frama-c gets confused by comma operator inside ternary operator: cannot cast from void to char

ID0002117: This issue was created automatically from Mantis Issue 2117. Further discussion may take place here.

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Id	Project	Category	View	Due Date	Updated
ID0002117	Frama-C	Kernel	public	2015-05-09	2016-01-26

Reporter	edwin	Assigned To	yakobowski	Resolution	fixed
Priority	normal	Severity	minor	Reproducibility	always
Platform	Linux debian 3.16.0-4-amd64 #1 S	OS	Debian GNU/Linux	OS Version	Jessie
Product Version	Frama-C Sodium	Target Version	-	Fixed in Version	Frama-C Magnesium

Description :

GCC and Clang correctly parse and compile the testcase below, however frama-c considers it invalid (cannot cast from void to char).

In (char)(1?(((x)=6),1):0) AFAICT the type of (((x)=6),1) is integer, the void on the lhs of the comma operator should be ignored.

Additional Information :

$ frama-c --version Version: Sodium-20150201 Compilation date: Thu May 7 22:46:49 EEST 2015 Share path: /home/edwin/.opam/system/share/frama-c (may be overridden with FRAMAC_SHARE variable) Library path: /home/edwin/.opam/system/lib/frama-c (may be overridden with FRAMAC_LIB variable) Plug-in paths: /home/edwin/.opam/system/lib/frama-c/plugins (may be overridden with FRAMAC_PLUGIN variable)

$ ocaml -vnum 4.01.0

I originally encountered this problem when trying to parse sqlite3 with frama-c, see the getVarint32 macro. http://www.sqlite.org/cgi/src/artifact/20d9c59fd8277450

Steps To Reproduce :

$ cat >x.c <<EOF void foo(void) { char x; (char)(1?(((x)=6),1):0); (void)((char)(1?(((x)=6),1):0)); } EOF

$ frama-c x.c [kernel] Parsing FRAMAC_SHARE/libc/__fc_builtin_for_normalization.i (no preprocessing) [kernel] Parsing x.c (with preprocessing) x.c:3:[kernel] user error: cannot cast from void to char [kernel] user error: stopping on file "x.c" that has errors. Add '-kernel-msg-key pp' for preprocessing command. [kernel] Frama-C aborted: invalid user input.