[sword-svn] r3546 - trunk

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Author: scribe
Date: 2017-12-09 17:03:53 -0700 (Sat, 09 Dec 2017)
New Revision: 3546

Modified:
   trunk/configure.ac
Log:
fixed optimized compiling on pre-GCC 4.6 compilers (check for -Ofast and replace with -O3 if not present)


Modified: trunk/configure.ac
===================================================================
--- trunk/configure.ac	2017-12-09 23:28:34 UTC (rev 3545)
+++ trunk/configure.ac	2017-12-10 00:03:53 UTC (rev 3546)
@@ -117,8 +117,20 @@
     AM_CXXFLAGS="-O0 -Wall -Werror -Woverloaded-virtual"
   fi
 else
-  AM_CFLAGS="-Ofast"
-  AM_CXXFLAGS="-Ofast"
+  my_save_cxxflags="$CXXFLAGS"
+  CXXFLAGS=-Ofast
+  AC_MSG_CHECKING([whether CXX supports -Ofast])
+  AC_LANG_PUSH([C++])
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+      [AC_MSG_RESULT([yes])]
+      [AM_CFLAGS=-Ofast]
+      [AM_CXXFLAGS=-Ofast],
+      [AC_MSG_RESULT([no])]
+      [AM_CFLAGS=-O3]
+      [AM_CXXFLAGS=-O3],
+  )
+  CXXFLAGS="$my_save_cxxflags"
+  AC_LANG_POP([C++])
 fi
 
 AM_CFLAGS="$AM_CFLAGS -fPIC"