[PATCH] vDSO hash-style fix

[deliverable/linux.git] / Documentation / kbuild / makefiles.txt

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 14ef3868a328d5080b8748507a8e8be576c936cd..0706699c9da91c7814449f41714ee883017e0a66 100644 (file)
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -407,6 +407,20 @@ more details, with real examples.
        The second argument is optional, and if supplied will be used
        if first argument is not supported.
 
+    ld-option
+       ld-option is used to check if $(CC) when used to link object files
+       supports the given option.  An optional second option may be
+       specified if first option are not supported.
+
+       Example:
+               #arch/i386/kernel/Makefile
+               vsyscall-flags += $(call ld-option, -Wl$(comma)--hash-style=sysv)
+
+       In the above example vsyscall-flags will be assigned the option
+       -Wl$(comma)--hash-style=sysv if it is supported by $(CC).
+       The second argument is optional, and if supplied will be used
+       if first argument is not supported.
+
     cc-option
        cc-option is used to check if $(CC) support a given option, and not
        supported to use an optional second option.