Re: is libstdcv3 "supposed" to compile on mingw?

[Danny Smith <danny_r_smith_2001 at yahoo dot co dot nz>]

Re: is libstdcv3 "supposed" to compile on mingw?
From: Adam Megacz <gcc at lists dot megacz dot com> 
To: gcc at gcc dot gnu dot org 
Date: 04 Feb 2002 18:53:20 -0800 
Subject: Re: is libstdcv3 "supposed" to compile on mingw? 
Organization: Myself 
References: <86n0yoyh3p.fsf@megacz.com> <20020204183106.A6783@mediaone.net>


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


>Craig Rodrigues <rodrigc@mediaone.net> writes:
>> which might have been solved by:
>> http://gcc.gnu.org/ml/libstdc&#64509;&#46291;03/msg00144.html

>> Does that solve your problem?

> It helps, but now I get this stuff:

<snip>

/home/megacz/mingw-gcj/bin/i686-pc-mingw32/libstdcv3/include/cmath: In 
   function `float std::acos(float)':
/home/megacz/mingw-gcj/bin/i686-pc-mingw32/libstdcv3/include/cmath:104: `::
   acosf' undeclared (first use here)
/home/megacz/mingw-gcj/bin/i686-pc-mingw32/libstdcv3/include/cmath: In 
   function `float std::asin(float)':
/home/megacz/mingw-gcj/bin/i686-pc-mingw32/libstdcv3/include/cmath:122: `::
   asinf' undeclared (first use here)

That looks like a cross-compilation problem.  mingw doesn't have those. On
native build configure discovers that they are missing, and libstdc++
builds fine.


Here is an old fix from Mumit Khan (for 3.0 release) that solved the
problem back in June. I think I sent this to you earlier. It will need
refreshing to current CVS.

2001-06-20  Mumit Khan  <khan@nanotech.wisc.edu>

	* configure.in: Add Mingw cross-compilation support.
	* configure: Regenerate.

Index: libstdc++-v3/configure.in
===================================================================
RCS file:
/homes/khan/src/win32/cygwin/CVSROOT/gcc-3.0/libstdc++-v3/configure.in,v
retrieving revision 1.1.1.1
diff -u -3 -p -r1.1.1.1 configure.in
--- libstdc++-v3/configure.in	2001/06/18 19:17:34	1.1.1.1
+++ libstdc++-v3/configure.in	2001/06/19 03:14:37
@@ -178,6 +178,28 @@ if test -n "$with_cross_host"; then
 	# AC_FUNC_MMAP
 	AC_DEFINE(HAVE_MMAP)
 	;;
+    *-mingw*)
+	# Check for available headers.
+	AC_CHECK_HEADERS([nan.h ieeefp.h endian.h sys/isa_defs.h machine/endian.h
\
+	machine/param.h sys/machine.h fp.h locale.h float.h inttypes.h gconv.h])
+
+	GLIBCPP_CHECK_COMPILER_FEATURES
+	GLIBCPP_CHECK_LINKER_FEATURES
+	GLIBCPP_CHECK_BUILTIN_MATH_SUPPORT
+	GLIBCPP_CHECK_MATH_SUPPORT
+	GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
+	GLIBCPP_CHECK_WCHAR_T_SUPPORT
+	GLIBCPP_CHECK_STDLIB_SUPPORT
+
+	AC_TRY_COMPILE([
+#include <setjmp.h>
+], [sigjmp_buf env; while (! sigsetjmp (env, 1)) siglongjmp (env, 1);],
+[AC_DEFINE(HAVE_SIGSETJMP, 1, [Define if sigsetjmp is available.  ])])
+
+	AC_FUNC_MMAP
+
+	os_include_dir="config/os/mingw"
+	;;
     *)
 	# We assume newlib.  This lets us hard-code the functions we know
 	# we'll have.

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