HP Code Advisor

Example 8-7 Signed bit field of length 1
Cadvise warns cases where signed bit field of length 1 is being used and then assigned with a
value, which is excessive of its size.
For example, see the tags in the following code:
$ cat bitfield.c
struct { int bit:1; } s;
void test()
{
s.bit = 1;
}
In such cases, cadvise generates the following warnings:
"bitfield.c", line 1: warning #2108-D: signed bit field of length 1
struct { int bit:1; } s;
^
"bitfield.c", line 5: warning #4251-D: the assignment has an excessive
size for a bit field
s.bit = 1;
^
8.3 Detecting 32–bit to 64–bit Migraton Issues
The +w64bit option enables warnings that help detection of potential problems in converting
32-bit applications to 64-bit. The +w64bit option applies only to a 64-bit compile (using
+DD64). This option is equivalent to the +M2 option. Following are some of the checks performed
by this option:
• 64–bit value is implicitly converted to a 32 bit value, for example, long to int.
• Pointer to a 4-byte aligned object is implicitly converted to a pointer to a 8-byte aligned
object.
For example, see the following code:
Example 8-8 Detecting 32–bit to 64–bit migraton issues
$ cat convert.c
int *int_to_ptr (int i)
{
return (int *)i;
}
In such cases, cadvise generates the following warning:
"convert.c", line 3: warning #4231-D: 64 bit migration: conversion
between types of different sizes has occurred
(from "int" to "int *" )
return (int *)i;
^
8.4 Detecting Endianness Migration Issues
The +wendian option helps you to detect code fragments which are endian dependent. The
following example shows the detection of endian dependent code fragments.
8.3 Detecting 32–bit to 64–bit Migraton Issues 61