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- DVIPS & GNU C
-
-Changes that had to be made in order to compile the DVIPS program with the GNU
-CC (GCC) compiler on Vax/VMS.
-
-(1) DVIPS.C
-(a) Problem with 'include' files. The person who did the original port to VMS
-used the :
-#include filename
-notation rather than the more traditional
-#include "filename.h"
-notation. With the VAX C compiler this means that the chosen header file is
-extracted from the SYS$SHARE:VAXCDEF.TLB text library. Well, the GCC compiler
-doesn't understand this notation. Now, I could've simply changed it so that if
-the code was being compiled on a VMS machine then use the
-#include "filename.h"
-notation regardless of the compiler. But some sites may not have extracted the
-header files from the text library when the VAX C compiler was installed.
-This problem also affects the VMSCLI.C file on the [.VMS] directory.
-
-(b) The TFMPATH, PKPATH, etc.., definitions cannot be defined in the MAKEFILE
-because the GCC.EXE program complains with the following error message...
-% gcc-cpp command too long. Unable to compile.
-
-After removing some of the path definitions to shorten the command (just too
-see roughly how big the buffer was) I eventually tricked the GCC.EXE program
-into getting as far as executing the GNU_CC:[000000]GCC.COM command file but
-it then complained, giving the following message...
-%DCL-W-TKNOVF, command element is too long - shorten
-So, I gave up and took the easy way out, i.e. put these PATH definitions back
-in to a new GCC-specific PATHS.H, called VMS_GCC_PATHS.H
-
-(2) DOSPECIAL.C
-The "tolower" macro, defined in GNU_CC:[INCLUDE]CTYPE.H, is too simple. It
-doesn't check to see if the character is in the range 'A' to 'Z' therefore
-we may as well use the "Tolower" function supplied in the DOSPECIAL.C file.
-
-(3) The MAKEFILE has been updated to handle the GCC compiler. It must be edited
-by the user to select either the VAX11C or the GCC compiler. Search for the
-strings VAXC or GNUC and comment out the appropriate lines.
-
-(4) VMS.H
-The "getchar" macro is undefined if it already exists. This is just to stop the
-warning message from the GCC compiler informing us that it is being redefined.
-GNUC defines it in GNU_CC:[INCLUDE]STDIO.H
-
-(5) VAXVMS.C
-Defined all the functions at the top of the file to keep the GCC compiler
-quiet, since it reported the following problems...
-
-vaxvms.c;1: In function vms_ftell:
-vaxvms.c;1:223: warning: `vms_ftell' was previously implicitly declared to return `int'
-vaxvms.c;1: In function vms_ungetc:
-vaxvms.c;1:296: warning: `vms_ungetc' was previously implicitly declared to return `int'
-vaxvms.c;1: In function vms_getenv:
-
-Next, if using the GNU CC compiler then #include <stdlib.h> so that the
-compiler knows all about the `strchr' and `getenv' functions, hence avoiding
-the following warnings...
-
-vaxvms.c;1:331: warning: assignment of pointer from integer lacks a cast
-vaxvms.c;1:333: warning: assignment of pointer from integer lacks a cast
-vaxvms.c;1:336: warning: assignment of pointer from integer lacks a cast
-vaxvms.c;1:340: warning: assignment of pointer from integer lacks a cast
-
--------------------------------------------------------------------------------
-These changes were tested with GCC 1.42 which is the current official release
-of VMS GCC, available from any of the many GNU archive sites. These changes
-were also tested with GCC 2.3.3 which is avaliable from MANGO.RSMAS.MIAMI.EDU
-(pub/VMS-gcc). The problem to be aware of is that GNUC doesn't have a
-CLIMSGDEF.H header file (needed for DVIPS.C). One way out it to create one by
-hand from the output from ...
-$ LIBRARY/MACRO/EXTRACT=$CLIMSGDEF/OUTPUT=SYS$OUTPUT SYS$LIBRARY:STARLET.MLB
-The other solution is to use the more complete package of C header files
-provided by Pat Rankin, also available at MANGO.RSMAS.MIAMI.EDU