I get the error while building the AOSP source code: POSIX Yacc does not support %name-prefix [-Wyacc]
more detail:
10 | %token-table
| ^~~~~~~~~~~~
external/iproute2/tc/emp_ematch.y:11.1-14: warning: POSIX Yacc does not support %error-verbose [-Wyacc]
11 | %error-verbose
| ^~~~~~~~~~~~~~
external/iproute2/tc/emp_ematch.y:11.1-14: warning: deprecated directive: ‘%error-verbose’, use ‘%define parse.error verbose’ [-Wdeprecated]
11 | %error-verbose
| ^~~~~~~~~~~~~~
| %define parse.error verbose
external/iproute2/tc/emp_ematch.y:12.14-22: warning: POSIX Yacc does not support string literals [-Wyacc]
12 | %name-prefix "ematch_"
| ^~~~~~~~~
external/iproute2/tc/emp_ematch.y:12.1-22: warning: POSIX Yacc does not support %name-prefix [-Wyacc]
12 | %name-prefix "ematch_"
| ^~~~~~~~~~~~~~~~~~~~~~
external/iproute2/tc/emp_ematch.y:12.1-22: warning: deprecated directive: ‘%name-prefix "ematch_"’, use ‘%define api.prefix {ematch_}’ [-Wdeprecated]
12 | %name-prefix "ematch_"
| ^~~~~~~~~~~~~~~~~~~~~~
| %define api.prefix {ematch_}
12:13:00 ninja failed with: exit status 1
After a few hours, I found it was because of the m4 package that was not installed on my machine, The solution is just run:
sudo apt install m4
And continue to build.