Emacs GDB garbled output

[Augusto Fraga Giachero]

Hello Emacs users!

I've been using Emacs + GDB (GUD) for debugging programs written in C 
since more or less 2 years. I generally recompile my projects by just 
invoking 'make' in the GDB shell.

What bothers me is that when the build process outputs a lot of text in 
a short period of time (such a compile error or warnings) the GDB shell 
doesn't catch all the text, and sometimes part of the text is displayed 
when the next command is executed. For example:

GDB under Emacs:
(gdb) make
gcc -MMD -c -g -Wall -I inc/ -Og src/testlib.c -o src/testlib.o
src/testlib.c:4:1: error: expected ‘ int isPrime(uint64_t num)
 stop
make: (gdb)

Standalone GDB:
gcc -MMD -c -g -Wall -I inc/ -Og src/testlib.c -o src/testlib.o
src/testlib.c:4:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘int’
 int isPrime(uint64_t num)
 ^~~
make: *** [Makefile:27: src/testlib.o] Error 1

Anyone that have experienced this behavior known how to fix it?

Thanks,
Augusto Fraga Giachero.