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Re: present but cannot be compiled (Was: reporting a bug as instructed)


From: Akim Demaille
Subject: Re: present but cannot be compiled (Was: reporting a bug as instructed)
Date: Fri, 23 May 2003 09:10:27 +0200
User-agent: Gnus/5.1001 (Gnus v5.10.1) Emacs/21.3 (gnu/linux)

Thanks for the bug report!

Contrary to the message reported by ./configure, this is not a bug in
Autoconf, but the result of a recent incompatible change in Autoconf
that is likely to require the package's configure.ac to be updated.
Please, first make sure you are trying the most recent version of that
package, then, if you are, send all this message (including your
output attached) to the bug list (or the authors) of the package you
were trying to configure.

I've appended two relevant parts of the Autoconf documentation: 1. the
documentation of AC_CHECK_HEADER(S), and 2. how configure.ac should be
upgraded.

If you have some knowledge in C compilation, then there is something
more you can do to help: find out what are the prerequisite headers on
your system.

For instance, if the error message is:

       sys/socket.h: present but cannot be compiled
       sys/socket.h: check for missing prerequisite headers?
       sys/socket.h: proceeding with the preprocessor's result

then try to compile the program sample.c:

       #include <sys/socket.h>

with `cc -c sample.c'.  It will fail.  Then try to understand what
other headers are needed.  For instance, on Darwin, one needs:

       #include <stdio.h>
       #include <stdlib.h>
       #include <sys/socket.h>

to get a successful compilation.  Then, send this additional
information to the package maintainers, together with a description of
your machine.

Thanks!

----------------------------------------------------------------------

Generic Header Checks
---------------------

   These macros are used to find system header files not covered by the
"particular" test macros.  If you need to check the contents of a header
as well as find out whether it is present, you have to write your own
test for it (*note Writing Tests::).

 - Macro: AC_CHECK_HEADER (HEADER-FILE, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [INCLUDES = `default-includes'])
     If the system header file HEADER-FILE is compilable, execute shell
     commands ACTION-IF-FOUND, otherwise execute ACTION-IF-NOT-FOUND.
     If you just want to define a symbol if the header file is
     available, consider using `AC_CHECK_HEADERS' instead.

     For compatibility issues with older versions of Autoconf, please
     read below.

 - Macro: AC_CHECK_HEADERS (HEADER-FILE..., [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [INCLUDES = `default-includes'])
     For each given system header file HEADER-FILE in the
     whitespace-separated argument list that exists, define
     `HAVE_HEADER-FILE' (in all capitals).  If ACTION-IF-FOUND is
     given, it is additional shell code to execute when one of the
     header files is found.  You can give it a value of `break' to
     break out of the loop on the first match.  If ACTION-IF-NOT-FOUND
     is given, it is executed when one of the header files is not found.

     For compatibility issues with older versions of Autoconf, please
     read below.

   Previous versions of Autoconf merely checked whether the header was
accepted by the preprocessor.  This was changed because the old test was
inappropriate for typical uses.  Headers are typically used to compile,
not merely to preprocess, and the old behavior sometimes accepted
headers that clashed at compile-time.  If you need to check whether a
header is preprocessable, you can use `AC_PREPROC_IFELSE' (*note
Running the Preprocessor::).

   This scheme, which improves the robustness of the test, also requires
that you make sure that headers that must be included before the
HEADER-FILE be part of the INCLUDES, (*note Default Includes::).  If
looking for `bar.h', which requires that `foo.h' be included before if
it exists, we suggest the following scheme:


AC_CHECK_HEADERS([foo.h])
AC_CHECK_HEADERS([bar.h], [], [],
[#if HAVE_FOO_H
# include <foo.h>
# endif
])

----------------------------------------------------------------------

Header Present But Cannot Be Compiled
=====================================

   The most important guideline to bear in mind when checking for
features is to mimic as much as possible the intended use.
Unfortunately, old versions of `AC_CHECK_HEADER' and `AC_CHECK_HEADERS'
failed to follow this idea, and called the preprocessor, instead of the
compiler, to check for headers.  As a result, incompatibilities between
headers went unnoticed during configuration, and maintainers finally
had to deal with this issue elsewhere.

   As of Autoconf 2.56 both checks are performed, and `configure'
complains loudly if the compiler and the preprocessor do not agree.
For the time being the result used is that of the preprocessor, to give
maintainers time to adjust their `configure.ac', but in the near
future, only the compiler will be considered.

   Consider the following example:

     $ cat number.h
     typedef int number;
     $ cat pi.h
     const number pi = 3;
     $ cat configure.ac
     AC_INIT
     AC_CHECK_HEADERS(pi.h)
     $ autoconf -Wall
     $ ./configure
     checking for gcc... gcc
     checking for C compiler default output... a.out
     checking whether the C compiler works... yes
     checking whether we are cross compiling... no
     checking for suffix of executables...
     checking for suffix of object files... o
     checking whether we are using the GNU C compiler... yes
     checking whether gcc accepts -g... yes
     checking for gcc option to accept ANSI C... none needed
     checking how to run the C preprocessor... gcc -E
     checking for egrep... grep -E
     checking for ANSI C header files... yes
     checking for sys/types.h... yes
     checking for sys/stat.h... yes
     checking for stdlib.h... yes
     checking for string.h... yes
     checking for memory.h... yes
     checking for strings.h... yes
     checking for inttypes.h... yes
     checking for stdint.h... yes
     checking for unistd.h... yes
     checking pi.h usability... no
     checking pi.h presence... yes
     configure: WARNING: pi.h: present but cannot be compiled
     configure: WARNING: pi.h: check for missing prerequisite headers?
     configure: WARNING: pi.h: proceeding with the preprocessor's result
     configure: WARNING:     ## ------------------------------------ ##
     configure: WARNING:     ## Report this to address@hidden ##
     configure: WARNING:     ## ------------------------------------ ##
     checking for pi.h... yes

The proper way the handle this case is using the fourth argument (*note
Generic Headers::):

     $ cat configure.ac
     AC_INIT
     AC_CHECK_HEADERS(number.h pi.h,,,
     [[#if HAVE_NUMBER_H
     # include <number.h>
     #endif
     ]])
     $ autoconf -Wall
     $ ./configure
     checking for gcc... gcc
     checking for C compiler default output... a.out
     checking whether the C compiler works... yes
     checking whether we are cross compiling... no
     checking for suffix of executables...
     checking for suffix of object files... o
     checking whether we are using the GNU C compiler... yes
     checking whether gcc accepts -g... yes
     checking for gcc option to accept ANSI C... none needed
     checking for number.h... yes
     checking for pi.h... yes

   See *Note Particular Headers::, for a list of headers with their
prerequisite.

----------------------------------------------------------------------

Portability of Headers
----------------------

This section tries to collect knowledge about common headers, and the
problems they cause.  By definition, this list will always require
additions.  Please help us keeping it as complete as possible.

`inttypes.h' vs. `stdint.h'
     Paul Eggert notes that: ISO C 1999 says that `inttypes.h' includes
     `stdint.h', so there's no need to include `stdint.h' separately in
     a standard environment.  Many implementations have `inttypes.h'
     but not `stdint.h' (e.g., Solaris 7), but I don't know of any
     implementation that has `stdint.h' but not `inttypes.h'.  Nor do I
     know of any free software that includes `stdint.h'; `stdint.h'
     seems to be a creation of the committee.

`linux/irda.h'
     It requires `linux/types.h' and `sys/socket.h'.

`net/if.h'
     On Darwin, this file requires that `sys/socket.h' be included
     beforehand.  One should run:

          AC_CHECK_HEADERS([sys/socket.h])
          AC_CHECK_HEADERS([net/if.h], [], [],
          [#include <stdio.h>
          #if STDC_HEADERS
          # include <stdlib.h>
          # include <stddef.h>
          #else
          # if HAVE_STDLIB_H
          #  include <stdlib.h>
          # endif
          #endif
          #if HAVE_SYS_SOCKET_H
          # include <sys/socket.h>
          #endif
          ])

`stdint.h'
     See above, item `inttypes.h' vs. `stdint.h'.

`stdlib.h'
     On many systems (e.g., Darwin), `stdio.h' is a prerequisite.

`sys/socket.h'
     On Darwin, `stdlib.h' is a prerequisite.

`X11/extensions/scrnsaver.h'
     Using XFree86, this header requires `X11/Xlib.h', which is probably
     so required that you might not even consider looking for it.

          AC_CHECK_HEADERS([X11/extensions/scrnsaver.h], [], [],
          [[#include <X11/Xlib.h>
          ]])

----------------------------------------------------------------------
Link: File-List
SEE OUTPUT BELOW. Theres 2 of them.

 

 

 

ing sys/sockio.h presence... yes

checking for sys/sockio.h... yes

checking netinet/if_ether.h usability... no

checking netinet/if_ether.h presence... yes

configure: WARNING: netinet/if_ether.h: present but cannot be compiled

configure: WARNING: netinet/if_ether.h: check for missing prerequisite
headers?

configure: WARNING: netinet/if_ether.h: proceeding with the preprocessor's
result

configure: WARNING:     ## ------------------------------------ ##

configure: WARNING:     ## Report this to address@hidden ##

configure: WARNING:     ## ------------------------------------ ##

checking for netinet/if_ether.h... yes

checking bstring.h usability... no

checking bstring.h presence... no

checking for bstring.h... no

checking sys/time.h usability... yes

checking sys/time.h presence... yes

checking for sys/time.h... yes

checking pwd.h usability... yes

checking pwd.h presence... yes

checking for pwd.h... yes

checking for unistd.h... (cached) yes

checking whether time.h and sys/time.h may both be included... yes

checking for inline... inline

checking struct ip... yes

checking ip_v in struct ip... yes

checking if sockaddr{} has sa_len member... yes

checking whether byte ordering is bigendian... no

checking if struct in_addr is a wacky huge structure (some Sun boxes)...
no

checking if struct icmp exists... yes

checking if struct ip exists... yes

checking if struct ip has ip_sum member... yes

checking for bzero... yes

checking for snprintf... yes

checking for vsnprintf... yes

checking for memcpy... yes

checking for usleep... yes

checking for nanosleep... (cached) yes

checking for strerror... yes

checking for strcasestr... no

checking for inet_aton... yes

checking for getopt_long_only... yes

checking for gtk-config... no

checking If you have GTK+ installed... no

configure: WARNING: Gtk+ has not been installed -> nmapfe will not be made

configure: creating ./config.status

config.status: creating Makefile

config.status: creating config.h

configure: configuring in nbase

configure: running /bin/sh './configure' --prefix=/usr/local 
--cache-file=/dev/null --srcdir=.

checking for gcc... gcc

checking for C compiler default output... a.out

checking whether the C compiler works... yes

checking whether we are cross compiling... no

checking for suffix of executables...

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ANSI C... none needed

checking for ranlib... ranlib

checking build system type... i386-unknown-openbsd3.2

checking host system type... i386-unknown-openbsd3.2

checking how to run the C preprocessor... gcc -E

checking for egrep... grep -E

checking for ANSI C header files... yes

checking for sys/types.h... yes

checking for sys/stat.h... yes

checking for stdlib.h... yes

checking for string.h... yes

checking for memory.h... yes

checking for strings.h... yes

checking for inttypes.h... yes

checking for stdint.h... no

checking for unistd.h... yes

checking for string.h... (cached) yes

checking getopt.h usability... yes

checking getopt.h presence... yes

checking for getopt.h... yes

checking for strings.h... (cached) yes

checking for memory.h... (cached) yes

checking sys/param.h usability... yes

checking sys/param.h presence... yes

checking for sys/param.h... yes

checking sys/time.h usability... yes

checking sys/time.h presence... yes

checking for sys/time.h... yes

checking for unistd.h... (cached) yes

checking bstring.h usability... no

checking bstring.h presence... no

checking for bstring.h... no

checking errno.h usability... yes

checking errno.h presence... yes

checking for errno.h... yes

checking for sys/types.h... (cached) yes

checking for sys/time.h... (cached) yes

checking sys/socket.h usability... yes

checking sys/socket.h presence... yes

checking for sys/socket.h... yes

checking netinet/in.h usability... yes

checking netinet/in.h presence... yes

checking for netinet/in.h... yes

checking netinet/if_ether.h usability... no

checking netinet/if_ether.h presence... yes

configure: WARNING: netinet/if_ether.h: present but cannot be compiled

configure: WARNING: netinet/if_ether.h: check for missing prerequisite
headers?

configure: WARNING: netinet/if_ether.h: proceeding with the preprocessor's
result

configure: WARNING:     ## ------------------------------------ ##

configure: WARNING:     ## Report this to address@hidden ##

configure: WARNING:     ## ------------------------------------ ##

checking for netinet/if_ether.h... yes

checking sys/sockio.h usability... yes

checking sys/sockio.h presence... yes

checking for sys/sockio.h... yes

checking rpc/types.h usability... yes

checking rpc/types.h presence... yes

checking for rpc/types.h... yes

checking netdb.h usability... yes

checking netdb.h presence... yes

checking for netdb.h... yes

checking pwd.h usability... yes

checking pwd.h presence... yes

checking for pwd.h... yes

checking arpa/inet.h usability... yes

checking arpa/inet.h presence... yes

checking for arpa/inet.h... yes

checking sys/resource.h usability... yes

checking sys/resource.h presence... yes

checking for sys/resource.h... yes

checking for sys/stat.h... (cached) yes

checking sys/wait.h usability... yes

checking sys/wait.h presence... yes

checking for sys/wait.h... yes

checking libiberty.h usability... no

checking libiberty.h presence... no

checking for libiberty.h... no

checking whether time.h and sys/time.h may both be included... yes

checking for inline... inline

checking for __attribute__... yes

checking whether byte ordering is bigendian... no

checking for gethostent... yes

checking for setsockopt... yes

checking for char... yes

checking size of char... 1

checking for short... yes

checking size of short... 2

checking for int... yes

checking size of int... 4

checking for long... yes

checking size of long... 4

checking for bzero... yes

checking for snprintf... yes

checking for vsnprintf... yes

checking for memcpy... yes

checking for nanosleep... yes

checking for strerror... yes

checking for strcasestr... no

checking for strcasecmp... yes

checking for strncasecmp... yes

checking for signal... yes

checking for inet_aton... yes

checking for vsnprintf... (cached) yes

checking for snprintf... (cached) yes

checking for asprintf... yes

checking for asnprintf... no

checking for vasprintf... yes

checking for vasnprintf... no

checking for usleep... yes

checking for gettimeofday... yes

checking for sleep... yes

checking for getopt_long_only... yes

checking for strcasecmp... (cached) yes

checking for strncasecmp... (cached) yes

checking for library containing getaddrinfo... none required

checking for library containing gai_strerror... none required

checking for library containing getnameinfo... none required

checking for gai_strerror... yes

checking for inet_ntop... yes

checking for inet_pton... yes

checking for working getaddrinfo... yes

checking for working getnameinfo... yes

checking for sockaddr_in6... yes

checking for sockaddr_storage... yes

checking for AF_INET6 definition... yes

checking for IPv6 support... yes

configure: creating ./config.status

config.status: creating Makefile

config.status: creating nbase_config.h

configure: configuring in nbase

configure: running /bin/sh './configure' --prefix=/usr/local 
--cache-file=/dev/null --srcdir=.

checking for gcc... gcc

checking for C compiler default output... a.out

checking whether the C compiler works... yes

checking whether we are cross compiling... no

checking for suffix of executables...

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ANSI C... none needed

checking for ranlib... ranlib

checking build system type... i386-unknown-openbsd3.2

checking host system type... i386-unknown-openbsd3.2

checking how to run the C preprocessor... gcc -E

checking for egrep... grep -E

checking for ANSI C header files... yes

checking for sys/types.h... yes

checking for sys/stat.h... yes

checking for stdlib.h... yes

checking for string.h... yes

checking for memory.h... yes

checking for strings.h... yes

checking for inttypes.h... yes

checking for stdint.h... no

checking for unistd.h... yes

checking for string.h... (cached) yes

checking getopt.h usability... yes

checking getopt.h presence... yes

checking for getopt.h... yes

checking for strings.h... (cached) yes

checking for memory.h... (cached) yes

checking sys/param.h usability... yes

checking sys/param.h presence... yes

checking for sys/param.h... yes

checking sys/time.h usability... yes

checking sys/time.h presence... yes

checking for sys/time.h... yes

checking for unistd.h... (cached) yes

checking bstring.h usability... no

checking bstring.h presence... no

checking for bstring.h... no

checking errno.h usability... yes

checking errno.h presence... yes

checking for errno.h... yes

checking for sys/types.h... (cached) yes

checking for sys/time.h... (cached) yes

checking sys/socket.h usability... yes

checking sys/socket.h presence... yes

checking for sys/socket.h... yes

checking netinet/in.h usability... yes

checking netinet/in.h presence... yes

checking for netinet/in.h... yes

checking netinet/if_ether.h usability... no

checking netinet/if_ether.h presence... yes

configure: WARNING: netinet/if_ether.h: present but cannot be compiled

configure: WARNING: netinet/if_ether.h: check for missing prerequisite
headers?

configure: WARNING: netinet/if_ether.h: proceeding with the preprocessor's
result

configure: WARNING:     ## ------------------------------------ ##

configure: WARNING:     ## Report this to address@hidden ##

configure: WARNING:     ## ------------------------------------ ##

 

  Eric W. Johnson CCNA

  Network Administrator, Sr.

  Bend  Data  Center

  Office 541.322.6890 ext. 101

"I have not failed 10,000 times, I have successfully found 10,000 ways
that won't work." -- Thomas A. Edison

 




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