How to solve this error ":(.text+0x4d): undefined reference to `_imp___ZN10Management11OpenEm'"

How to solve this error ":(.text+0x4d): undefined reference to
`_imp___ZN10Management11OpenEm'"

I need to call some methods from a c++ program in a C program. But I just
have one shared library (.dll) to use those methods. To make it, first a
create a wrapper in C to call de methods from the dll to be use in the C
program. I have attention and I make sure that i declare the functions
with "extern "C" to avoid name mangling.
But when a compile I have a set o erros (shown in down) when a linking
wall de .o:
g++ -o bonnie++ bonnie++.o bon_io.o bon_file.o bon_time.o semaphore.o
sync.o thread.o bon_suid.o duration.o rand.o util.o utils.o super.o
pcm_file.o inode.o iname.o dir.o pcm.o -lpthread -L./ -lSmart
pcm.o:pcm.c:(.text+0x4d): undefined reference to
`_imp___ZN10Management11OpenEm'
pcm.o:pcm.c:(.text+0x64): undefined reference to
`_imp___ZN10Management12CloseEm'
pcm.o:pcm.c:(.text+0x73): undefined reference to
`_imp___ZN10Management17EnumerateEv'
pcm.o:pcm.c:(.text+0xb9): undefined reference to
`_imp___ZN18DemonstratorDevC1Ev'
pcm.o:pcm.c:(.text+0xf7): undefined reference to
`_imp___ZN18DemonstratorDevD1Ev'
pcm.o:pcm.c:(.text+0x121): undefined reference to
`_imp___ZN18DemonstratorDevice11OpenEi'
pcm.o:pcm.c:(.text+0x138): undefined reference to
`_imp___ZN18DemonstratorDev12CloseAdapterEv'
pcm.o:pcm.c:(.text+0x15f): undefined reference to
`_imp___ZN18DemonstratorDev23ConfigureClockFrequencyEi15_ClockFrequency'
pcm.o:pcm.c:(.text+0x176): undefined reference to
`_imp___ZN18DemonstratorDev21AdaptationBlockEnableEv'
pcm.o:pcm.c:(.text+0x1a1): undefined reference to
`_imp___ZN18CommandsManagementC1ER18DemonstratorDev'
pcm.o:pcm.c:(.text+0x1df): undefined reference to
`_imp___ZN18CommandsManagementD1Ev'
pcm.o:pcm.c:(.text+0x21a): undefined reference to
`_imp___ZN18CommandsManagement20DeviceInitializationEim9TimerCtrl'
pcm.o:pcm.c:(.text+0x253): undefined reference to
`_imp___ZN18CommandsManagement24EnableEmbeddedOperationsER8OWStatusim9TimerCtrl'
pcm.o:pcm.c:(.text+0x290): undefined reference to
`_imp___ZN18CommandsManagement12RegionUnlockEmmim9TimerCtrl'
pcm.o:pcm.c:(.text+0x2da): undefined reference to
`_imp___ZN18CommandsManagement17BufferedOverwriteEmmPKhiiim9TimerCtrl'
pcm.o:pcm.c:(.text+0x32c): undefined reference to
`_imp___ZN18CommandsManagement9BurstReadEmPtmih9BurstTypeim9TimerCtrl'
/usr/lib/gcc/i686-pc-cygwin/4.7.3/../../../../i686-pc-cygwin/bin/ld:
pcm.o: bad reloc address 0x20 in section `.eh_frame$_ZN10ManagementC1Ev'
collect2: error: ld returned 1 exit status
Makefile:37: recipe for target `bonnie++' failed
make: *** [bonnie++] Error 1
Someone Know what I am doing wrong?