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Q39246: No QB Support for Mixed Languages Compiled with /FPc or /FPa

Article: Q39246
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | SR# S881129-40 B_BasicCom | mspl13_basic
Last Modified: 5-SEP-1990

QuickBASIC versions 4.00, 4.00b, and 4.50 do not support the use of
the Alternate IEEE Math Library (/FPa) or code that generates
floating-point calls (/FPc). QuickBASIC generates in-line math
coprocessor instructions and uses the emulator library. If a math
coprocessor is present, it will be used.

Mixed-language routines linked to a QuickBASIC routine must be
compiled so they generate in-line math coprocessor instructions and
use the emulator library. This is the default option for Microsoft C
version 5.10 and most other Microsoft languages.

The following is an example of compiling and LINKing a mixed-language
application:

   BC bmain.bas;
   CL /c /AM csub;
   LINK bmain + csub /noe;

Note: If the /FPa or /FPc switch was used on the CL command line, the
linker may produce "duplicate definition" errors. If you get
"duplicate definition" errors at link time, the resulting executable
file may or may not run correctly.

Microsoft BASIC Compiler versions 6.00 and 6.00b for MS-DOS and MS
OS/2 and Microsoft BASIC Professional Development System (PDS)
versions 7.00 and 7.10 each support the /FPa option for the BC.EXE
compiler. However, neither the QuickBASIC environment (QB.EXE) that
comes with the BASIC compiler nor the QuickBASIC Extended environment
(QBX.EXE) that comes with BASIC PDS support /FPa. Therefore,
mixed-language programming using alternate math (/FPa) could be
accomplished with compiled programs with these products.

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