Building on Ubuntu Server 20.10

[Andreas711]

Hello,

I recently installed Ubuntu Server 20.10 64bit on my raspberry pi 3 b rev 1.2.

When I go to "sudo make", I get this error

<< g++ -Wall -O3 -std=c++11 -DVERSION=\"0.9.4\" -DEXECUTABLE=\"fm_transmitter\" -c main.cpp g++ -Wall -O3 -std=c++11 -c mailbox.c mailbox.c: In function ‘void mapmem(unsigned int, unsigned int)’: mailbox.c:64:33: error: cast from ‘void’ to ‘int’ loses precision [-fpermissive] 64 | printf("mmap error %d\n", (int)mem); | ^~~~ make: *** [makefile:13: mailbox.o] Error 1

Someone please help!

Andreas

[Andreas711]

I had a look at a previous Issue and found that I should add "FLAGS = -Wall -O3 -std=c++11 -fpermissive" to line 3 of the makefile. I did this, and it makes more progression but fails again...

Here is the error << g++ -Wall -O3 -std=c++11 -fpermissive -c mailbox.c mailbox.c: In function ‘void mapmem(unsigned int, unsigned int)’: mailbox.c:64:33: warning: cast from ‘void’ to ‘int’ loses precision [-fpermissive] 64 | printf("mmap error %d\n", (int)mem); | ^~~~ g++ -Wall -O3 -std=c++11 -fpermissive -c sample.cpp g++ -Wall -O3 -std=c++11 -fpermissive -c wave_reader.cpp g++ -Wall -O3 -std=c++11 -fpermissive -fno-strict-aliasing -I/opt/vc/include -c transmitter.cpp transmitter.cpp:36:10: fatal error: bcm_host.h: No such file or directory 36 | #include | ^~~~ compilation terminated. make: *** [makefile:22: transmitter.o] Error 1

[themoonwatcher]

It looks like you have to find the sources of the Rpi's userland files and fill the /opt/vc/include directory.

[Andreas711]

How do I go about doing this?

[dengjy-vi]

I have the same problem

[qxliang2014]

I have the exactly same issue on RaspberryPi 4b with Ubuntu Server 20.10,still trying to fix it...

[rsaxvc]

I think there's a better way than -fpermissive. I'll put up a patch.

But you also need the Broadcom headers and libraries. For RPiOS you would do this if they are not installed, sudo apt-get install libraspberrypi-dev raspberrypi-kernel-headers , but I'm not sure about Ubuntu Server 20.10.

[markondej]

Works fine after @rsaxvc fixes