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IBM Corporation Conformance Statement

Product Standard: C Language

Organization	International Business Machines Corporation
Author	Mark S. Brown

1. C Language

Product Information

	Product Identification	Version/Release Number	Product Supplier
1.	Visual Age Compiler V5.0.1	Version 5 Release 0 Modification 1 (PID 5765-E26)	International Business Machines Corporation

Environment Specification

	Testing Environment	Binary-compatible Family	Portability Environment	Indicator of Compliance	Compliance Details
1.	IBM RS/6000	HARDWARE: Systems using Power(tm) or PowerPC (tm) architeture based processors and 8 or 128 port async cards. Systems not supported are: IBM RS/6000 models: 730 and N40. SOFTWARE: AIX Version 4.3.3 dated 10-2000 and VAC 5.0.1	Internationalised System Calls and Libraries Extended V2	Test Report from Perennial ANSI C Validation Suite	Test Suite: ACVS V4.5 Test Report: OSCC-CTR-07-CLANG

Temporary Waivers

None.

1.1 Scope of the Implementation

Question 1: What is the limit on the number of nesting levels of compound statements, iteration control structures and selection control structures?

Response

Unlimited, but limited by available memory

Question 2: What is the limit on the number of nesting levels of conditional inclusions?

Response

Question 3: What is the limit on the number of pointer, array and function declarators (in any combination) modifying an arithmetic, a structure, a union or an incomplete type in a declaration?

Response

More than or equal to 12, but Memory Limited

Question 4: What is the limit on the number of nesting levels of parenthesised declarators within a full declarator?

Response

More than or equal to 1984, but Memory Limited

Question 5: What is the limit on the number of nesting levels of parenthesised expressions within a full expression?

Response

More than or equal to 2048, but Memory Limited

Question 6: What is the number of significant initial characters in an internal identifier or macro name?

Response

Unlimited

Question 7: What is the number of significant initial characters in an external identifier?

Response

no limit by the compiler, linker limit is 4096

Question 8: What is the limit on the number of external identifiers in one translation unit?

Response

More than or equal to 511, but Memory Limited

Question 9: What is the limit on the number of identifiers with block scope declared within one block?

Response

More than or equal to 254, but Memory Limited

Question 10: What is the limit on the number of macro identifiers simultaneously defined in one translation unit?

Response

More than or equal to 1024, but Memory Limited

Question 11: What is the limit on the number of parameters in one function definition?

Response

1023

Question 12: What is the limit on the number of arguments in one function call?

Response

1023

Question 13: What is the limit on the number of parameters in one macro definition?

Response

more than or equal to 3968, but Memory Limited

Question 14: What is the limit on the number of arguments in one macro invocation?

Response

More than or equal to 3968, but Memory Limited

Question 15: What is the limit on the number of characters in a logical source line?

Response

More than or equal to 122880, but Memory Limited

Question 16: What is the limit on the number of characters in a character string literal or wide string literal (after concatenation)?

Response

Unlimited, but Memory Limited

Question 17: What is the limit on the number of bytes in an object (in a hosted environment only)?

Response

More than or equal to 32768, but Memory Limited

Question 18: What is the limit on the number of nesting levels for #included files?

Response

Question 19: What is the limit on the number of case labels for a switch statement (excluding those for any nested switch statement)?

Response

More than or equal to 257, but Memory Limited

Question 20: What is the limit on the number of members in a single structure or union?

Response

More than or equal to 127, but Memory Limited

Question 21: What is the limit on the number of enumeration constants in a single enumeration?

Response

More than or equal to 127, but Memory Limited

Question 22: What is the limit on the number of levels of nested structure or union definitions in a single struct-declaration-list?

Response

More than or equal to 15, but Memory Limited

1.2 Technical Requirements

Question 23: Are distinctions of case ignored in external identifiers?

Response

Question 24: What conversion rules are applied when converting an integral type to a floating type which cannot represent the result exactly?

Response

Convert to nearest higher or lower value depending on the rounding mode in effect. (default is nearest)

Question 25: What conversion rules are applied when converting a double to a float or a long double to a long float which cannot represent the result exactly?

Response

Convert to nearest higher or lower value depending on the rounding mode in effect. (default is nearest)

Question 26: What truncation rules are applied when using the division operator and either of the operands is negative?

Response

Truncation towards zero, sign is the exclusive OR of the signs of the two operands.

Question 27: What sign is given to the result when using the remainder operator and either of the operands is negative?

Response

If either operand of integer division is negative, the remainer is negative.

Question 28: When mapping sequences of characters to external source file names, does the implementation ignore distinctions of alphabetic case and restrict the mapping to 6 significant characters?

Response

Yes

2. C Language (X/Open C Language)

Environment Specification

	Testing Environment	Binary-compatible Family	Portability Environment	Indicator of Compliance	Compliance Details
1.	IBM RS/6000, Model F50	HARDWARE: Systems using Power(tm) or PowerPC (tm) architeture based processors and 8 or 128 port async cards. Systems not supported are: IBM RS/6000 models: 730 and N40. SOFTWARE: AIX Version 4.3.3 dated 10-2000	Internationalised System Calls and Libraries Extended	Test Report from Test Suite	Test Suite: ACVS V4.5 Test Report: OSCC-CTR-07-CLANG

Temporary Waivers

None.

2.1 Scope of the Implementation

Question 1: What limits does the implementation impose on the significant part of an identifier?

Response

External Identifier	Local (non-external) identifier
250	250

2.2 Technical Requirements

Question 2: What truncation rules are applied when a floating value is converted to an integral value?

Response

1) signed integral: truncate at decimal point; if result is too large to be an "int" or "long", result is the largest integer with the sign of the operand, unless "qhsflt" is used on the command line, in which case the result is undefined. 2) unsigned integral: truncate at decimal; if result is negative or too large to be an unsigned "int" or "long", result is the largest signed integral value assigned into an unsigned integral, unless "qhslft" is used on the command line, in which case the result is undefined.

Question 3: What truncation rules are applied when using the division operator and either of the operands is negative?

Response

Truncation towards zero.

3. Change History

Date	Name	Comment
01-Dec-2000	William L. Toth	Changed Product Identification
02-Oct-2000	William L. Toth	Updated for VAC 5.0.1 certification on AIX 4.3.3 10-2000 release
14-May-1998	William L. Toth	fixed Q20 and several invalid responses
14-May-1998	William L. Toth	New CSQ for XPG5 C language

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Home • About Us •A-Z Index• Search •

1. C Language

Product Information

Environment Specification

Temporary Waivers

1.1 Scope of the Implementation

1.2 Technical Requirements

2. C Language (X/Open C Language)

Environment Specification

Temporary Waivers

2.1 Scope of the Implementation

2.2 Technical Requirements

3. Change History