Yikes, the error is in the CRC library. The assembly-optimized crc32c function fails to build, and the 
error does not look familiar to me. I do not see this error here. What is your host system ("uname -
a") and what is your gcc ("gcc -v")?

BTW, "make linux32" will build an Intel 32-bit version (see "-m32" in "man gcc"). For ARM 32-bit 
you need a different switch, I think, also depending how you are cross-compiling it.

For straight cross-compilation, look at the Makefile target "make linuxarm" (you will need to change 
the location of your ARM gcc cross-compiler).

For running MIDAS frontend on the Raspberry Pi 3, I build MIDAS on the Pi3 itself, the machine is big 
enough to run CentOS7 linux and gcc to build the full MIDAS.

But if you have a different cross-compilation scheme, I am happy to help you and to add your 
scheme to the MIDAS Makefile. We can start by looking at "uname -a" and "gcc -v" and "lsb_release 
-a" (if you have it).

K.O.


> Hi, we are part of the Mu3e research based at University of Bristol. We have a 
> remote 32 bit frontend (raspberry pi) connected to a 64 bit Data Acquisition 
> system.we are following the instructions at installation/quickstart linux/Build 
> 32-bit MIDAS libraries. when we execute the commands: 
> [mhostpc] cd /home/packages/midas
> [mhostpc] make linux32             
> 
> we get an error:
> 
> make NO_ROOT=1 NO_MYSQL=1 NO_ODBC=1 NO_SQLITE=1 OS_DIR=linux-m32 USERFLAGS=-
m32
> make[1]: Entering directory `/home/hh19285/packages/midas'
> g++ -m32 -c -g -O2 -Wall -Wno-strict-aliasing -Wuninitialized -Iinclude -
> Idrivers -Imxml -Imscb/include -DHAVE_FTPLIB -D_LARGEFILE64_SOURCE -DHAVE_ZLIB -
> DHAVE_MSCB -DHAVE_MONGOOSE6 -DMG_ENABLE_THREADS -DMG_DISABLE_CGI -
DMG_ENABLE_SSL 
> -DOS_LINUX -fPIC -Wno-unused-function -o lib/crc32c.o src/crc32c.cxx
> src/crc32c.cxx: In function ‘uint32_t crc32c_hw(uint32_t, const void*, size_t)’:
> src/crc32c.cxx:283:66: error: ‘asm’ operand has impossible constraints
>                      : "r"(next), "0"(crc0), "1"(crc1), "2"(crc2));
>                                                                   ^
> src/crc32c.cxx:303:66: error: ‘asm’ operand has impossible constraints
>                      : "r"(next), "0"(crc0), "1"(crc1), "2"(crc2));
>                                                                   ^
> src/crc32c.cxx: In function ‘uint32_t crc32c(uint32_t, const void*, size_t)’:
> src/crc32c.cxx:348:34: error: PIC register clobbered by ‘%ebx’ in ‘asm’
>                  : "%ebx", "%edx"); \
>                                   ^
> src/crc32c.cxx:362:5: note: in expansion of macro ‘SSE42’
>      SSE42(sse42);
>      ^
> make[1]: *** [lib/crc32c.o] Error 1
> make[1]: Leaving directory `/home/hh19285/packages/midas'
> make: *** [linux32] Error 2
> 
> Could you please help with getting past this? otherwise we may need to change 
> our whole experimental setup.
> 
> Thank you in advance