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-rw-r--r--elf/Makefile13
1 files changed, 10 insertions, 3 deletions
diff --git a/elf/Makefile b/elf/Makefile
index e3bd69223a..94074f3e34 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -353,9 +353,16 @@ $(objpfx)ld.so: $(objpfx)librtld.os $(ld-map)
 	  | $(AWK) '($$7 ~ /^UND(|EF)$$/ && $$1 != "0:" && $$4 != "REGISTER") { print; p=1 } END { exit p != 0 }'
 	mv -f $@.new $@
 
-# interp.c exists just to get this string into the libraries.
-CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"'
-$(objpfx)interp.os: $(common-objpfx)config.make
+# interp.c exists just to get the runtime linker path into libc.so.
+$(objpfx)interp.os: $(elf-objpfx)runtime-linker.h
+
+$(elf-objpfx)runtime-linker.h: $(elf-objpfx)runtime-linker.st; @:
+$(elf-objpfx)runtime-linker.st: $(common-objpfx)config.make
+	$(name-target-directory)
+	echo '#define RUNTIME_LINKER "$(rtlddir)/$(rtld-installed-name)"' \
+		> ${@:st=T}
+	$(move-if-change) ${@:st=T} ${@:st=h}
+	touch $@
 
 ifneq (ld.so,$(rtld-installed-name))
 # Make sure ld.so.1 exists in the build directory so we can link