CPP problem when header has same name as dir in previously in search path

[cholm]

>Submitter-Id:  net
>Originator:    Christian Holm Christensen
>Organization:  
>Confidential:  no
>Synopsis:      CPP problem when header has same name as dir in previously in 
>search path
>Severity:      serious
>Priority:      medium
>Category:      preprocessor
>Class:         sw-bug
>Release:       3.0.3 (Debian testing/unstable)
>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.