From 058dd113ccd4c2f95d5a7e248bd5d87caa1eb281 Mon Sep 17 00:00:00 2001
From: Ivan Maidanski <ivmai@mail.ru>
Date: Wed, 28 Mar 2012 07:59:09 +0400
Subject: Fix configure to define __PIC__ macro explicitly only if not done by
 GCC

* configure.ac (PICFLAG): Adjust AC_MSG_CHECKING message; report
"none" result if no -fPIC is needed (for Cygwin/MinGW); determine
whether GCC -fPIC option causes __PIC__ macro definition; pass
-D __PIC__ to PICFLAG (instead of CFLAGS) only if not defined
automatically in case -fPIC specified; update comment.
---
 configure.ac | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index c76a348..69aad25 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,24 +18,32 @@ LT_INIT([disable-shared])
 # Checks for functions.
 AC_FUNC_MMAP
 
-# Determine PIC flag, adjust default CFLAGS
+# Determine PIC flag.
 need_asm=false
 PICFLAG=
-AC_MSG_CHECKING(Determining PIC compiler flag)
+AC_MSG_CHECKING(for PIC compiler flag)
 if test "$GCC" = yes; then
   case "$host" in
-    *-*-solaris*)
-      AC_MSG_RESULT(-fPIC)
-      PICFLAG=-fPIC
-      # Workaround: at least GCC 3.4.6 does not define this macro.
-      CFLAGS="-D__PIC__=1 $CFLAGS"
-      ;;
     *-*-cygwin* | *-*-mingw*)
       # Cygwin and Mingw[-w32/64] do not need -fPIC.
+      AC_MSG_RESULT("<none>")
       ;;
     *)
       AC_MSG_RESULT(-fPIC)
       PICFLAG=-fPIC
+      AC_MSG_CHECKING(whether gcc -fPIC causes __PIC__ definition)
+      # Workaround: at least GCC 3.4.6 (Solaris) does not define this macro.
+      old_CFLAGS="$CFLAGS"
+      CFLAGS="$PICFLAG $CFLAGS"
+      AC_TRY_COMPILE([],[
+ #ifndef __PIC__
+ # error
+ #endif
+      ], [ac_cv_pic_macro=yes], [ac_cv_pic_macro=no])
+      CFLAGS="$old_CFLAGS"
+      AC_MSG_RESULT($ac_cv_pic_macro)
+      AS_IF([test "$ac_cv_pic_macro" = yes], [],
+            [PICFLAG="-D__PIC__=1 $PICFLAG"])
       ;;
   esac
 
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