C/C++ Programmer's Guide (G06.27+, H06.08+, J06.03+)

For the padding and alignment of members of structures, all fields are aligned on 16-bit boundaries,
except characters that are aligned on byte boundaries.
The equivalent type for a plain int bit field is:
• signed int bit field
• unsigned int bit field
The order of allocation of bit fields within an int is high order to low order.
A bit field cannot straddle a storage-unit boundary.
The int integer type has been chosen to represent the values of an enumeration type.
G.3.10 Qualifiers
An access through an lvalue is needed to access a volatile-qualified type object.
G.3.11 Declarators
There is no practical limit to the maximum number of declarators that may modify an arithmetic,
structure, or union type.
G.3.12 Statements
The maximum number of case values in a switch statement is MAX_INT.
G.3.13 Preprocessing Directives
The value of a single-character character constant in a constant expression that controls conditional
inclusion does match the value of the same character constant in the execution character set. Such
a character constant can have a negative value.
The method used for locating includable source files is:
• In the Guardian environment, for #include “filename” the current subvolume is searched
or the subvolume search list specified by pragma ssv0 through ssv9 is searched, ssv0
first and ssv9 last. For #include"subvol.filename" the current volume is searched or
the volume search list specified by pragma ssv0 through ssv9 is searched, ssv0 first and
ssv9 last.
• In the Guardian environment for #include "filename", if the include file does not have
an absolute pathname, they will be searched first in the directory of the file with #include
line, then in the directory named in -I option of c89 utility and last in /usr/include.
• In the Guardian environment, for #include <filename>, the file is searched for in the
compiler subvolume unless the search subvolumes (SSVs) are specified. If SSVs are specified,
the SSVs are searched first and then the compiler subvolume.
• In the OSS environment on NonStop S-series systems, for #include <filename>, if the
file does not have an absolute pathname, it is searched for first in the directory named in the
-I option of the c89 utility and then in the /usr/include directory.
Quoted names are supported for includable source files.
The mapping between delimited character sequences and an external source file name is:
• In the Guardian environment, it is a one-to-one mapping; except that when a file ends in ".h",
the "." is removed.
• In the OSS environment on NonStop S-series systems, it is a one-to-one mapping.
For a description of the behavior of each recognized #pragma directive, see Chapter 13: Compiler
Pragmas.
The date and time of translation are always available.
G.3.14 Library Functions
OL is the null pointer constant to which the macro NULL expands.
410 HP C Implementation-Defined Behavior