User's Guide

Writing Code for both Compilers
Use the __cplusplus macro (defined by the draft standard) to write code that can be compiled
by both HP C++ and HP aC++.
Example:
#if __cplusplus >= 199707L
// HP aC++ code
#else
// HP C++ code
#endif // __cplusplus >= 199707L
Explicit Loading and Unloading of Shared Libraries
HP aC++ uses system calls rather than C++ function calls to explicitly load and unload shared
libraries. When migrating to HP aC++, make the following source code changes:
• Change cxxshl_load() to shl_load().
• Change cxxshl_unload() to shl_unload().
• Change #include <cxxdl.h> to #include <dl.h>.
Memory Allocation
See “Memory Allocation Failure and operator new” (page 203) for more information.
Command-Line Differences
In HP aC++, you invoke the compiler with the aCC command instead of the CC command used to
invoke HP C++.
The following sections describe differences in command-line options:
• “New Command-Line Options” (page 199)
• “Obsolete Command-Line Options” (page 200)
• “Changed Command-Line Options” (page 201)
New Command-Line Options
Table 12 describes the new options for HP aC++. These options are not available for HP C++
(cfront). However, if a related option exists, it is noted here.
See Chapter 2: “Command-Line Options” (page 31) to for a complete list of HP aC++ command-line
options.
Table 12 New Command-Line Options
DescriptionOption
Replaces the -g debugger option. It generates complete debug information for the debugger.-g0
Invokes the HP aC++ Online Programmer’s Guide.+help
Disables exception handling. In HP aC++, exception handling is enabled by default.+noeh
In HP C++ (cfront), exception handling is disabled by default. To enable it, use the +eh option,
which is obsolete in HP aC++.
Command-Line Differences 199