[Bug 106] New: Should expoit warn_unused_result GCC attribute

http://sablevm.org/bugs/show_bug.cgi?id=106

           Summary: Should expoit warn_unused_result GCC attribute
           Product: SableVM
           Version: unspecified
          Platform: PC
               URL: http://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Function-
                    Attributes.html#Function-Attributes
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: default
        AssignedTo: [email protected]
        ReportedBy: [email protected]
         QAContact: [email protected]


GCC offers an extension (in form of an attribute) that allows us to generate
a warning if the result returned by a function marked with this attribute is
ignored.

From:
http://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Function-Attributes.html#Function-Attributes

"The warn_unused_result attribute causes a warning to be emitted if a caller
of the function with this attribute does not use its return value. This is
useful for functions where not checking the result is either a security
problem or always a bug, such as realloc.

          int fn () __attribute__ ((warn_unused_result));
          int foo ()
          {
            if (fn () < 0) return -1;
            fn ();
            return 0;
          }
     
results in warning on line 5."

SableVM contains many function that return JNI_ERR in case of an error and
with this attribute we could ensure that values returned by these functions
are not ignored.



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