Xref: utzoo comp.sys.ibm.pc:30731 alt.msdos.programmer:169 comp.lang.c:19639
Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!usc!cs.utexas.edu!execu!sequoia!cb
From: cb@sequoia.UUCP (Christopher D. Brown)
Newsgroups: comp.sys.ibm.pc,alt.msdos.programmer,comp.lang.c
Subject: MS C 5.1 bug: global variable definition
Summary: Global variable not PUBLIC
Keywords: MSC 5.1, MS C
Message-ID: <576@sequoia.UUCP>
Date: 28 Jun 89 14:36:14 GMT
Reply-To: cb@sequoia.UUCP ()
Distribution: usa
Organization: Execucom Systems Corp., Austin, Texas
Lines: 21

Use the Microsoft C 5.1 command line
   CL /AL /Gt0 /Fa /c
to generate assembly and object code for both BUG.C and NOBUG.C.
Note that only NOBUG produces the public symbol _a_var.

Source file BUG.C is as follows:
   int near a_var;
Generated file BUG.ASM includes the following code:
   _BSS   SEGMENT
   COMM NEAR _a_var: BYTE: 2
   _BSS   ENDS

Source file NOBUG.C is as follows:
   int near a_var = 0;
Generated file NOBUG.ASM includes the following (correct) code:
   PUBLIC _a_var
   _DATA  SEGMENT
   _a_var DW      00H
   _DATA  ENDS

Christopher D. Brown