Merge GDB 7.5.1

config/picflag.m4

 # _GCC_PICFLAG(FLAG, DISPATCH)
 # ----------------------------
 # Store PIC flag corresponding to DISPATCH triplet in FLAG.
 # Explit use of -fpic in CFLAGS corresponding to FLAG overrides default.
 AC_DEFUN([_GCC_PICFLAG], [
 
 case "${$2}" in
     # PIC is the default on some targets or must not be used.
     *-*-darwin*)
         # PIC is the default on this platform
         # Common symbols not allowed in MH_DYLIB files
         $1=-fno-common
         ;;
     alpha*-dec-osf5*)
         # PIC is the default.
         ;;
     hppa*64*-*-hpux*)
         # PIC is the default for 64-bit PA HP-UX.
         ;;
     i[[34567]]86-*-cygwin* | i[[34567]]86-*-mingw* | x86_64-*-mingw*)
         ;;
-    i[[34567]]86-*-interix3*)
+    i[[34567]]86-*-interix[[3-9]]*)
         # Interix 3.x gcc -fpic/-fPIC options generate broken code.
         # Instead, we relocate shared libraries at runtime.
         ;;
     i[[34567]]86-*-nto-qnx*)
         # QNX uses GNU C++, but need to define -shared option too, otherwise
         # it will coredump.
         $1='-fPIC -shared'
         ;;
     i[[34567]]86-pc-msdosdjgpp*)
         # DJGPP does not support shared libraries at all.
@@ skipping 11 matching lines @@
         ;;
 
     # Some targets support both -fPIC and -fpic, but prefer the latter.
     # FIXME: Why?
     i[[34567]]86-*-* | x86_64-*-*)
         $1=-fpic
         ;;
     m68k-*-*)
         $1=-fpic
         ;;
-    s390*-*-*)
-        $1=-fpic
-        ;;
     # FIXME: Override -fPIC default in libgcc only? 
     sh-*-linux* | sh[[2346lbe]]*-*-linux*)
         $1=-fpic
         ;;
     # FIXME: Simplify to sh*-*-netbsd*?
     sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
       sh64-*-netbsd* | sh64l*-*-netbsd*)
         $1=-fpic
         ;;
     # Default to -fPIC unless specified otherwise.
@@ skipping 19 matching lines @@
 AC_DEFUN([GCC_PICFLAG], [
   AC_REQUIRE([AC_CANONICAL_HOST])
   _GCC_PICFLAG([PICFLAG], [host])])
 
 # GCC_PICFLAG_FOR_TARGET
 # ----------------------
 # Store target PIC flag in PICFLAG_FOR_TARGET.
 AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [
   AC_REQUIRE([AC_CANONICAL_TARGET])
   _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])])