Re: preprocessor/3858: fails to parse #include HASHDEFINEDMACROFORPATH"filename"

Re: preprocessor/3858: fails to parse #include HASHDEFINEDMACROFORPATH"filename"

[neil]

Synopsis: fails to parse #include HASHDEFINEDMACROFORPATH"filename"

State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Sat Jul 28 14:23:04 2001
State-Changed-Why:
    Not a bug.  String concatenation occurs in the compiler after the standard preprocessing stages. In other words, the preprocessor does not do string
    concatenation.
    
    2.95.2 doing so could be construed as a bug or an undocumented feature.
    The evolution of GCC classifies it as a bug :-)  It is certainly not portable.
    
    As for no such file or directory, here it means "no such file" of course,
    but that's Unix for you.  Like CPP claimed, it ignored your final string
    as an excess token, and tried to open the directory as a file.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3858&database=gcc

preprocessor/3858: fails to parse #include HASHDEFINEDMACROFORPATH"filename"

[vil]

>Number:         3858
>Category:       preprocessor
>Synopsis:       fails to parse #include HASHDEFINEDMACROFORPATH"filename"
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Sat Jul 28 11:06:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     vil@rccp.tsukuba.ac.jp
>Release:        3.0
>Organization:
>Environment:
powerpc-ibm-aix4.3.2.0
>Description:
The following piece of code fails to compile under g++ 
or gcc

gcc yum.C

yum.C:
#define GPROGSPATH"/home/usr/me/"
#include GPROGSPATH"emptyfile.h"
int main(void){}

where /home/usr/me is my home directory,
and /home/usr/me/emptyfile.h really is an empty file.

At compile time it gives the following error.

yum.C:2:20: warning: extra tokens at end of #include directive
yum.C:2:33: /home/usr/me/: No such file or directory

The directory really does exist, as witnessed by the fact 
that the exact same code compiles fine on the same machine with
gcc emvironment rs6000-ibm-aix4.3.2.0 version 2.95
 
>How-To-Repeat:
cat>yum.C
#define GPROGSPATH"/home/usr/me/"
#include GPROGSPATH"emptyfile.h"
int main(void){}
ctrl-D
touch emptyfile.h
gcc yum.C
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: