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I followed this topic: Building glew on windows with mingw but something went wrong here:

gcc -shared -Wl,-soname,libglew32.dll -Wl,--out-implib,lib/libglew32.dll.a -o lib/glew32.dll src/glew.o -L/mingw/lib -lglu32 -lopengl32 -lgdi32 -luser32 -lkernel32

I get this error:

C:\MinGW\dev_lib\glew-2.0.0>gcc -shared -Wl,-soname,libglew32.dll -Wl,--out-implib,lib/libglew32.dll.a -o lib/glew32.dll src/glew.o -L/mingw/lib -lglu32 -lopengl32 -lgdi32 -luser32 -lkernel32 src/glew.o:glew.c:(.text+0x28f80): multiple definition of `DllMainCRTStartup@12' c:/mingw/bin/../lib/gcc/mingw32/4.9.3/../../../dllcrt2.o:(.text+0x60): first defined here collect2.exe: error: ld returned 1 exit status

Thanks for help.

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spin_orbit
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1 Answers1

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You need to link with the -nostdlib option like so: 

gcc -nostdlib -shared -Wl,-soname,libglew32.dll -Wl,--out-implib,lib/libglew32.dll.a    -o lib/glew32.dll src/glew.o -L/mingw/lib -lglu32 -lopengl32 -lgdi32 -luser32 -lkernel32

Glew defines DllMainCRTStartup which is also defined in the CRT. Hence your problem.

Scott Weldon
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John Connors
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    If this is true, little doubt it is given the linker error, this is beyond incredibly nasty. -nostdlib is certainly not a valid workaround, very important to get the CRT initialized properly in a DLL. Proper advice should surely be to only ever use Glew in an EXE project. That's what it is was made for, a simple way to get started on OpenGL. – Hans Passant Aug 02 '16 at 23:01