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Dignus, Systems/C, Systems/C++ and Systems/ASM are registered trademarks of Dignus, LLC. iii iv Contents How To Use This Book 1 Systems/C Overview 3 Implementation Definitions 5 Implementation limits ............................. 5 EBCDIC character set ............................. 5 Basic Data Types and Alignments ...................... 6 Return values .................................. 7 Compiling, Linking and Running Programs 9 Running the compiler, DCC .......................... 9 In OS/390 or z/OS ............................ 9 In Windows ................................ 10 In the UNIX environment ........................ 10 Include File Processing ............................. 11 In OS/390 and z/OS ........................... 11 In UNIX and Windows .......................... 12 Header filename mapping ($$HDRMAP) ................ 12 Description of options ............................. 15 Detailed description of the options ...................... 22 The –D option (define a macro) ..................... 22 The –I option (Specify additional locations to look for included files) 22 The –iquote dir option (Add dir to the list of directories to examine for local include files) ...................... 23 The –isystem dir option (Add dir to the list of system include direc- tories) ............................... 23 The –idirafter dir option (Add dir to the list of directories to search after the system include directories) .............. 23 The –Sdir option (Add dir to the list of directories to examine for include files, honoring IBM’s SEARCH semantics) ........ 23 The –nodiginc option (Disable “System Include” processing) .... 24 The –ofile option (Specify the name of the generated output file) .. 24 The –E option (preprocess only) .................... 24 The –femitdefs option (include #define values in preprocessor output) 25 The –M[=filename] option (generate a source dependence list) .... 25 Systems/C v The –MT target] option (specify the target for the dependence list) . 25 The –MF filename option (specify the name of the file for dependence list) ................................ 25 The –fdep[=filename] option (generate a source dependence list dur- ing regular compilation) ..................... 26 The –g option (debuggable code) .................... 26 The –g0 option (Disable debuggable code and debugging information) 26 The –gdwarf option (generate DWARF debugging information) ... 26 The –gstabs option (generate STABS debugging information) .... 27 The –gisd option (generate ISD debugging information) ....... 27 The –fansi bitfield packing option (ANSI rules for bitfield allocation) 27 The –nonint bitfield option (Allow any integral in bitfield declaration 28 The –fanonstruct option (Allow Microsoft’s anonymous structure ex- tension) .............................. 28 The –fc370=version option (Specify IBM C compatibility) ...... 28 The –fxplink option (Use eXtra Performance Linkage) ........ 29 The –fdll option (In IBM compatibility mode, compile for DLL support) 29 The –fexportall option (In IBM compatibility mode, export all defined data and functions ) ....................... 29 The –fcxx comments and –fno cxx comments options (Enable and disable recognition of C++-style // comments) ........ 30 The –fep=name option (Specify entry point) ............. 30 The –fprol=macro option (Specify alternate prologue macro) .... 30 The –fgnu89 inline and –fno gnu89 inline options (Control use of legacy gcc inlining rules) ........................ 32 The –finline[=x[:y:z]] and –fnoinline options (Control inlining opti- mization) ............................. 33 The –O[n] option (Set optimization level) ............... 34 The –fprv=macro option (Specify alternate PRV address macro) .. 34 The –fepil=macro option (Specify alternate epilogue macro) ..... 34 The –lnameaddr and –fnolnameaddr macros (Enable or disable gen- eration of Logical Name Address info) ............. 35 The –fopts[=macro] option (Request interesting options noted at top of generated assembly) ...................... 35 The –fendmacro[=text] option (Specify text to appear before the END statement) ............................ 35 The –frsa[=size] option (Specify the amount of space the compiler reserves for the Register Save Area) .............. 36 The –fhlasm option (Generated assembly source is to be assembled with HLASM instead of DASM) ................ 36 The –finstrument functions option (Request function beginning/ending instrumentation) ......................... 36 The –fframe base=N option (Specify register to use for addressing automatic