Include strangeness

[Piers O'Hanlon <P dot OHanlon at cs dot ucl dot ac dot uk>]

Hi,

I've been working on vic - the video conference tool from LBL. It has compiled 
with gcc version up to and including egcs.1.1.2 on Solaris 2.7.

I have now installed gcc-2.95.2 and have run into problems with files that 
#include <X11/Xlib.h>. When this test program(below) is compiled without the 
sun specific include path it works (output below). I then took the standard 
include path(below) and added them after a -nostdinc as -I <include paths> and 
the compile(cpp) fails. This is the same as when I have only  
-I/usr/openwin/include on the compile line (see below). It seems that gcc is 
including the header files in a different way when using 'standard include 
paths' - possibly using fixed headers (though I cannot find any in the 
gcc-2.95.2 directories - or the ones list as the the 'standard' include 
paths.).

The setup here is that /usr/include/X11 is a soft link to 
/usr/openwin/include/X11 - so it would seem from the output from '-E' that 
there was no difference between the included file locations when compiling 
with and without the -I/usr/openwin/include?

The inclusion of -I/usr/openwin/include has become quite standard for Sun 
based X11 applications so may be causing a number of people some problems.

Any suggestions would be welcomed as why this is happening - or the best 
approach to tackle it.

Thanks,

Piers O'Hanlon
--------------________________________________________________________
Computer Science Department	Phone: +44 (0) 20 7679 3670
University College London	Fax:   +44 (0) 20 7387 1397
Gower Street			Email: P.OHanlon@cs.ucl.ac.uk
London WC1E 6BT			WWW:   http://www.cs.ucl.ac.uk/staff/piers

test.cpp:
-----------------------------
#include <X11/Xlib.h>
int
main(int argc, const char** argv)
{
        return (0);
}
------------------------------

scary[96]unix % gcc -v test.cpp
Reading specs from /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-
sun-solaris2.7/2.95.2/specs
gcc version 2.95.2 19991024 (release)
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/cpp -lang-c++ -v -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 
-D__cplusplus -Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 -D__sparc__ -D__sun__ 
-D__unix__ -D__svr4__ -D__SVR4 -D__sparc -D__sun -D__unix -Asystem(unix) 
-Asystem(svr4) -D__EXCEPTIONS -D__GCC_NEW_VARARGS__ -Acpu(sparc) 
-Amachine(sparc) test.cpp /var/tmp/cc2Fu7UC.ii
GNU CPP version 2.95.2 19991024 (release) (sparc)
#include "..." search starts here:
#include <...> search starts here:
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../include/g++-3
 /usr/local/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../sparc-sun-solaris2.7/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
End of omitted list.
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/cc1plus /var/tmp/cc2Fu7UC.ii -quiet -dumpbase test.cc -version -o 
/var/tmp/cco1X9Ya.s
GNU C++ version 2.95.2 19991024 (release) (sparc-sun-solaris2.7) compiled by 
GNU C version 2.95.2 19991024 (release).
 /usr/ccs/bin/as -V -Qy -s -o /var/tmp/ccgrVCv3.o /var/tmp/cco1X9Ya.s
/usr/ccs/bin/as: WorkShop Compilers 5.0 98/12/21
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/collect2 -V -Y P,/usr/ccs/lib:/usr/lib -Qy /cs/research/mice/starship/commo
n/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.95.2/crt1.o 
/cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.95
.2/crti.o /usr/ccs/lib/values-Xa.o /cs/research/mice/starship/common/solaris/li
b/gcc-lib/sparc-sun-solaris2.7/2.95.2/crtbegin.o -L/cs/research/mice/starship/c
ommon/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.95.2 
-L/cs/research/mice/starship/common/solaris/sparc-sun-solaris2.7/lib 
-L/usr/ccs/bin -L/usr/ccs/lib -L/cs/research/mice/starship/common/solaris/lib 
/var/tmp/ccgrVCv3.o -lgcc -lc -lgcc /cs/research/mice/starship/common/solaris/l
ib/gcc-lib/sparc-sun-solaris2.7/2.95.2/crtend.o /cs/research/mice/starship/comm
on/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.95.2/crtn.o
ld: Software Generation Utilities - Solaris/ELF (3.0)


+++++++++++++++++++++++++++++++++
scary[98]unix % gcc -v -nostdinc test.cpp -I/cs/research/mice/starship/common/s
olaris/lib/gcc-lib/sparc-sun-solaris2.7/2.95.2/../../../../include/g++-3 
-I/usr/local/include -I/cs/research/mice/starship/common/solaris/lib/gcc-lib/sp
arc-sun-solaris2.7/2.95.2/../../../../sparc-sun-solaris2.7/include 
-I/cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.
95.2/include -I/usr/include
Reading specs from /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-
sun-solaris2.7/2.95.2/specs
gcc version 2.95.2 19991024 (release)
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/cpp -lang-c++ -nostdinc -v -I/cs/research/mice/starship/common/solaris/lib/
gcc-lib/sparc-sun-solaris2.7/2.95.2/../../../../include/g++-3 
-I/usr/local/include -I/cs/research/mice/starship/common/solaris/lib/gcc-lib/sp
arc-sun-solaris2.7/2.95.2/../../../../sparc-sun-solaris2.7/include 
-I/cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.
95.2/include -I/usr/include -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 
-D__cplusplus -Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 -D__sparc__ -D__sun__ 
-D__unix__ -D__svr4__ -D__SVR4 -D__sparc -D__sun -D__unix -Asystem(unix) 
-Asystem(svr4) -D__EXCEPTIONS -D__GCC_NEW_VARARGS__ -Acpu(sparc) 
-Amachine(sparc) test.cpp /var/tmp/ccmF6W4Q.ii
GNU CPP version 2.95.2 19991024 (release) (sparc)
#include "..." search starts here:
#include <...> search starts here:
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../include/g++-3
 /usr/local/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../sparc-sun-solaris2.7/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../include/g++-3
 /usr/local/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../sparc-sun-solaris2.7/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/include
 /usr/include
End of omitted list.
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/cc1plus /var/tmp/ccmF6W4Q.ii -quiet -dumpbase test.cc -version -o 
/var/tmp/cca87jSE.s
GNU C++ version 2.95.2 19991024 (release) (sparc-sun-solaris2.7) compiled by 
GNU C version 2.95.2 19991024 (release).
In file included from test.cpp:1:
/usr/include/X11/Xlib.h:2063: ANSI C++ forbids declaration 
`XSetTransientForHint' with no type
/usr/include/X11/Xlib.h:2071: ANSI C++ forbids declaration 
`XActivateScreenSaver' with no type
/usr/include/X11/Xlib.h:2078: ANSI C++ forbids declaration `XAddHost' with no 
type
/usr/include/X11/Xlib.h:2086: ANSI C++ forbids declaration `XAddHosts' with no 
type
/usr/include/X11/Xlib.h:2093: ANSI C++ forbids declaration 
`XAddToExtensionList' with no type
/usr/include/X11/Xlib.h:2100: ANSI C++ forbids declaration `XAddToSaveSet' 
with no type
/usr/include/X11/Xlib.h:2154: ANSI C++ forbids declaration `XAllowEvents' with 
no type
/usr/include/X11/Xlib.h:2160: ANSI C++ forbids declaration `XAutoRepeatOff' 
with no type
....
stuff deleted
.....
/usr/include/X11/Xlib.h:4141: ANSI C++ forbids declaration `XWarpPointer' with 
no type
/usr/include/X11/Xlib.h:4162: ANSI C++ forbids declaration `XWindowEvent' with 
no type

====================================
scary[99]unix % gcc -v test.cpp -I/usr/openwin/include                         
 Reading specs from /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc
-sun-solaris2.7/2.95.2/specs
gcc version 2.95.2 19991024 (release)
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/cpp -lang-c++ -v -I/usr/openwin/include -D__GNUC__=2 -D__GNUG__=2 
-D__GNUC_MINOR__=95 -D__cplusplus -Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 
-D__sparc__ -D__sun__ -D__unix__ -D__svr4__ -D__SVR4 -D__sparc -D__sun 
-D__unix -Asystem(unix) -Asystem(svr4) -D__EXCEPTIONS -D__GCC_NEW_VARARGS__ 
-Acpu(sparc) -Amachine(sparc) test.cpp /var/tmp/ccCVvd2a.ii
GNU CPP version 2.95.2 19991024 (release) (sparc)
#include "..." search starts here:
#include <...> search starts here:
 /usr/openwin/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../include/g++-3
 /usr/local/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/../../../../sparc-sun-solaris2.7/include
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
End of omitted list.
 /cs/research/mice/starship/common/solaris/lib/gcc-lib/sparc-sun-solaris2.7/2.9
5.2/cc1plus /var/tmp/ccCVvd2a.ii -quiet -dumpbase test.cc -version -o 
/var/tmp/ccWiPg2g.s
GNU C++ version 2.95.2 19991024 (release) (sparc-sun-solaris2.7) compiled by 
GNU C version 2.95.2 19991024 (release).
In file included from test.cpp:1:
/usr/openwin/include/X11/Xlib.h:2063: ANSI C++ forbids declaration 
`XSetTransientForHint' with no type
/usr/openwin/include/X11/Xlib.h:2071: ANSI C++ forbids declaration 
`XActivateScreenSaver' with no type
/usr/openwin/include/X11/Xlib.h:2078: ANSI C++ forbids declaration `XAddHost' 
with no type
/usr/openwin/include/X11/Xlib.h:2086: ANSI C++ forbids declaration `XAddHosts' 
with no type
/usr/openwin/include/X11/Xlib.h:2093: ANSI C++ forbids declaration 
`XAddToExtensionList' with no type
/usr/openwin/include/X11/Xlib.h:2100: ANSI C++ forbids declaration 
`XAddToSaveSet' with no type
/usr/openwin/include/X11/Xlib.h:2154: ANSI C++ forbids declaration 
`XAllowEvents' with no type
/usr/openwin/include/X11/Xlib.h:2160: ANSI C++ forbids declaration 
`XAutoRepeatOff' with no type
/usr/openwin/include/X11/Xlib.h:2166: ANSI C++ forbids declaration 
`XAutoRepeatOn' with no type
/usr/openwin/include/X11/Xlib.h:2173: ANSI C++ forbids declaration `XBell' 
with no type
/usr/openwin/include/X11/Xlib.h:2206: ANSI C++ forbids declaration 
`XChangeActivePointerGrab' with no type
....
stuff deleted
.....
/usr/include/X11/Xlib.h:4141: ANSI C++ forbids declaration `XWarpPointer' with 
no type
/usr/include/X11/Xlib.h:4162: ANSI C++ forbids declaration `XWindowEvent' with 
no type