HP aC++/HP C A.06.25 Release Notes
Table Of Contents
- HP aC++/HP ANSI C Release Notes
- Table of Contents
- 1 HP aC++/HP ANSI C Release Notes
- 2 What’s New in This Version
- New Features in Version A.06.25
- C99 default C compilation mode (Changed)
- Full -AA default C++ compilation mode (Changed)
- -Ax option enables support for several C++0x extensions (New)
- C99 features added to C++0x (New)
- extern template
- Decimal Floating Point supported in C++ mode (New)
- #pragma STDC FLOAT_CONST_DECIMAL64 (New)
- #pragma omp task (New)
- #pragma omp taskwait (New)
- Performance enhancements for +O1 (Changed)
- Non-template static data members initialized outside the class no longer treated as constants in strict mode (Changed)
- Enhancements to allow code to run well on current platforms and future multi-core processors (New)
- New diagnostic messages (New)
- Improved diagnostic messages (Changed)
- Enhanced +wendian warnings (New/Changed)
- New runtime abort messages (New)
- New Features in Version A.06.20
- Decimal floating-point arithmetic (HP-UX 11.31 only) (New)
- +annotate=structs (New)
- +check=lock (New)
- +check=thread (New)
- +O[no]autopar now supported in C++ Mode (New)
- +O[no]dynopt (HP-UX 11.31 only) (New)
- +inline_level num (Enhanced)
- -dumpversion (New)
- #include_next (New)
- #pragma diag_push (New)
- #pragma diag_pop (New)
- +Oinlinebudget is deprecated (Change)
- In next release, default C compilation mode will change from C89 to C99
- In next release, default C++ compilation mode will change to full -AA
- New Features in Version A.06.15
- printf, fprintf Optimization (New)
- +Wmacro Option (New)
- +Wcontext_limit Option (New)
- +wperfadvice Option (New)
- +Wv Option (New)
- +wlock Option (New)
- +O[no]autopar Option (New)
- +O[no]loop_block Option (New)
- +O[no]loop_unroll_jam (Default Change)
- +Olit=all (Default Change for HP C)
- +macro_debug= (New)
- +pathtrace (New)
- +check Suboptions (New)
- -Bhidden_def (New)
- -dM (New)
- #pragma OPT_LEVEL INITIAL (New)
- #pragma OPTIMIZE (Deprecated)
- #pragma [NO]INLINE (New for C++ Mode)
- _Asm_ld, _Asm_ldf, _Asm_st, _Asm_stf Intrinsics (New)
- Debugging Code Compiled with Opt Levels above +O1 Is Supported
- __attribute__ ((visibility("default"|"protected"|"hidden"))) Added (New)
- __attribute__ ((warn_unused_result)) Added (New)
- Change in treatment of cv-qualified assignment operators
- New Features in Version A.06.12
- New Features in Version A.06.10
- HP Code Advisor
- +cond_rodata Option (Obsoleted)
- +[no]dep_name Option (New)
- +expand_types_in_diag Option (New)
- +FPmode Option (Enhanced)
- +Ointeger_overflow (Default Changed)
- +Onolibcalls= Option (New)
- +wendian Option (New)
- +wlint Option (Enhanced)
- +wsecurity= Option (Enhanced)
- System-wide Option Configuration
- [NO]PTRS_TO_GLOBALS Pragma
- -AA -D_HP_NONSTD_FAST_IOSTREAM Performance Improvement Macro
- New Function Attributes
- Improved Diagnostics
- C++ Standard Library Change
- Earlier Versions
- New Features in Version A.06.25
- 3 Installation Information
- 4 Compatibility Information
- 5 Known Problems and Workarounds
- Obsolete LANG-STARTUP Files
- codecvt_byname Facet Needed for C Locale Conversions
- Using +check= Options and Running on Test and Deployment Systems
- GPREL22 Relocation Error
- Object Files Generated at +O4 or -ipo
- Incompatibilities Between the Standard C++ Library Ver. 1.2.1 and the Draft Standard
- Conflict Between macros.h and numeric_limits Class (min and max)
- Known Limitations
- 6 Related Documentation

This will insure that, when the application is migrated to a system that has a later
version of libA available, the actual version desired is the one that is dynamically
loaded.
• Memory Allocation Routine alloca()
The compiler supports the built in function, alloca, defined in the
/usr/include/alloca.h header file. The implementation of the alloca() routine is
system dependent, and its use is not encouraged.
alloca() is a memory allocation routine similar to malloc() (see malloc(3C)).
The syntax is:
void *alloca(size_t <size>);
alloca() allocates space from the stack of the caller for a block of at least <size>
bytes, but does not initialize the space. The space is automatically freed when the
calling routine exits.
NOTE: Memory returned by alloca() is not related to memory allocated by
other memory allocation functions. Behavior of addresses returned by alloca()
as parameters to other memory functions is undefined.
To use this function, you must use the <alloca.h> header file.
Known Limitations 51