The code does not compile on ubuntu 20.04/gcc 9.4 after recent change in compilersupport_p.h #293
Description
Compiling on gcc9.4 gives the following error:
It can be reproduced by creating an ubuntu:20.04 container and compiling the software in that context.
/usr/bin/cc -DCBOR_NO_FLOATING_POINT -DCBOR_STATIC_DEFINE -I/sandbox/tinycbor/src -I/sandbox/tinycbor/build -std=c99 -Wall -Wextra -Werror=format-security -Werror=incompatible-pointer-types -Werror=implicit-function-declaration -Werror=int-conversion -MD -MT CMakeFiles/tinycbor.dir/src/cborparser.c.o -MF CMakeFiles/tinycbor.dir/src/cborparser.c.o.d -o CMakeFiles/tinycbor.dir/src/cborparser.c.o -c /sandbox/tinycbor/src/cborparser.c
In file included from /sandbox/tinycbor/src/cborinternal_p.h:35,
from /sandbox/tinycbor/src/cborparser.c:28:
/sandbox/tinycbor/src/cborparser.c: In function 'preparse_value':
/sandbox/tinycbor/src/compilersupport_p.h:57:41: error: expected expression before '[' token
57 | # define CBOR_FALLTHROUGH [[fallthrough]]
| ^
/sandbox/tinycbor/src/cborparser.c:225:13: note: in expansion of macro 'CBOR_FALLTHROUGH'
225 | CBOR_FALLTHROUGH;
| ^~~~~~~~~~~~~~~~
/sandbox/tinycbor/src/compilersupport_p.h:57:43: error: 'fallthrough' undeclared (first use in this function)
57 | # define CBOR_FALLTHROUGH [[fallthrough]]
| ^~~~~~~~~~~
/sandbox/tinycbor/src/cborparser.c:225:13: note: in expansion of macro 'CBOR_FALLTHROUGH'
225 | CBOR_FALLTHROUGH;
| ^~~~~~~~~~~~~~~~
/sandbox/tinycbor/src/compilersupport_p.h:57:43: note: each undeclared identifier is reported only once for each function it appears in
57 | # define CBOR_FALLTHROUGH [[fallthrough]]
| ^~~~~~~~~~~
/sandbox/tinycbor/src/cborparser.c:225:13: note: in expansion of macro 'CBOR_FALLTHROUGH'
225 | CBOR_FALLTHROUGH;
| ^~~~~~~~~~~~~~~~
/sandbox/tinycbor/src/cborparser.c:224:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
224 | it->flags |= CborIteratorFlag_IntegerValueTooLarge;
| ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/sandbox/tinycbor/src/cborparser.c:226:9: note: here
226 | case TrueValue:
| ^~~~
make[2]: *** [CMakeFiles/tinycbor.dir/build.make:118: CMakeFiles/tinycbor.dir/src/cborparser.c.o] Error 1
make[2]: Leaving directory '/sandbox/tinycbor/build'
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/tinycbor.dir/all] Error 2
make[1]: Leaving directory '/sandbox/tinycbor/build'
make: *** [Makefile:136: all] Error 2
root@c72c7b9f59f6:/sandbox/tinycbor/build# /usr/bin/cc --version
cc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0
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