H-Series Application Migration Guide (H06.03+)

Contents

H-Series Application Migration Guide—429855-006

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5. Native C and C++ Migration Tasks

Using the TNS/E Native C and C++ Compilers 5-1

Possible Source Code Changes 5-2

Check Programs that Use NaN Values 5-2

Change Programs that Rely on Proprietary Floating-Point Format 5-2

Check C/C++ Main Routine Object File Name 5-2

Check Programs With Variable-Length Parameter Lists 5-3

Using setjmp() in Functions Marked as Inline 5-3

Using the semctl() Function With a Fourth Parameter 5-3

Check Use of Feature Test Macro 5-4

Changed Pragmas and Flags 5-4

Changed Pragmas 5-5

INSPECT/NOINSPECT Pragmas Select Different Debuggers 5-5

C89 Flags Changed 5-6

Using Conditional Compilation in C and C++ Programs 5-6

Native C and C++ Run-Time Library and Tools.h++ Migration Issues 5-7

Library Names Changed 5-8

Tools.h++ Version 6 Class Library Not Supported 5-8

Toolsh++ TLHMAP File Names Changed 5-8

Migrating to the C++ Standard Library VERSION2 5-9

Migrating to the C++ Standard Library VERSION3 5-9

LIBCOBEY and libc.obey Files Replaced 5-10

OSS Programs That Use Pthreads 5-10

Using the C++ Neutral Dialect 5-10

Undefined Behavior in C and C++ Programs 5-11

New H-Series C and C++ Features 5-11

Pragmas 5-12

Maximum Data Alignment 5-12

64-Bit Data Type and String Conversion Functions 5-12

6. Native COBOL Migration Tasks

Using the TNS/E Native COBOL Compiler 6-1

Directives Changed 6-2

Removal Optional 6-2

Possible Changes Required 6-2

RENAMES Clause Has Different Behavior 6-3

Symbol Dictionary Requires More Space 6-4

TNS/E COBOL Uses IEEE Floating-Point Format 6-5

Alignment of Level-01 and Level-77 Data Items Changed 6-5