Enable libstdc++ compilation on AVR targets

Enable libstdc++ compilation in AVR targets with AVR-Libc. Most
floating point math functions are already defined in AVR-Libc, so
defines are in place to avoid multiple definition of these functions.

2016-12-06  Felipe Magno de Almeida  <felipe@expertisesolutions.com.br>

	* crossconfig.m4: Add avr target for cross-compilation.
	* configure: Regenerate.

From-SVN: r243309

libstdc++-v3/ChangeLog

+2016-12-06  Felipe Magno de Almeida  <felipe@expertisesolutions.com.br>
+
+	* crossconfig.m4: Add avr target for cross-compilation.
+	* configure: Regenerate.
+
 2016-12-06  Jonathan Wakely  <jwakely@redhat.com>
 
 	* python/libstdcxx/v6/printers.py (StdVariantPrinter): Update for new

libstdc++-v3/configure

@@ -28902,6 +28902,55 @@ case "${host}" in
     # This is a freestanding configuration; there is nothing to do here.
     ;;
 
+  avr*-*-*)
+    $as_echo "#define HAVE_ACOSF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_ASINF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_ATAN2F 1" >>confdefs.h
+
+    $as_echo "#define HAVE_ATANF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_CEILF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_COSF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_COSHF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_EXPF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_FABSF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_FLOORF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_FMODF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_FREXPF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_SQRTF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_HYPOTF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_LDEXPF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_LOG10F 1" >>confdefs.h
+
+    $as_echo "#define HAVE_LOGF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_MODFF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_POWF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_SINF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_SINHF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_TANF 1" >>confdefs.h
+
+    $as_echo "#define HAVE_TANHF 1" >>confdefs.h
+
+    ;;
+
   mips*-sde-elf*)
     # These definitions are for the SDE C library rather than newlib.
     SECTION_FLAGS='-ffunction-sections -fdata-sections'

libstdc++-v3/crossconfig.m4

@@ -9,6 +9,32 @@ case "${host}" in
     # This is a freestanding configuration; there is nothing to do here.
     ;;
 
+  avr*-*-*)
+    AC_DEFINE(HAVE_ACOSF)
+    AC_DEFINE(HAVE_ASINF)
+    AC_DEFINE(HAVE_ATAN2F)
+    AC_DEFINE(HAVE_ATANF)
+    AC_DEFINE(HAVE_CEILF)
+    AC_DEFINE(HAVE_COSF)
+    AC_DEFINE(HAVE_COSHF)
+    AC_DEFINE(HAVE_EXPF)
+    AC_DEFINE(HAVE_FABSF)
+    AC_DEFINE(HAVE_FLOORF)
+    AC_DEFINE(HAVE_FMODF)
+    AC_DEFINE(HAVE_FREXPF)
+    AC_DEFINE(HAVE_SQRTF)
+    AC_DEFINE(HAVE_HYPOTF)
+    AC_DEFINE(HAVE_LDEXPF)
+    AC_DEFINE(HAVE_LOG10F)
+    AC_DEFINE(HAVE_LOGF)
+    AC_DEFINE(HAVE_MODFF)
+    AC_DEFINE(HAVE_POWF)
+    AC_DEFINE(HAVE_SINF)
+    AC_DEFINE(HAVE_SINHF)
+    AC_DEFINE(HAVE_TANF)
+    AC_DEFINE(HAVE_TANHF)
+    ;;
+
   mips*-sde-elf*)
     # These definitions are for the SDE C library rather than newlib.
     SECTION_FLAGS='-ffunction-sections -fdata-sections'