[6/8] Add AIX support to GLIBCXX_CROSSCONFIG

[Richard Sandiford]

This patch adds AIX cross support to libstdc++ configure.  It uses:

    GLIBCXX_CHECK_LINKER_FEATURES
    GLIBCXX_CHECK_MATH_SUPPORT
    GLIBCXX_CHECK_STDLIB_SUPPORT

just like native toolchains, and just like other cross toolchains
that require a "working" linker and access to the sysroot.

I've treated TLS as unsupported.  AIX does have a defined TLS ABI,
but we don't use it yet.  I don't think we should rely on emultls
when a dedicated ABI is available.

I've assumed /dev/random and /dev/urandom are both available.
This is certainly true on the AIX 6.1 box that I have access to.

Tested on powerpc-ibm-aix6.1 and x86_64-linux-gnu.  OK to install?

Richard


libstdc++-v3/
	* crossconfig.m4 (GLIBCXX_CROSSCONFIG): Handle AIX targets.
	* configure: Regenerate.
	
Index: libstdc++-v3/crossconfig.m4
===================================================================
--- libstdc++-v3/crossconfig.m4	2009-06-02 13:05:35.000000000 +0100
+++ libstdc++-v3/crossconfig.m4	2009-06-02 13:06:07.000000000 +0100
@@ -28,6 +28,16 @@ case "${host}" in
     AC_DEFINE(HAVE_SQRTF)
     ;;
 
+  *-aix*)
+    GLIBCXX_CHECK_LINKER_FEATURES
+    GLIBCXX_CHECK_MATH_SUPPORT
+    GLIBCXX_CHECK_STDLIB_SUPPORT
+    AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1)
+    # We don't yet support AIX's TLS ABI.
+    #GCC_CHECK_TLS
+    AM_ICONV
+    ;;
+
   *-darwin*)
     # Darwin versions vary, but the linker should work in a cross environment,
     # so we just check for all the features here.