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
template<class T>
struct S {
static_assert(sizeof(T) > 4, "Type too small");
};
S<char> s1; // Will trigger an error when the static_assert
// declaration is instantiated.
Extended friend types
Support is now included for extended friend declaration syntax which allows for
non-class names and non-elaborated class names to be declared as friend.
Example:
typedef struct S ST;
typedef int const IC;
class C {
friend S; // Okay in C++0x mode
friend ST; // Okay in C++0x mode
friend int; // Okay in C++0x mode (but no effect)
friend IC; // Okay in C++0x mode (but no effect)
friend int const; // Error: cv-qualifiers not (directly) allowed
};
Rvalue references
Rvalue references are supported. This feature is enabled implicitly in C++0x mode.
The existence of rvalue references allows the declaration of move constructors, which
can be used to efficiently copy class objects by transferring the resources from a source
object that is soon to be defunct to a destination object.
The syntax for declaring an rvalue-reference is: typename&& rRef (as opposed to
the lvalue syntax: typename& lRef). The move constructor simply takes an rvalue
or lvaue reference and returns an rvalue reference. This prevents invocation of the copy
constructor; it therefore 'moves' around references without the need for copying the
objects.
Note that new mangling forms have been added for rvalue references; this matches
the Itanium ABI specification. The demangler c++filt has been updated to handle
these new encodings.
Example:
int& ref = 10; //Error; references must bind to lvalues.
int&& const_ref = 20; //C++0x rvalue references bind to rvalues.
Objectless references to non-static data members
In the 2003 C++ Standard, the name of a non-static class data member could appear
only in a member function of that class or one derived from it, in a member access
expression (x.m or p->m), or to form a pointer to member (&X::m).
12 What’s New in This Version