INFO | NOINFO

Pragma equivalent

#pragma info (C++ only)

Purpose

Produces groups of informational messages.

The compiler does not emit messages for files in the standard search paths for the compiler and system header files.

Syntax

For C:

For C++:

Defaults

For C++ in the z/OS® UNIX System Services, the default is INFO(LAN) and NOINFO in batch. For C, the default option is NOINFO.

Parameters

subopts: Use subopts if you want to specify the type of warning messages.

A list of the applicable subopts is as follows:

ALS | NOALS: Emits report on possible violations of the ANSI aliasing rule in effect.
(C only) The traceback diagnostic messages refer to the character number as the column number.
CLS | NOCLS: Emits class informational warning messages (C++ only).
CMP | NOCMP: Emits conditional expression check messages.
CND | NOCND: Emits messages on redundancies or problems in conditional expressions.
CNV | NOCNV: Emits messages about conversions.
CNS | NOCNS: Emits redundant operation on constants messages.
CPY | NOCPY: Emits warnings about copy constructors (C++ only).
EFF | NOEFF: Emits information about statements with no effect.
ENU | NOENU: Emits information about ENUM checks.
EXT | NOEXT: Emits warnings about unused variables that have external declarations.
GEN | NOGEN: Emits messages if the compiler generates temporaries, and diagnoses variables that are used without being initialized.
GNR | NOGNR: Emits information about the generation of temporary variables (C++ only).
LAN | NOLAN: Emits language level checks.
PAR | NOPAR: Emits warning messages on unused parameters.
POR | NOPOR: Emits warnings about non-portable constructs.
PPC | NOPPC: Emits messages on possible problems with using the preprocessor.
PPT | NOPPT: Emits trace of preprocessor actions.
PRO | NOPRO: Emits warnings about missing function prototypes.
REA | NOREA: Emits warnings about unreached statements.
RET | NORET: Emits warnings about return statement consistency.
STP | NOSTP: Emits warnings for procedures that are not protected against stack corruption. The INFO(STP) option has no effect unless the STACKPROTECT option is also enabled.
TRD | NOTRD: Emits warnings about possible truncation of data.
UND | NOUND: Emits warnings about undefined classes (C++ only).
USE | NOUSE: Emits information about usage of variables.
VFT | NOVFT: Indicates where vftable is generated (C++ only).
ALL: Enables all of the suboptions except ALS and PPT. Suboptions ALS and PPT have to be turned on explicitly.

Usage

Note: The INFO option may not produce the same diagnostic messages as the previous releases.

Start of change If you specify INFO with no suboptions, the suboptions of INFO that do not conflict with other options are enabled while the suboptions that conflict with other options are disabled. INFO(ALL) has the same effect as the INFO option with no suboptions except that the compiler emits warning messages for suboptions that are disabled due to conflicts with other options. End of change

The following information describes how to use INFO as a replacement for CHECKOUT and still retrieve the same messages:

Table 1. Migrating from CHECKOUT to INFO
CHECKOUT suboption	Equivalent INFO suboption
ACCURACY	TRD
CAST	GEN Note: Use INFO(GEN) to provide the same messages as CHECKOUT(CAST) and the following messages: some general messages messages for appearance and usage of goto statements messages for variables that are not explicitly initialized messages for obsolete features messages for ambiguous evaluation order
ENUM	ENU
EXTERN	EXT
GENERAL	Use one of the following options: INFO(CMP,CND,CNS,CNV,EFF,LAN, PRO,REA,RET,USE,GEN) Note: Use these options to provide the same messages as CHECKOUT(GENERAL) and messages for CHECKOUT(CAST,GOTO,INIT). INFO(CMP,CND,CNS,CNV,EFF,LAN, PRO,REA,RET,USE) Note: Use these options to provide the same messages as CHECKOUT(GENERAL), but not the messages for obsolete features and ambiguous evaluation order.
GOTO	GEN Note: Use INFO(GEN) to provide the same messages as CHECKOUT(GOTO) and the following messages: some general messages messages for obsolete features messages for ambiguous evaluation order messages for CHECKOUT(CAST, INIT)
INIT	GEN Note: Use INFO(GEN) to provide the same messages as CHECKOUT(INIT) and the following messages: some general messages messages for obsolete features messages for ambiguous evaluation order messages for CHECKOUT(CAST, GOTO)
PARM	PAR
PORT	POR
PPCHECK	PPC
PPTRACE	PPT
TRUNC	USE Note: INFO(USE) provides more messages than CHECKOUT(TRUNC).
ALL	ALL
NONE	NOINFO

Note: If you specify CHECKOUT with no suboptions, it is the same as specifying INFO(ALL).

IPA effects

The STP and NOSTP suboptions are the only INFO suboptions that take effect during the IPA link step while other INFO subotpions are ignored. If you specify the INFO(STP) option for any compilation unit in the IPA compile step, the compiler generates information for the IPA link step. This option also affects the regular object module if you request one by specifying the IPA(OBJECT) option.

The IPA link step merges and optimizes the application code; then the IPA link step divides it into sections for code generation. Each of these sections is a partition.

If you specify the INFO(STP) option on the IPA link step, it uses the value of that option for all partitions. The IPA link step Prolog and all Partition Map sections of the IPA link step listing display that value.

If you do not specify the option on the IPA link step, the value used for a partition depends on the value that you specified for the IPA compile step for each compilation unit that provided code for that partition.

The object module and the Partition Map section of the IPA link step listing display the final option value for each partition. If you override this option on the IPA link step, the Prolog section of the IPA link step listing displays the value of the option.

The Compiler Options Map section of the IPA link step listing displays the option value that you specified for each IPA object file during the IPA compile step.

Predefined macros

None.

Related information

STACKPROTECT | NOSTACKPROTECT