auto-detect the right flag for the compiler to produce PIC code

(This used to be commit 5d92e003978f02e53c0886508ccefc8c24ec1bbf)

source3/aclocal.m4

@@ -48,3 +48,16 @@ if test $ac_cv_dirent_d_off = yes; then
   AC_DEFINE(HAVE_DIRENT_D_OFF)
 fi
 ])
+
+
+dnl AC_PROG_CC_FLAG(flag)
+AC_DEFUN(AC_PROG_CC_FLAG,
+[AC_CACHE_CHECK(whether ${CC-cc} accepts -$1, ac_cv_prog_cc_$1,
+[echo 'void f(){}' > conftest.c
+if test -z "`${CC-cc} -$1 -c conftest.c 2>&1`"; then
+  ac_cv_prog_cc_$1=yes
+else
+  ac_cv_prog_cc_$1=no
+fi
+rm -f conftest*
+])])

source3/configure.in

@@ -24,7 +24,6 @@ SAMBA_MAINTAINER_MODE
 # how to compile C code to produce PIC object files
 
 # these are the defaults, good for lots of systems
-PICFLAG="-fpic"
 HOST_OS="$host_os"
 LDSHFLAGS="-shared"
 
@@ -32,13 +31,13 @@ LDSHFLAGS="-shared"
 case "$host_os" in
 	*linux*)   AC_DEFINE(LINUX);;
         *solaris*) AC_DEFINE(SUNOS5)
-                   LDSHFLAGS="-G";;
+                   LDSHFLAGS="-G"
+		   ;;
         *sunos*) AC_DEFINE(SUNOS4)
                 LDSHFLAGS=""
 		;;
         *irix*) AC_DEFINE(IRIX)
 		WRAP32=smbwrapper/smbwrapper.32.so
-		PICFLAG="-KPIC"
 		;;
         *aix*) AC_DEFINE(AIX);;
         *hpux*) AC_DEFINE(HPUX);;
@@ -48,6 +47,27 @@ case "$host_os" in
         *next2*) AC_DEFINE(NEXT2);;
 esac
 
+
+# try to work out how to produce pic code with this compiler
+PICFLAG=""
+AC_PROG_CC_FLAG(fpic)
+if test $ac_cv_prog_cc_fpic = yes; then
+   PICFLAG="-fpic";
+fi
+if test x$PICFLAG = x; then
+  AC_PROG_CC_FLAG(Kpic)
+  if test $ac_cv_prog_cc_Kpic = yes; then
+    PICFLAG="-Kpic";
+  fi 
+fi
+if test x$PICFLAG = x; then
+  AC_PROG_CC_FLAG(KPIC)
+  if test $ac_cv_prog_cc_KPIC = yes; then
+    PICFLAG="-KPIC";
+  fi 
+fi
+
+
 AC_INLINE
 AC_HEADER_STDC
 AC_HEADER_DIRENT