Taken from EGLIBC, r1484 + r1525

2007-02-20  Jim Blandy  <jimb@codesourcery.com>

	* Makefile (install-headers): Preserve old behavior: depend on
	$(inst_includedir)/gnu/stubs.h only if install-bootstrap-headers
	is set; otherwise, place gnu/stubs.h on the 'install-others' list.

2007-02-16  Jim Blandy  <jimb@codesourcery.com>

        * Makefile: Amend make install-headers to install everything
        necessary for building a cross-compiler.  Install gnu/stubs.h as
        part of 'install-headers', not 'install-others'.
        If install-bootstrap-headers is 'yes', install a dummy copy of
        gnu/stubs.h, instead of computing the real thing.
        * include/stubs-bootstrap.h: New file.


--- /dev/null
+++ b/include/stubs-bootstrap.h
@@ -0,0 +1,12 @@
+/* Placeholder stubs.h file for bootstrapping.
+
+   When bootstrapping a GCC/GLIBC pair, GCC requires that the GLIBC
+   headers be installed, but we can't fully build GLIBC without that
+   GCC.  So we run the command:
+
+      make install-headers install-bootstrap-headers=yes
+
+   to install the headers GCC needs, but avoid building certain
+   difficult headers.  The <gnu/stubs.h> header depends, via the
+   GLIBC subdir 'stubs' make targets, on every .o file in GLIBC, but
+   an empty stubs.h like this will do fine for GCC.  */
--- a/Makefile
+++ b/Makefile
@@ -68,9 +68,18 @@
 vpath %.h $(subdir-dirs)
 
 # What to install.
-install-others = $(inst_includedir)/gnu/stubs.h
 install-bin-script =
 
+# If we're bootstrapping, install a dummy gnu/stubs.h along with the
+# other headers, so 'make install-headers' produces a useable include
+# tree.  Otherwise, install gnu/stubs.h later, after the rest of the
+# build is done.
+ifeq ($(install-bootstrap-headers),yes)
+install-headers: $(inst_includedir)/gnu/stubs.h
+else
+install-others = $(inst_includedir)/gnu/stubs.h
+endif
+
 ifeq (yes,$(build-shared))
 headers += gnu/lib-names.h
 endif
@@ -150,6 +159,16 @@
 
 subdir-stubs := $(foreach dir,$(subdirs),$(common-objpfx)$(dir)/stubs)
 
+# gnu/stubs.h depends (via the subdir 'stubs' targets) on all the .o
+# files in GLIBC.  For bootstrapping a GCC/GLIBC pair, an empty
+# gnu/stubs.h is good enough.
+ifeq ($(install-bootstrap-headers),yes)
+$(inst_includedir)/gnu/stubs.h: include/stubs-bootstrap.h $(+force)
+	$(make-target-directory)
+	$(INSTALL_DATA) $< $@
+
+installed-stubs =
+else
 ifndef abi-variants
 installed-stubs = $(inst_includedir)/gnu/stubs.h
 else
@@ -176,6 +195,7 @@
 
 install-others-nosubdir: $(installed-stubs)
 endif
+endif
 
 
 # Since stubs.h is never needed when building the library, we simplify the