From ab57cbaccccb30fd743ba3283251430e6bc3a071 Mon Sep 17 00:00:00 2001
From: Dan Nicholson <dbn.lists@gmail.com>
Date: Wed, 26 Dec 2007 11:12:29 -0600
Subject: autoconf: Helper options for adding GCC 32/64 bit flags

Two new configure options to add -m32 or -m64 to the CFLAGS and CXXFLAGS
when GCC is in use. By default, the user supplied options are
environment variables are respected, but these options are quick helps
for the common case of x86/x86_64 using GCC.
---
 configure.ac | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index f2f2d75a1a..2acbd67e51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,6 +79,38 @@ AC_ARG_VAR(ARCH_FLAGS, [Additional architecture specific flags for the
 AC_SUBST(OPT_FLAGS)
 AC_SUBST(ARCH_FLAGS)
 
+dnl
+dnl Hacks to enable 32 or 64 bit build
+dnl
+AC_ARG_ENABLE(32-bit,
+    [AS_HELP_STRING([--enable-32-bit],
+        [build 32-bit libraries @<:@default=auto@:>@])],
+    enable_32bit="$enableval",
+    enable_32bit=auto
+)
+if test "x$enable_32bit" = xyes; then
+    if test "x$GCC" = xyes; then
+        CFLAGS="$CFLAGS -m32"
+    fi
+    if test "x$GXX" = xyes; then
+        CXXFLAGS="$CXXFLAGS -m32"
+    fi
+fi
+AC_ARG_ENABLE(64-bit,
+    [AS_HELP_STRING([--enable-64-bit],
+        [build 64-bit libraries @<:@default=auto@:>@])],
+    enable_64bit="$enableval",
+    enable_64bit=auto
+)
+if test "x$enable_64bit" = xyes; then
+    if test "x$GCC" = xyes; then
+        CFLAGS="$CFLAGS -m64"
+    fi
+    if test "x$GXX" = xyes; then
+        CXXFLAGS="$CXXFLAGS -m64"
+    fi
+fi
+
 dnl
 dnl shared/static libraries, mimic libtool options
 dnl
-- 
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