Mingw-w64 and flto

[Greg Williamson]

I only get errors when using -flto with mingw-w64. With no -flto flag
theres no errors and with gnu g++ theres no error. Is this just a bug
in mingw? Is there a work around?


[greg@greg-desktop polyedit]$ i686-w64-mingw32-g++ -v
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-
g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-w64-mingw32/4.9.1/lto-wrapper
Target: i686-w64-mingw32
Configured with: /build/mingw-w64-gcc/src/gcc-4.9.1/configure
--prefix=/usr --libexecdir=/usr/lib --target=i686-w64-mingw32
--enable-languages=c,lto,c++,objc,obj-c++,fortran,ada --enable-shared
--enable-static --enable-threads=posix --enable-fully-dynamic-string
--enable-libstdcxx-time=yes --with-system-zlib
--enable-cloog-backend=isl --disable-cloog-version-check
--disable-isl-version-check --enable-lto --disable-dw2-exceptions
--enable-libgomp --disable-multilib --enable-checking=release
Thread model: posix
gcc version 4.9.1 (GCC)


i686-w64-mingw32-g++ -DSFML_STATIC -Wall -s -O3 -flto -std=c++11 -I.
-I/home/greg/SFML/include
-I/usr/i686-w64-mingw32/lib/wx/include/i686-w64-mingw32-msw-unicode-static-3.0
-I/usr/i686-w64-mingw32/include/wx-3.0 -D_FILE_OFFSET_BITS=64
-D__WXMSW__  -MMD -MP -c -o .build/./sources/Drawables.o
sources/Drawables.cpp
i686-w64-mingw32-g++ -DSFML_STATIC -Wall -s -O3 -flto -std=c++11 -I.
-I/home/greg/SFML/include
-I/usr/i686-w64-mingw32/lib/wx/include/i686-w64-mingw32-msw-unicode-static-3.0
-I/usr/i686-w64-mingw32/include/wx-3.0 -D_FILE_OFFSET_BITS=64
-D__WXMSW__  -MMD -MP -c -o .build/./sources/MainWindow.o
sources/MainWindow.cpp
i686-w64-mingw32-g++ -DSFML_STATIC -Wall -s -O3 -flto -std=c++11 -I.
-I/home/greg/SFML/include
-I/usr/i686-w64-mingw32/lib/wx/include/i686-w64-mingw32-msw-unicode-static-3.0
-I/usr/i686-w64-mingw32/include/wx-3.0 -D_FILE_OFFSET_BITS=64
-D__WXMSW__  -MMD -MP -c -o .build/./sources/ToolBar.o
sources/ToolBar.cpp
i686-w64-mingw32-g++ -DSFML_STATIC -Wall -s -O3 -flto -std=c++11 -I.
-I/home/greg/SFML/include
-I/usr/i686-w64-mingw32/lib/wx/include/i686-w64-mingw32-msw-unicode-static-3.0
-I/usr/i686-w64-mingw32/include/wx-3.0 -D_FILE_OFFSET_BITS=64
-D__WXMSW__  -MMD -MP -c -o .build/./sources/Canvas.o
sources/Canvas.cpp
i686-w64-mingw32-g++ -o polyedit.exe .build/./sources/Canvas.o
.build/./sources/ToolBar.o .build/./sources/MainWindow.o
.build/./sources/Drawables.o -flto -s -O3 -static -static-libgcc
-static-libstdc++ -L/home/greg/SFML/lib/ -lsfml-graphics-s
-lsfml-window-s -lsfml-system-s   -Wl,--subsystem,windows -mwindows
/usr/i686-w64-mingw32/lib/libwx_mswu_xrc-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_mswu_webview-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_mswu_qa-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_baseu_net-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_mswu_html-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_mswu_adv-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_mswu_core-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_baseu_xml-3.0-i686-w64-mingw32.a
/usr/i686-w64-mingw32/lib/libwx_baseu-3.0-i686-w64-mingw32.a
/home/greg/libpng-1.2.52/libpng12_static.a
/usr/i686-w64-mingw32/lib/libjpeg.a -ltiff -lexpat
-lwxregexu-3.0-i686-w64-mingw32 /usr/i686-w64-mingw32/lib/libz.a
-lrpcrt4 -loleaut32 -lole32 -luuid -lwinspool -lwinmm -lshell32
-lcomctl32 -lcomdlg32 -ladvapi32 -lwsock32 -lgdi32  -lglew -lopengl32
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD1Ev[__ZThn360_N11ImageCanvasD1Ev]+0x0):
multiple definition of `ImageCanvas::~ImageCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD1Ev[__ZThn400_N11ImageCanvasD1Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD1Ev[__ZThn360_N11ImageCanvasD1Ev]+0x0):
multiple definition of `non-virtual thunk to
ImageCanvas::~ImageCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD1Ev[__ZThn400_N11ImageCanvasD1Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD1Ev[__ZThn360_N11ImageCanvasD1Ev]+0x0):
multiple definition of `non-virtual thunk to
ImageCanvas::~ImageCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD1Ev[__ZThn400_N11ImageCanvasD1Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD0Ev[__ZThn360_N11ImageCanvasD0Ev]+0x0):
multiple definition of `ImageCanvas::~ImageCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD0Ev[__ZThn400_N11ImageCanvasD0Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD0Ev[__ZThn360_N11ImageCanvasD0Ev]+0x0):
multiple definition of `non-virtual thunk to
ImageCanvas::~ImageCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD0Ev[__ZThn400_N11ImageCanvasD0Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD0Ev[__ZThn360_N11ImageCanvasD0Ev]+0x0):
multiple definition of `non-virtual thunk to
ImageCanvas::~ImageCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN11ImageCanvasD0Ev[__ZThn400_N11ImageCanvasD0Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD1Ev[__ZThn360_N10GridCanvasD1Ev]+0x0):
multiple definition of `GridCanvas::~GridCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD1Ev[__ZThn400_N10GridCanvasD1Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD1Ev[__ZThn360_N10GridCanvasD1Ev]+0x0):
multiple definition of `non-virtual thunk to
GridCanvas::~GridCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD1Ev[__ZThn400_N10GridCanvasD1Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD1Ev[__ZThn360_N10GridCanvasD1Ev]+0x0):
multiple definition of `non-virtual thunk to
GridCanvas::~GridCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD1Ev[__ZThn400_N10GridCanvasD1Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD0Ev[__ZThn360_N10GridCanvasD0Ev]+0x0):
multiple definition of `GridCanvas::~GridCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD0Ev[__ZThn400_N10GridCanvasD0Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD0Ev[__ZThn360_N10GridCanvasD0Ev]+0x0):
multiple definition of `non-virtual thunk to
GridCanvas::~GridCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD0Ev[__ZThn400_N10GridCanvasD0Ev]+0x0):
first defined here
.build/./sources/MainWindow.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD0Ev[__ZThn360_N10GridCanvasD0Ev]+0x0):
multiple definition of `non-virtual thunk to
GridCanvas::~GridCanvas()'
.build/./sources/Canvas.o (symbol from
plugin):(.gnu.linkonce.t._ZN10GridCanvasD0Ev[__ZThn400_N10GridCanvasD0Ev]+0x0):
first defined here
Warning: resolving _glewInit@0 by linking to _glewInit
Use --enable-stdcall-fixup to disable these warnings
Use --disable-stdcall-fixup to disable these fixups
Warning: resolving _glewGetErrorString@4 by linking to _glewGetErrorString
collect2: error: ld returned 1 exit status
Makefile-win:44: recipe for target 'polyedit.exe' failed
make: *** [polyedit.exe] Error 1