preprocessor/5940: CPP problem when header has same name as dir in previously in search path

[cholm@fys.ku.dk]

>Number:         5940
>Category:       preprocessor
>Synopsis:       CPP problem when header has same name as dir in previously in search path
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 13 10:56:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Christian Holm Christensen
>Release:        3.0.3 (Debian testing/unstable)
>Organization:
>Environment:
System: Linux scharff.fys.ku.dk 2.2.17 #2 SMP Tue Nov 14 17:20:25 CET 2000 i686 unknown
Architecture: i686

	
host: i386-pc-linux-gnu
build: i386-pc-linux-gnu
target: i386-pc-linux-gnu
configured with: ../src/configure -v --enable-languages=c,c++,java,f77,proto,objc --prefix=/usr --infodir=/share/info --mandir=/share/man --enable-shared --with-gnu-as --with-gnu-ld --with-system-zlib --enable-long-long --enable-nls --without-included-gettext --disable-checking --enable-threads=posix --enable-java-gc=boehm --with-cpp-install-dir=bin --enable-objc-gc i386-linux
>Description:
	If an `#include' directive, wether it a "..." or a <...> which matches a 
	directory name in the search path, will make CPP try to include that 
	directory, regardless of wether there's an actual file later on in the 
	search.

	This problem is present in EGCS 2.91.66, GCC 2.93.4, `GCC 2.96-RH', and 
	GCC 3.0.3. 

	It may be that I'm doing things wrong, but I do believe the interface is 
	rather  contra-intutive in that case. 

	I did not find anything in the documentation that could help me on this. 
>How-To-Repeat:
	Make the directory `stdio.h':
	
		prompt% mkdir -p stdio.h 

        Make a file (say foo.c) in the current directory, with the contenst: 

	  	#include <stdio.h>
		
		int main() { 
		  printf("Hello World\n"); 
		  return 0;
                }

	Try to compile this as 

		prompt% gcc -c -I. foo.c 

	It will fail with: 

		foo.c:1: directory `stdio.h' specified in #include
	
	I know that `stdio.h' is not  a common name for a directory, but imagine 
	something like  `new' in C++ code. 
>Fix:
	If one uses `-idirafter .' rather then `-I.', then everything works fine. 
>Release-Note:
>Audit-Trail:
>Unformatted: