warning: assuming signed overflow does not occur when assuming
that (X - c) > X is always false [-Wstrict-overflow]
if (top > curbuf->b_ml.ml_line_count
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|| top >= bot
^~~~~~~~~~~~~
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