Vax C90-EL SERIES Service Manual download pdf (Page 28)

Cray Standard C/C++ Reference Manual

will accept the option. Unless otherwise noted, the following default information

applies to each option:

Default option: None

Operating System: UNICOS and UNICOS/mk

Floating-point: IEEE and Cray floating point

There are many options that start with -h. Multiple -h options can be

specified using commas to separate the arguments. For example, the

-h parse_templates and -h nofastmd command line options can be

specified as -h parse_templates,nofastmd.

If conflicting options are specified, the option specified last on the command line

overrides the previously specified option. Exceptions to this rule are noted in the

individual descriptions of the options.

The following examples illustrate the use of conflicting options:

• In this example, -h nofastmd overrides -h fastmd.

CC -h fastmd,nofastmd myfile.c

• In this example, -h vector2 overrides the earlier vector optimization level 3

implied by the -O3 option.

CC -O3 -h vector2 myfile.c

Most #pragma directives override corresponding command line options. For

example, #pragma _CRI novsearch overrides the -h vsearch option.

#pragma _CRI novsearch also overrides the -h vsearch option implied by

the -h vector2 or -O2 option. Exceptions to this rule are noted in descriptions

of options or #pragma directives.

2.4 Standard Language Conformance Options

The following subsections describe standard conformance language options.

2.4.1 -h [no]c99 (cc)

Default option: -h noc99

The -h c99 option enables language features new to the C99 standard and Cray

Standard C compiler, while providing support for features that were previously

defined as Cray extensions. If the previous implementation of the Cray extension

differed from the C99 standard, both implementations will be available when

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Vax C90-EL SERIES Service Manual Page 28