AC_PROG_CPP test fails

[Akim Demaille]

Hi Pavel,

I have the test 28 that fails since this week on my machine.  I tend
to think that it is my machine that has a problem, here are the logs.

src/ace/tests % ./testsuite 28 -d -v                           nostromo Err 130
=========================================
Testing suite for autoconf, version 2.49c
=========================================
testing AC_PROG_CPP without warnings
     28. ./compile.at:77...
./compile.at:95: autoconf --autoconf-dir .. -l $at_srcdir
./compile.at:95: autoheader --autoconf-dir .. -l $at_srcdir
./compile.at:95: top_srcdir=$top_srcdir ./configure
--- empty       Fri Dec 15 13:00:04 2000
+++ stderr      Fri Dec 15 13:00:08 2000
@@ -0,0 +1 @@
+configure: error: C preprocessor "./mycpp" fails sanity check
checking for gcc... gcc
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking whether we are using the GNU C compiler... yes
checking for object suffix... o
checking for executable suffix... 
checking whether gcc accepts -g... yes
checking how to run the C preprocessor... ./mycpp
Exit code was 1, expected 0
     28. ./compile.at:77: FAILED near `compile.at:95'

=========================================
Testing suite for autoconf, version 2.49c
=========================================
src/ace/tests % cat config.log                                   nostromo 13:00
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by configure 2.49c, executed with
 > ./configure 

## ---------- ##
## Platform.  ##
## ---------- ##

hostname = nostromo
uname -m = i686
uname -r = 2.2.17
uname -s = Linux
uname -v = #1 Sat Sep 9 12:42:22 EST 2000

/usr/bin/uname -p = 
/bin/uname -X     = 

/bin/arch              = i686
/usr/bin/arch -k       = 
/usr/convex/getsysinfo = 
hostinfo               = 
/bin/machine           = 
/usr/bin/oslevel       = 
/bin/universe          = 

PATH = 
/home/lrde/prof/akim/src/ace/tests:/home/lrde/prof/akim/src/ace:/home/lrde/prof/akim/bin:/home/lrde/prof/akim/bin:/home/lrde/prof/akim/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/X11R6/bin:/usr/local/kde/bin

## ------------ ##
## Core tests.  ##
## ------------ ##

configure:939: checking for gcc
configure:961: result: gcc
configure:1183: checking whether the C compiler works
configure:1198: gcc -o conftest    conftest.c  >&5
configure:1201: $? = 0
configure:1202: test -s conftest
configure:1205: $? = 0
configure:1209: ./conftest
configure:1212: $? = 0
configure:1226: result: yes
configure:1239: checking whether we are cross compiling
configure:1241: result: no
configure:1244: checking whether we are using the GNU C compiler
configure:1265: gcc -c   conftest.c >&5
configure:1268: $? = 0
configure:1280: result: yes
configure:1283: checking for object suffix
configure:1301: gcc -c   conftest.c >&5
configure:1304: $? = 0
configure:1323: result: o
configure:1327: checking for executable suffix
configure:1345: gcc -o conftest    conftest.c  >&5
configure:1348: $? = 0
configure:1349: test -s conftest
configure:1352: $? = 0
configure:1375: result: 
configure:1382: checking whether gcc accepts -g
configure:1400: gcc -c -g  conftest.c >&5
configure:1403: $? = 0
configure:1413: result: yes
configure:1431: checking how to run the C preprocessor
configure:1531: ./mycpp  conftest.c >/dev/null 2>conftest.err
configure:1534: $? = 0
In file included from /usr/include/features.h:283,
                 from /usr/include/assert.h:35,
                 from configure:1527:
/usr/include/sys/cdefs.h:104: warning: garbage at end of `#ifdef' argument
configure: failed program was:
#line 1526 "configure"
#include "confdefs.h"
#include <assert.h>
Syntax error
configure:1589: result: ./mycpp
configure:1592: error: C preprocessor "./mycpp" fails sanity check
configure: exit 1



Note that my /lib/cpp does issue a warning on assert.h.  

src/ace/tests % /lib/cpp /usr/include/sys/cdefs.h >/dev/null     nostromo 13:00
/usr/include/sys/cdefs.h:104: warning: garbage at end of `#ifdef' argument

The guilty line is:

      /* Support for flexible arrays.  */
      #if __GNUC_PREREQ (2,97)
      /* GCC 2.97 supports C99 flexible array members.  */
      # define __flexarr        []
      #else 
      # ifdef __GNUC__
      #  define __flexarr       [0]
      # else
----> #  ifdef __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
      #   define __flexarr      []
      #  else
      /* Some other non-C99 compiler.  Approximate with [1].  */
      #   define __flexarr      [1]
      #  endif
      # endif
      #endif

I don't understand it.

src/ace/tests % /lib/cpp -v                                      nostromo Err 1
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.2/specs
gcc version 2.95.2 20000220 (Debian GNU/Linux)
 /usr/lib/gcc-lib/i386-linux/2.95.2/cpp -lang-c -v -D__ELF__ -Dunix -D__i386__ 
-Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux 
-Asystem(posix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -
GNU CPP version 2.95.2 20000220 (Debian GNU/Linux) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc-lib/i386-linux/2.95.2/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/lib/gcc-lib/i386-linux/2.95.2/../../../../include/g++-3
 /usr/lib/gcc-lib/i386-linux/2.95.2/../../../../i386-linux/include
End of omitted list.