HP aC++/HP C A.06.25 Programmer's Guide

If the +check=bounds:pointer is on, +check=uninit will check pointer access

for uninitialized memory read (UMR). To enable checking, the runtime system will

initialize the heap objects and stack variables with a special pattern. If the pointer

accesses an area containing the specified pattern for the specified length, then it assumes

the read is UMR. To minimize UMR false positive, the user may change the special

pattern and number of bytes to check by using RTC_UMR environment variable:

RTC_UMR=[INIT=0xnn][:CHECK_SIZE=sz]

where:

• INIT specifies the char type value used to initialize heap/local objects. The default

pattern is 0xDE.

• CHECK_SIZE specifies the minimum number of bytes used to check for UMR.

The default number is 2.

Also see the +Oinitcheck option to enable compile-time warnings for variables that

may be used before they are set.

Standards Related Options

The compiler accepts the following options related to the ANSI/ISO 9899-1990 Standard

for the C Programming Language, the ANSI/ISO International Standard, and ISO/IEC 14882

Standard for the C++ Programming Language:

-Aa

The -Aa option instructs the compiler to use Koenig lookup and strict ANSI for scope

rules. This option is equivalent to specifying -Wc,-koenig_lookup,on and

-Wc,-ansi_for_scope,on.

The default is on for C++, but off for C. Refer to the -Ae option for C-mode description.

The standard features enabled by -Aa are incompatible with earlier C and C++ features.

-AA

The -AA option enables the use of the new 2.0 Standard C++ Library, which includes

the new standard conforming (templatized) iostream library. It conforms to the ISO

C++ standard.

The –AA option sets -Wc,-koenig_lookup,on and -Wc,-ansi_for_scope,on,

and is the default C++ compilation mode.

Usage:

The standard features enabled by -AA are incompatible with the older Rogue Wave

Standard C++ Library 1.2.1 and Tools.h++ 7.0.6. All modules must be consistent in using

-AA. Mixing modules compiled with -AA with ones that are not is not supported.

110 Command-Line Options