Re: [glade--]stdio.h error during compilation

[Peter Wainwright <prw wainpr demon co uk>]

On Fri, 2002-11-01 at 02:28, Mark Jones wrote: 
> Christof,
> 
> Do you know what might be the problem here:
I know... This looks like exactly the problem I had. It's an obscure 
autoconf problem which I probably can't explain adequately, but here 
goes: 

This is a problem I had with the configure code which tries to 
get utsname by #defining _GNU_SOURCE or __USE_GNU. 
(I'm using Red Hat 7.2 with updates). 

g++ -DHAVE_CONFIG_H -I. -I. -I.. -ISourceWriter -Iwriters -I.    -g -O2 
-c -o glade--.o `test -f 'glade--.cc' || echo './'`glade--.cc 
In file included from /usr/include/g++-3/cstdio:6, 
                 from glade--.cc:28: 
/usr/include/stdio.h:241: type specifier omitted for parameter 
/usr/include/stdio.h:241: parse error before `)' 
make[3]: *** [glade--.o] Error 1 

The problem is that when configure runs the tests, 
confdefs.h contains #include <stdlib.h>, and 
this is included BEFORE any #define lines in the test program 
conftest.cc. As a result, <stdlib.h> and the files it #includes 
will not be #included again, so the macro set in conftest.cc may 
not take effect. Thus, _GNU_SOURCE is supposed to give utsname, 
but the test does not detect this. You need to #define it before 
#including any headers... Actually __USE_GNU is supposed to be 
set automatically when you define _GNU_SOURCE, #defining it 
directly is unsupported and evil. 

Sometimes autoconf drives me mad... 

I attach a workaround. 

> 
> 
> g++ -DHAVE_CONFIG_H -I. -I. -I.. -ISourceWriter -Iwriters -I.    -g -O2
> -c glade--.cc
> In file included from /usr/include/g++-3/cstdio:6,
>                  from glade--.cc:28:
> /usr/include/stdio.h:239: type specifier omitted for parameter
> /usr/include/stdio.h:239: parse error before `)'
> 
> 
> Line 239 of stdio.h:
> 
> 
> extern FILE *fopencookie (void *__restrict __magic_cookie,
> 			  __const char *__restrict __modes,
> 			  _IO_cookie_io_functions_t __io_funcs) __THROW;
> 
> 
> If I just comment that line out in stdio.h, then it compiles and links
> just fine.  I was seeing this before, but had not mentioned it yet.  I
> had posted elsewhere wondering if I found a bug of some sort in
> stdio.h.  It belongs to package glibc-devel-2.2.5-16mdk  I have updated
> Mandrake since I installed it, tonight even, so if it is a bug, they
> have not fixed it yet I don't think.
> 
> Mark
> 
>

-- 
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diff -U3 -r glademm-1.1.2-old/configure.in glademm-1.1.2/configure.in
--- glademm-1.1.2-old/configure.in	Wed Oct 30 08:09:59 2002
+++ glademm-1.1.2/configure.in	Fri Nov  1 10:11:04 2002
@@ -74,9 +74,10 @@
 
 if test ! "x$ac_domainname_standard" = "xyes" ; then
 AC_MSG_CHECKING(whether utsname contains domainname when _GNU_SOURCE is set)
+save_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -D_GNU_SOURCE"
 AC_TRY_COMPILE(
 [
-#define _GNU_SOURCE
 #include <sys/utsname.h>
 ],[
    struct utsname uts;
@@ -86,15 +87,17 @@
    AC_DEFINE(HAS_DOMAINNAME)
    AC_DEFINE(_GNU_SOURCE)
 ])
+CXXFLAGS="$save_CXXFLAGS"
 AC_MSG_RESULT([$ac_domainname_gnusrc])
 fi
 
 if test "x$ac_domainname_standard" != "xyes" \
 		-a "x$ac_domainname_gnusrc$" != "xyes" ; then
 AC_MSG_CHECKING(whether utsname contains domainname when __USE_GNU is set)
+save_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -D__USE_GNU"
 AC_TRY_COMPILE(
 [
-#define __USE_GNU
 #include <sys/utsname.h>
 ],[
    struct utsname uts;
@@ -104,6 +107,7 @@
    AC_DEFINE(HAS_DOMAINNAME)
    AC_DEFINE(__USE_GNU)
 ])
+CXXFLAGS="$save_CXXFLAGS"
 AC_MSG_RESULT([$ac_domainname_usegnu])
 fi