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.**
---
| **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.
issue