Split autoconf macros out of aclocal.m4

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@9470 72102866-910b-0410-8b05-ffd578937521

config/objc-sys-dynamic.m4

@@ -0,0 +1,85 @@
+AC_DEFUN(OBJC_SYS_DYNAMIC_LINKER,
+[dnl
+AC_REQUIRE([OBJC_CON_AUTOLOAD])dnl
+#--------------------------------------------------------------------
+# Guess the type of dynamic linker for the system
+#
+# Makes the following substitutions:
+#	DYNAMIC_LINKER	- cooresponds to the interface that is included
+#		in objc-load.c (i.e. #include "${DYNAMIC_LINKER}-load.h")
+#--------------------------------------------------------------------
+DYNAMIC_LINKER=null
+AC_CHECK_HEADER(dlfcn.h, DYNAMIC_LINKER=simple)
+if test $DYNAMIC_LINKER = null; then
+  AC_CHECK_HEADER(dl.h, DYNAMIC_LINKER=hpux)
+fi
+if test $DYNAMIC_LINKER = null; then
+  AC_CHECK_HEADER(windows.h, DYNAMIC_LINKER=win32)
+fi
+if test $DYNAMIC_LINKER = null; then
+  AC_CHECK_HEADER(dld/defs.h, DYNAMIC_LINKER=dld)
+fi
+
+if test $DYNAMIC_LINKER = simple; then
+  AC_TRY_LINK([#include <dlfcn.h>], dladdr(0,0);, 
+	      AC_DEFINE(HAVE_DLADDR))
+fi
+
+AC_SUBST(DYNAMIC_LINKER)dnl
+])
+AC_DEFUN(OBJC_SYS_DYNAMIC_FLAGS,
+[dnl
+AC_REQUIRE([OBJC_CON_AUTOLOAD])dnl
+AC_REQUIRE([OBJC_SYS_DYNAMIC_LINKER])dnl
+#--------------------------------------------------------------------
+# Set the flags for compiling dynamically loadable objects
+#
+# Makes the following substitutions:
+#	DYNAMIC_BUNDLER_LINKER - The command to link the object files into
+#		a dynamically loadable module.
+#	DYNAMIC_LDFLAGS - Flags required when compiling the main program
+#		that will do the dynamic linking
+#	DYNAMIC_CFLAGS - Flags required when compiling the object files that
+#		will be included in the loaded module.
+#--------------------------------------------------------------------
+if test $DYNAMIC_LINKER = dld; then
+    DYNAMIC_BUNDLER_LINKER="ld -r"
+    DYNAMIC_LDFLAGS="-static"
+    DYNAMIC_CFLAGS=""
+elif test $DYNAMIC_LINKER = simple; then
+    save_LDFLAGS=$LDFLAGS
+    LDFLAGS="-shared"
+    AC_TRY_LINK([extern void loadf();], loadf();, 
+	        objc_shared_linker=yes, objc_shared_linker=no)
+    LDFLAGS=$save_LDFLAGS
+    if test $objc_shared_linker = yes; then
+      DYNAMIC_BUNDLER_LINKER='$(CC) -shared'
+    elif test $objc_cv_con_autoload = yes; then 
+      DYNAMIC_BUNDLER_LINKER='$(CC) -Xlinker -r'
+    else
+      DYNAMIC_BUNDLER_LINKER='$(CC) -nostdlib'
+    fi
+    save_LDFLAGS=$LDFLAGS
+    LDFLAGS="-rdynamic"
+    AC_TRY_RUN([], objc_dynamic_ldflag="-rdynamic", objc_dynamic_ldflag="",
+	objc_dynamic_ldflag="")
+    LDFLAGS=$save_LDFLAGS
+    DYNAMIC_LDFLAGS="$objc_dynamic_ldflag"
+    DYNAMIC_CFLAGS="-fPIC"
+elif test $DYNAMIC_LINKER = hpux; then
+    DYNAMIC_BUNDLER_LINKER='$(CC) -nostdlib -Xlinker -b'
+    DYNAMIC_LDFLAGS="-Xlinker -E"
+    DYNAMIC_CFLAGS="-fPIC"
+elif test $DYNAMIC_LINKER = null; then
+    DYNAMIC_BUNDLER_LINKER='$(CC) -nostdlib -Xlinker -r'
+    DYNAMIC_LDFLAGS=""
+    DYNAMIC_CFLAGS=""
+else
+    DYNAMIC_BUNDLER_LINKER='$(CC) -nostdlib -Xlinker -r'
+    DYNAMIC_LDFLAGS=""
+    DYNAMIC_CFLAGS=""
+fi
+AC_SUBST(DYNAMIC_BUNDLER_LINKER)dnl
+AC_SUBST(DYNAMIC_LDFLAGS)dnl
+AC_SUBST(DYNAMIC_CFLAGS)dnl
+])