I am moving our fe code to c++ midas with cmake. I did encounter your a) problems.

How do I solve mismatched declarations in the mfe (or other places in the midas code)? It is having issues with the midas defined BOOL/... types. This 
is what I get for a minimal scfe:

[ 12%] Building CXX object CMakeFiles/sc_fe_mini.dir/sc_fe_mini.cpp.o
[ 25%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/class/hv.cxx.o
[ 37%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/class/multi.cxx.o
[ 50%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/device/nulldev.cxx.o
[ 62%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/bus/null.cxx.o
[ 75%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/drivers/device/mscbdev.cxx.o
[ 87%] Building CXX object CMakeFiles/sc_fe_mini.dir/home/frederik/packages/midas/mscb/src/mscb.cxx.o
[100%] Linking CXX executable sc_fe_mini
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `_readout_thread':
/home/frederik/packages/midas/src/mfe.cxx:1271: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `check_polled_events':
/home/frederik/packages/midas/src/mfe.cxx:1601: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/src/mfe.cxx:1643: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `readout_enable(unsigned int)':
/home/frederik/packages/midas/src/mfe.cxx:1158: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/src/mfe.cxx:1156: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `initialize_equipment':
/home/frederik/packages/midas/src/mfe.cxx:614: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/src/mfe.cxx:649: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `scheduler':
/home/frederik/packages/midas/src/mfe.cxx:1890: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/src/mfe.cxx:1932: undefined reference to `poll_event(int, int, unsigned int)'
/home/frederik/packages/midas/build/libmfe.a(mfe.cxx.o): In function `main':
/home/frederik/packages/midas/src/mfe.cxx:2701: undefined reference to `interrupt_configure(int, int, long)'
/home/frederik/packages/midas/src/mfe.cxx:2702: undefined reference to `interrupt_configure(int, int, long)'
collect2: error: ld returned 1 exit status
make[2]: *** [sc_fe_mini] Error 1
make[1]: *** [CMakeFiles/sc_fe_mini.dir/all] Error 2
make: *** [all] Error 2


This is my cmakelists for my user code:

#
# cmake for the muX software
#
cmake_minimum_required(VERSION 3.3)

project(muX)

#
# find installations
#
set(MIDAS_DIR $ENV{MIDASSYS})
message("MIDAS dir: " ${MIDAS_DIR})

#
# set directories
#
set(MIDASBUILD_DIR ${MIDAS_DIR}/build)
set(MIDASINCLUDE_DIR ${MIDAS_DIR}/include)
set(MXML_DIR ${MIDAS_DIR}/mxml)
set(MSCB_DIR ${MIDAS_DIR}/mscb)
set(DRV_DIR ${MIDAS_DIR}/drivers)


#
# drivers, libs
#
set(DRIVERS
    ${MIDAS_DIR}/drivers/class/hv
    ${MIDAS_DIR}/drivers/class/multi
    ${MIDAS_DIR}/drivers/device/nulldev
    ${MIDAS_DIR}/drivers/bus/null
)
set(MIDASLIB ${MIDASBUILD_DIR}/libmidas.a)
set(FELIB ${MIDASBUILD_DIR}/libmfe.a)

#
# sc_fe
#
add_executable(sc_fe_mini
        sc_fe_mini.cpp
        ${DRIVERS}
        ${MIDAS_DIR}/drivers/device/mscbdev
        ${MIDAS_DIR}/mscb/src/mscb)

target_include_directories(sc_fe_mini PRIVATE ${DRV_DIR} ${MIDAS_DIR}/mscb/include ${MIDAS_DIR}/include)
target_link_libraries(sc_fe_mini ${LIBS} ${MIDASLIB} ${FELIB} rt pthread util)



I seem to be able to compile the current midas distributions, including the scfe frontend



> To convert a MIDAS frontend to C++ follow this checklist:
> 
> a) add #include "mfe.h" after include of midas.h and fix all compilation errors.
> 
> NOTE: there should be no "extern C"  brackets around MIDAS include files.
> 
> NOTE: Expect to see following problems:
> 
> a1) duplicate or mismatched declarations of functions defined in mfe.h
> a2) frontend_name and frontend_file_name should be "const char*" instead of "char*"
> a3) duplicate "HNDLE hDB" collision with hDB from mfe.c - not sure why it worked before, either use HNDLE hDB from mfe.h or use "extern HNDLE hDB".
> a4) poll_event() and interrupt_configure() have "source" as "int[]" instead of "int" (why did this work before?)
> a5) use of "extern int frontend_index" instead of get_frontend_index() from mfe.h
> a6) bk_create() last argument needs to be cast to (void**)
> a7) "bool debug" collides with "debug" from mfe.h (why did this work before?)
> 
> b) remove no longer needed "extern C" brackets around mfe related code. Ideally there should be no "extern C" brackets anywhere.
> 
> c) in the Makefile, change CC=gcc to CC=g++ for compiling and linking everything as C++
> 
> c1) fix all compilation problems. most valid C code will compile as valid C++, but there is some known trouble:
> - return value of malloc() & co needs to be cast to the correct data type: "char* s = (char*)malloc(...)"
> - some C++ compilers complain about mismatch between signed and unsigned values
> 
> If you need help with converting your frontend from C to C++, I will be most happy
> to assist you - post your compiler error messages to this forum or email them to me privately.
> 
> Good luck,
> K.O.