C/C++ Programmer's Guide (G06.25+)

Compiler Pragmas
HP C/C++ Programmer’s Guide for NonStop Systems—429301-008
13-40
HEAP
•
If both pragmas CPPONLY and HEADERS are specified, CPPONLY takes
precedence.
HEAP
The HEAP pragma specifies the maximum heap size of a program compiled with the
RUNNABLE pragma.
count [ { BYTES | PAGES | WORDS } ]
specifies the maximum size of the heap in terms of a number of units of a given
size. count specifies the number of units, and the keyword following count
specifies the size of each unit. If you omit a keyword, the compiler assumes
BYTES.
The pragma default settings are:
Usage Guidelines
•
If the RUNNABLE pragma is not specified, the HEAP pragma does not affect the
compilation.
•
One page equals 2048 bytes (2 kilobytes).
•
If you do not use the HEAP pragma when compiling a TNS program with the
RUNNABLE pragma, the compiler automatically provides a heap of one page.
•
For native C/C++, the HEAP pragma must be entered on the compiler RUN
command line; for TNS C and c89 in the OSS environment, the pragma can be
entered either on the compiler RUN command line or in the source text.
•
Native C and C++ programs use a different heap architecture than TNS programs.
Because of this, native C and C++ programs normally do not need to specify
maximum heap size; the default value for the heap_max attribute of a program file
is zero, indicating that the size of the heap is limited only by available resources.
HEAP count [ { BYTES | PAGES | WORDS } ]
SYSTYPE GUARDIAN SYSTYPE OSS
TNS C compiler HEAP 1 PAGES HEAP 1 PAGES
G-series TNS c89 utility HEAP 1 PAGES HEAP 1 PAGES
TNS/R native C and C++ compilers Not set
(see Usage Guidelines
)
Not set
(see Usage Guidelines)
Native c89 utility Not set
(see Usage Guidelines
)
Not set
(see Usage Guidelines)
TNS/E native C and C++ compilers Not set
(see Usage Guidelines
)
Not set
(see Usage Guidelines)