trying to build a PortMidi example in Mingw

Question

Im trying to build a PortMidi example in Mingw but it depends on two libraries portmidi and winmm, I recompiled portmidi to get a portimidi.a but Im getting errors of missing code.

Is posible to link winmm to mingw, and I have to use ".a" or ".lib" libraries?

Im using this command to compile the source:

g++ -o prg latency.c -IHeaders -LLib -lportmidi -lwinmm 

Thanks for your help.

Answer 1

You don't need winmm.a to build latency.c

you need
libpmjni.dll.a , libportmidi.dll.a or
libportmidi_s.a

To build portmidi wit CMake takes 5 minutes.

• portmidi source : c:/src/portmidi217/
• portmidi build : c:/minGW/portmidi

Then you can compile it with the following command.

gcc.exe  -c -g -I/c/src/portmidi217/pm_common -I/c/src/portmidi217/porttime -MMD -MP -MF build/Debug/latency.o.d -o build/Debug/latency.o latency.c
mkdir -p dist/Debug
gcc.exe  -o dist/Debug/latency build/Debug/latency.o -L/c/minGW/portmidi -lpmjni.dll -lportmidi.dll 

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Building portmidi with CMake

• Download or use Cmake
• in c:\cmake\bin folder double click cmake-gui.exe

unzip portmidi to the folder c:\minGW\src\portmidi217 you can see in the next image
(replace all T:\ with C:\ of course)

press configure

settings as described --> click next

settings as described --> click ok

there a errors so click configure again

next looks better click configure again

settings as described Release or Debug
maybe it worked without c:\msys\1.0\bin\sh.exe
click configure again

looks good --> click Generate

cd to your just builded c:\minGW\portmidi

open windows command type make

it takes a short time to build

there they are : .a and .dll

• copy all .a to c:\minGW\lib
• copy all .dll to c:\minGW\bin
• copy from C:\minGW\src\portmidi217\pm_common and C:\minGW\src\portmidi217\porttime
  all .h to the folder where your latency.c is.

Then you can latency.c compile as described above, you just need to adjust the paths.