This is my list of disabled compiler warnings (using GCC in "absolutely most
pedantic" mode) required to compile sqlite (and even omitting FTS and some
other stuff).
-Wno-aggregate-return
-Wno-bad-function-cast
-Wno-cast-qual
-Wno-empty-body
-Wno-format-extra-args
-Wno-format-nonliteral
-Wno-format-security
-Wno-old-style-definitions
-Wno-parentheses
-Wno-pointer-sign
-Wno-return-type
-Wno-shadow
-Wno-sign-compare
-Wno-strict-prototypes
-Wno-switch-default
-Wno-undef
-Wno-uninitialized
-Wno-unused-function
-Wno-write-strings
See gcc docs for explanation of which constructs lead to these warnings
-Ursprüngliche Nachricht-
Von: Matthias Schmitt [mailto:freak...@mmp.lu]
Gesendet: Donnerstag, 09. Jänner 2014 11:09
An: General Discussion of SQLite Database
Betreff: [sqlite] Compiler warning: Unused variable 'pFd'
Hello,
I am using SQLite 3.8.2 for my iOS projects in Xcode 5.0.2. After updating to
version 3.8.2 I am getting the following compiler warning:
sqlite3.c:28141:13: Unused variable 'pFd'
When looking into the code I see starting at line 28141:
static int unixUnfetch(sqlite3_file *fd, i64 iOff, void *p){
unixFile *pFd = (unixFile *)fd; /* The underlying database file */
UNUSED_PARAMETER(iOff);
#if SQLITE_MAX_MMAP_SIZE>0
. the code of the function
#endif
return SQLITE_OK;
}
Obviously the compiler switch "#if SQLITE_MAX_MMAP_SIZE>0" instructs the
compiler to ignore the code inside the switch on my platform. As a result the
variable "pFd" is never used and results in an ugly warning message. Would it
be better to include the variable declaration inside the compiler switch to
protect from this warning? So the code would look like this:
static int unixUnfetch(sqlite3_file *fd, i64 iOff, void *p){ #if
SQLITE_MAX_MMAP_SIZE>0
unixFile *pFd = (unixFile *)fd; /* The underlying database file */
UNUSED_PARAMETER(iOff);
. the code of the function
#endif
return SQLITE_OK;
}
Best regards
Matthias Schmitt
magic moving pixel s.a.
23, Avenue Grande-Duchesse Charlotte
L-3441 Dudelange
Luxembourg
Phone: +352 54 75 75 - 0
http://www.mmp.lu
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