[PATCH] libstdc++: Disable embedded tzdata for all 16-bit targets

[Jonathan Wakely via Gcc-patches]

Tested powerpc64le-linux. Builds OK for avr too.

Roger, does this work for xstormy16?


-- >8 --

libstdc++-v3/ChangeLog:

        * acinclude.m4 (GLIBCXX_ZONEINFO_DIR): Extend logic for avr and
        msp430 to all 16-bit targets.
        * configure: Regenerate.
---
 libstdc++-v3/acinclude.m4 | 15 +++++++++------
 libstdc++-v3/configure    | 18 ++++++++++++------
 2 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 8129373e9dd..eb30c4f00a5 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -5426,12 +5426,15 @@ AC_DEFUN([GLIBCXX_ZONEINFO_DIR], [
        zoneinfo_dir=none
        ;;
     esac
-    case "$host" in
-      avr-*-* | msp430-*-* ) embed_zoneinfo=no ;;
-      *)
-       # Also embed a copy of the tzdata.zi file as a static string.
-       embed_zoneinfo=yes ;;
-    esac
+
+    AC_COMPUTE_INT(glibcxx_cv_at_least_32bit, [sizeof(void*) >= 4])
+    if test "$glibcxx_cv_at_least_32bit" -ne 0; then
+      # Also embed a copy of the tzdata.zi file as a static string.
+      embed_zoneinfo=yes
+    else
+      # The embedded data is too large for 16-bit targets.
+      embed_zoneinfo=no
+    fi
   elif test "x${with_libstdcxx_zoneinfo}" = xno; then
     # Disable tzdb support completely.
     zoneinfo_dir=none
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 188be08d716..345ba5721a8 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -71903,12 +71903,18 @@ fi
        zoneinfo_dir=none
        ;;
     esac
-    case "$host" in
-      avr-*-* | msp430-*-* ) embed_zoneinfo=no ;;
-      *)
-       # Also embed a copy of the tzdata.zi file as a static string.
-       embed_zoneinfo=yes ;;
-    esac
+
+    if ac_fn_c_compute_int "$LINENO" "sizeof(void*) >= 4" 
"glibcxx_cv_at_least_32bit"        ""; then :
+
+fi
+
+    if test "$glibcxx_cv_at_least_32bit" -ne 0; then
+      # Also embed a copy of the tzdata.zi file as a static string.
+      embed_zoneinfo=yes
+    else
+      # The embedded data is too large for 16-bit targets.
+      embed_zoneinfo=no
+    fi
   elif test "x${with_libstdcxx_zoneinfo}" = xno; then
     # Disable tzdb support completely.
     zoneinfo_dir=none
-- 
2.40.1