host_target_combination.patch

From: Christian Prochaska <christian.prochaska@genode-labs.com>

Remove sanity check for host/target combination in configure script of
libstdc++. An alternative fix would be the addition of a new host or
the use of an existing one. However, adding a new host would require
us to maintain a larger patch to the GCC build system, and using an
existing host comes with all the (possibly unwanted) policies associated
with the respective host platform. We want to stick with the bare-bone
compiler as much as possible.
---
 libstdc++-v3/configure      |   24 +++++++++++-------------
 libstdc++-v3/crossconfig.m4 |    1 -
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 0e9e28a..5a9f1ee 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -3025,8 +3025,7 @@ test -n "$target_alias" &&
 target_alias=${target_alias-$host_alias}
 
 # Handy for debugging:
-{ $as_echo "$as_me:${as_lineno-$LINENO}: $build / $host / $target / $host_alias / $target_alias" >&5
-$as_echo "$as_me: $build / $host / $target / $host_alias / $target_alias" >&6;}; sleep 5
+#AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5
 
 if test "$build" != "$host"; then
   # We are being configured with some form of cross compiler.
@@ -11498,7 +11497,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11501 "configure"
+#line 11500 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11604,7 +11603,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11607 "configure"
+#line 11606 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14962,7 +14961,7 @@ fi
     #
     # Fake what AC_TRY_COMPILE does.  XXX Look at redoing this new-style.
     cat > conftest.$ac_ext << EOF
-#line 14965 "configure"
+#line 14964 "configure"
 struct S { ~S(); };
 void bar();
 void foo()
@@ -15297,7 +15296,7 @@ $as_echo "$glibcxx_cv_atomic_long_long" >&6; }
   # Fake what AC_TRY_COMPILE does.
 
     cat > conftest.$ac_ext << EOF
-#line 15300 "configure"
+#line 15299 "configure"
 int main()
 {
   typedef bool atomic_type;
@@ -15332,7 +15331,7 @@ $as_echo "$glibcxx_cv_atomic_bool" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15335 "configure"
+#line 15334 "configure"
 int main()
 {
   typedef short atomic_type;
@@ -15367,7 +15366,7 @@ $as_echo "$glibcxx_cv_atomic_short" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15370 "configure"
+#line 15369 "configure"
 int main()
 {
   // NB: _Atomic_word not necessarily int.
@@ -15403,7 +15402,7 @@ $as_echo "$glibcxx_cv_atomic_int" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15406 "configure"
+#line 15405 "configure"
 int main()
 {
   typedef long long atomic_type;
@@ -15482,7 +15481,7 @@ $as_echo "$as_me: WARNING: Performance of certain classes will degrade as a resu
   # unnecessary for this test.
 
     cat > conftest.$ac_ext << EOF
-#line 15485 "configure"
+#line 15484 "configure"
 int main()
 {
   _Decimal32 d1;
@@ -15524,7 +15523,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   # unnecessary for this test.
 
     cat > conftest.$ac_ext << EOF
-#line 15527 "configure"
+#line 15526 "configure"
 template<typename T1, typename T2>
   struct same
   { typedef T2 type; };
@@ -15558,7 +15557,7 @@ $as_echo "$enable_int128" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15561 "configure"
+#line 15560 "configure"
 template<typename T1, typename T2>
   struct same
   { typedef T2 type; };
@@ -64099,7 +64098,6 @@ $as_echo "$ac_ld_relro" >&6; }
 
     ;;
   *)
-    as_fn_error "No support for this host/target combination." "$LINENO" 5
    ;;
 esac
 
diff --git a/libstdc++-v3/crossconfig.m4 b/libstdc++-v3/crossconfig.m4
index 361ed0b..98d68ec 100644
--- a/libstdc++-v3/crossconfig.m4
+++ b/libstdc++-v3/crossconfig.m4
@@ -264,7 +264,6 @@ case "${host}" in
     AC_DEFINE(HAVE_TANHF)
     ;;
   *)
-    AC_MSG_ERROR([No support for this host/target combination.])
    ;;
 esac
 ])