[ expat-Bugs-842049 ] Configure script error - CC or CPP

Bugs item #842049, was opened at 2003-11-14 06:48
Message generated for change (Comment added) made by fdrake
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110127&aid=842049&group_id=10127

Category: None
Group: None
>Status: Closed
>Resolution: Out of Date
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Greg Stein (gstein)
Summary: Configure script error - CC or CPP

Initial Comment:
expat-1.95.7

My check install is in a none standard location.

I set the CFLAGS enviroment variable so the file could 
be found.  You then get a configure warning:


configure: WARNING: check.h: accepted by the 
compiler, rejected by the preprocessor!
configure: WARNING: check.h: proceeding with the 
preprocessor's result


This seems to be due to the preprocessor check using 
CPP and the CPPFLAGS while the compiler check uses 
CC and CFLAGS.



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>Comment By: Fred L. Drake, Jr. (fdrake)
Date: 2005-01-27 23:45

Message:
Logged In: YES 
user_id=3066

Expat 1.95.9 will no longer use the check library; I'm
closing this as out-of-date.

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Comment By: Magnus Henoch (legoscia)
Date: 2004-10-10 11:40

Message:
Logged In: YES 
user_id=920364

This patch seems to fix the problem. (I found no way to
attach it...)
Can it be installed in CVS?

Index: conftools/expat.m4
===================================================================
RCS file: /cvsroot/expat/expat/conftools/expat.m4,v
retrieving revision 1.1
diff -u -r1.1 expat.m4
--- conftools/expat.m4	9 Nov 2001 04:55:33 -0000	1.1
+++ conftools/expat.m4	10 Oct 2004 15:26:46 -0000
@@ -1,6 +1,6 @@
 dnl Check if --with-expat[=PREFIX] is specified and
 dnl Expat >= 1.95.0 is installed in the system.
-dnl If yes, substitute EXPAT_CFLAGS, EXPAT_LIBS with regard to
+dnl If yes, substitute EXPAT_CPPFLAGS, EXPAT_LIBS with
regard to
 dnl the specified PREFIX and set with_expat to PREFIX, or
'yes' if PREFIX
 dnl has not been specified. Also HAVE_LIBEXPAT,
HAVE_EXPAT_H are defined.
 dnl If --with-expat has not been specified, set with_expat
to 'no'.
@@ -14,11 +14,11 @@
 
   AM_CONDITIONAL(EXPAT_INSTALLED, test $with_expat != no)
 
-  EXPAT_CFLAGS=
+  EXPAT_CPPFLAGS=
   EXPAT_LIBS=
   if test $with_expat != no; then
 	if test $with_expat != yes; then
-		EXPAT_CFLAGS="-I$with_expat/include"
+		EXPAT_CPPFLAGS="-I$with_expat/include"
 		EXPAT_LIBS="-L$with_expat/lib"
 	fi
 	AC_CHECK_LIB(expat, XML_ParserCreate,
@@ -29,15 +29,24 @@
 	if test $expat_found = no; then
 		AC_MSG_ERROR([Could not find the Expat library])
 	fi
-	expat_save_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS $EXPAT_CFLAGS"
+	expat_save_CPPFLAGS="$CPPFLAGS"
+	CPPFLAGS="$CPPFLAGS $EXPAT_CPPFLAGS"
 	AC_CHECK_HEADERS(expat.h, , expat_found=no)
 	if test $expat_found = no; then
 		AC_MSG_ERROR([Could not find expat.h])
 	fi
-	CFLAGS="$expat_save_CFLAGS"
+	CPPFLAGS="$expat_save_CPPFLAGS"
   fi
 
+  AC_SUBST(EXPAT_CPPFLAGS)
   AC_SUBST(EXPAT_CFLAGS)
   AC_SUBST(EXPAT_LIBS)
+
+  # Earlier versions of this script incorrectly used CFLAGS
instead
+  # of CPPFLAGS, causing preprocessor-only autoconf tests
to fail
+  # when expat was installed in a nonstandard location. 
The following
+  # lines make sure that existing scripts depending on this bug
+  # still work.
+  EXPAT_CFLAGS="$EXPAT_CPPFLAGS"
+  AC_SUBST(EXPAT_CFLAGS)
 ])

Magnus


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