Compilation fails with gcc 10.2.0 in msys2 ('multiple definition of' linking error)

[rwbc]

Hi Jay,

$ make
gcc -O3 -std=gnu11 -Wall -Wextra -Wshadow -flto -march=native -static *.c -o berserk
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccO5hkMQ.o (symbol from plugin):(.text+0x0): multiple definition of `zobristPieces'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccO5hkMQ.o (symbol from plugin):(.text+0x0): multiple definition of `zobristEpKeys'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccO5hkMQ.o (symbol from plugin):(.text+0x0): multiple definition of `zobristCastleKeys'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccO5hkMQ.o (symbol from plugin):(.text+0x0): multiple definition of `zobristSideKey'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\cc7aEOno.o (symbol from plugin):(.text+0x0): multiple definition of `baseMaterialValues'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccIVGumi.o (symbol from plugin):(.text+0x0): multiple definition of `baseMaterialValues'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccxfj1SO.o (symbol from plugin):(.text+0x0): multiple definition of `baseMaterialValues'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccPPcc0T.o (symbol from plugin):(.text+0x0): multiple definition of `baseMaterialValues'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccC6o3Ig.o (symbol from plugin):(.text+0x0): multiple definition of `zobristPieces'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccC6o3Ig.o (symbol from plugin):(.text+0x0): multiple definition of `zobristEpKeys'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccC6o3Ig.o (symbol from plugin):(.text+0x0): multiple definition of `zobristCastleKeys'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\ccC6o3Ig.o (symbol from plugin):(.text+0x0): multiple definition of `zobristSideKey'; C:\msys64\tmp\cc8m3SUt.o (symbol from plugin):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
make: *** [makefile:9: all] Error 1

Multiple definition of is a typical error for newer gcc versions. (it dislikes header redefining used in various c files)

https://stackoverflow.com/questions/17764661/multiple-definition-of-linker-error
https://mersenneforum.org/showthread.php?p=565756

I would like to compile a non-popcnt version for my hardware and already received requests for hardware
just using ssse3. (w and w/o popcnt)

Guenther

[jhonnold]

Fixed on most recent commit

[rwbc]

Thanks for the quick fix!
Compiles w/o any warning now.

Guenther