From b2f3063cae5cd5997a89717d91fdec06c5041620 Mon Sep 17 00:00:00 2001
From: normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 24 Feb 2014 03:38:14 +0000
Subject: time: rearrange+pack vtm and time_object structs

struct time_object shrinks from 88 to 46 bytes on my 64-bit system.

* configure.in: use -Wno-packed-bitfield-compat for GCC 4.4+
  use __attribute__((packed)) if available
* timev.h: shrink and pack struct vtm
* time.c: pack struct time_object and adjust/introduce helpers
  [ruby-core:60794]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45155 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 configure.in | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index ae93ea9642..8d7bfba55e 100644
--- a/configure.in
+++ b/configure.in
@@ -746,6 +746,7 @@ if test "$GCC:${warnflags+set}:no" = yes::no; then
 		 -Werror=implicit-function-declaration \
 		 -Werror=division-by-zero \
 		 -Werror=deprecated-declarations \
+		 -Wno-packed-bitfield-compat \
 		 $extra_warning \
 		 ; do
 	if test "$particular_werror_flags" != yes; then
@@ -1271,6 +1272,15 @@ RUBY_CHECK_SIZEOF(double)
 RUBY_CHECK_SIZEOF(time_t, [long "long long"], [], [@%:@include <time.h>])
 RUBY_CHECK_SIZEOF(clock_t, [], [], [@%:@include <time.h>])
 
+AC_CACHE_CHECK(packed struct attribute, rb_cv_packed_struct,
+  [AC_TRY_COMPILE([struct { int a; } __attribute__((packed));], [],
+  [rb_cv_packed_struct=yes], [rb_cv_packed_struct=no])])
+if test "$rb_cv_packed_struct" = yes; then
+  AC_DEFINE_UNQUOTED(PACKED_STRUCT, __attribute__((packed)))
+else
+  AC_DEFINE_UNQUOTED(PACKED_STRUCT,)
+fi
+
 AC_DEFUN([RUBY_CHECK_PRINTF_PREFIX], [
 AC_CACHE_CHECK([for printf prefix for $1], [rb_cv_pri_prefix_]AS_TR_SH($1),[
     [rb_cv_pri_prefix_]AS_TR_SH($1)=[NONE]
-- 
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