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List:       flightgear-devel
Subject:    Re: [Flightgear-devel] Re: Fix for compilation error in
From:       Mathias =?iso-8859-1?q?Fr=F6hlich?= <Mathias.Froehlich () web ! de>
Date:       2004-01-29 9:13:00
Message-ID: 200401291013.00559.Mathias.Froehlich () web ! de
[Download RAW message or body]

Hi,

> [autoconf problems with truncf]

If I look into config.log, I find the lines

configure:9991: checking for truncf
configure:10041: gcc -o conftest -O2 -march=athlon -msse -mfpmath=sse 
-I/home/flightgear/sw/include -I/usr/X1
1R6/include -L/home/flightgear/sw/lib -L/usr/X11R6/lib conftest.c -ldl -lm   
-lglut -lGLU -lGL -lXmu -lXt -lS
M -lICE -lXi -lXext -lX11 -ldl -lm  >&5
configure:10044: $? = 0
configure:10047: test -s conftest
configure:10050: $? = 0
configure:10061: result: yes

for the truncf check on my machine. What I see here is gcc not g++.
I would guess that this will make the difference.
So moving the test for truncf in between this
AC_LANG_PUSH(C++)
...
AC_LANG_POP
lines might help.
I think that most of these functions which are tested using the C compiler 
will actually be used in C++ code. So moving more of these functions out of 
the line
AC_CHECK_FUNCS( <many functions ...> truncf )
might be a good idea.

So, at final, does the attached patch help?
Of course autogen.sh and configure have to be executed past patching.

    Greetings

        Mathias

-- 
Mathias Fröhlich, email: Mathias.Froehlich@web.de

["configure.patch" (text/x-diff)]

--- configure.ac.orig	2004-01-29 10:07:23.496868234 +0100
+++ configure.ac	2004-01-29 10:07:52.072834221 +0100
@@ -427,6 +427,8 @@
 fi
 AM_CONDITIONAL(ENABLE_JPEG_SERVER, test "x$ac_cv_header_simgear_screen_jpgfactory_hxx" = "xyes")
 
+AC_CHECK_FUNCS( [ \
+	truncf ] )
 AC_LANG_POP
 
 dnl Check for system installed zlib
@@ -465,7 +467,7 @@
 AC_CHECK_FUNCS( [ \
         ftime gettimeofday timegm memcpy bcopy mktime strstr rand mkfifo \
 	random drand48 setitimer getitimer signal GetLocalTime rint getrusage \
-	truncf ] )
+	] )
 LIBS=$old_LIBS
 
 AM_CONFIG_HEADER(src/Include/config.h)


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