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-rw-r--r--Makefile19
1 files changed, 18 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 65e54a18b6..29591284bd 100644
--- a/Makefile
+++ b/Makefile
@@ -84,7 +84,7 @@ subdirs	:= $(filter mach,$(subdirs)) $(filter hurd,$(subdirs)) \
 headers := errno.h sys/errno.h errnos.h limits.h values.h	\
 	   features.h gnu-versions.h libc-lock.h
 aux	 = sysdep $(libc-init) version
-before-compile = $(objpfx)version-info.h
+before-compile = $(objpfx)version-info.h $(objpfx)features.h
 
 echo-headers: subdir_echo-headers
 
@@ -151,6 +151,23 @@ $(objpfx)version-info.h: $(+sysdir_pfx)config.make $(all-Banner-files)
 version.c-objects := $(addprefix $(objpfx)version,$(object-suffixes))
 $(version.c-objects): $(objpfx)version-info.h
 
+$(objpfx)features.h: features.h.in Makefile $(common-objpfx)soversions.mk
+	nr="$(libc.so-version)"; \
+	if test -n $$nr; then \
+	  nr=`echo $$nr | sed 's/^[.]//'`; \
+	  tmpfile=$${TMPDIR:-/tmp}/sedtmp.$$$$; \
+	  rm -f $$tmpfile; \
+	  (echo '/^INTERFACENUMBER/ { i\'; \
+	   echo '/* Interface number of the shared library.  */\'; \
+	   echo "#define	__GNU_LIBRARY_INTERFACE__	$$nr"; \
+	   echo '  s/^INTERFACENUMBER//'; \
+	   echo '}') > $$tmpfile; \
+	  sed -f $$tmpfile < $< > $@; \
+	  rm -f $$tmpfile; \
+	else \
+	  sed -e '/^INTERFACENUMBER/d' < $< > $@; \
+	fi
+
 # Makerules creates a file `stub-$(subdir)' for each subdirectory, which
 # contains `#define __stub_FUNCTION' for each function which is a stub.
 # Here we paste all of these together into <stubs.h>.