Compilation error of bison generated code with gcc11

[d-otte]

Symptom

Invoking make all generates the following error message (using gcc11, which is the default gcc in ubuntu 21.10):

[...]
Compiling erpcgen/src/options.cpp
Compiling erpcgen/src/types/Type.cpp
<build-dir>/erpc/Debug/Linux/erpcgen/obj/erpcgen_parser.tab.cpp: In function 'int yyparse(erpcgen::ErpcLexer*, erpcgen::AstNode**)':
<build-dir>/erpc/Debug/Linux/erpcgen/obj/erpcgen_parser.tab.cpp:3810:18: error: 'void free(void*)' called on unallocated object 'yyssa' [-Werror=free-nonheap-object]
 3810 |     YYSTACK_FREE (yyss);
<build-dir>/erpc/Debug/Linux/erpcgen/obj/erpcgen_parser.tab.cpp:2025:16: note: declared here
 2025 |     yy_state_t yyssa[YYINITDEPTH];
      |                ^~~~~
At global scope:
cc1plus: note: unrecognized command-line option '-Wno-deprecated-register' may have been intended to silence earlier diagnostics
cc1plus: all warnings being treated as errors
make[1]: *** [<build-dir>/erpc/mk/targets.mk:97: <build-dir>/erpc/Debug/Linux/erpcgen/obj/Debug/Linux/erpcgen/obj/erpcgen_parser.tab.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [<build-dir>/erpc/mk/subdirs.mk:42: erpcgen] Error 2

Cause

1. invoking gcc11 with -O0 causes a false warning for freeing a non heap object.
2. invoking gcc with the -Werror flag causes the warning to become an error.

Code generated with bison is known to cause this issue (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98753).

Workaround

Invoking make with CXXFLAGS=-Wno-error=free-nonheap-object turns this specific error back into a warning.

[github-actions]

Hi eRPC user. Thank you for your interest and welcome. We hope you will enjoy this framework well.

[Hadatko]

PR was merged