2002-12-27 Roland McGrath <roland@redhat.com>

* scripts/gen-as-const.awk: New file.
	* Makefile (distribute): Add it.
	* Makerules ($(common-objpfx)%.h %.h.d: %.sym): New pattern rule.
	(before-compile): Add $(gen-as-const-headers:%.sym=$(common-objpfx)%.h)
	to the list.
	(+depfiles): Add $(addprefix $(common-objpfx),$(gen-as-const-headers)).

Makefile

@@ -280,7 +280,7 @@ distribute  :=	README README.libm INSTALL FAQ FAQ.in NOTES NEWS BUGS	\
 			    test-installation.pl gen-FAQ.pl versions.awk\
 			    gen-sorted.awk abi-versions.awk abilist.awk	\
 			    firstversions.awk documented.sh cpp		\
-			    output-format.sed)
+			    output-format.sed gen-as-const.awk)
 
 distribute := $(strip $(distribute))
 generated := $(generated) stubs.h

Makerules

@@ -663,7 +663,8 @@ ifeq ($(build-programs),yes)
 endif
 +depfiles := $(addprefix $(objpfx),\
 			 $(filter-out $(addsuffix .d,$(omit-deps)),\
-				      $(+depfiles)))
+				      $(+depfiles))) \
+	     $(addprefix $(common-objpfx),$(gen-as-const-headers:.sym=.h.d))
 
 ifdef +depfiles
 ifneq ($(no_deps),t)
@@ -1177,6 +1178,23 @@ common-generated += libc.symlist
 endif
 
 endif
+
+# Generating headers for assembly constants.
+$(common-objpfx)%.h $(common-objpfx)%.h.d: $(..)scripts/gen-as-const.awk %.sym
+	$(AWK) -f $^ \
+	| $(CC) -S -o - $(CFLAGS) $(CPPFLAGS) -x c - \
+		-MD -MF $(@:.h=.h.d)T -MT '$(@:.h=.h.d) $(@:.h.d=.h)' \
+	| sed -n 's/^.*@@@name@@@\([^@]*\)@@@value@@@[^@]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*$$/#define \1 \2/p' > $(@:.h.d=.h)T
+	sed $(sed-remove-objpfx) \
+	    -e 's@  *\([^ 	\/][^ 	\]*\)@ $$(..)\1@g' \
+	    -e 's@  *\.\.\/\([^ 	\]*\)@ $$(..)\1@g' \
+	    $(@:.h=.h.d)T > $(@:.h=.h.d)T2
+	rm -f $(@:.h=.h.d)T
+	mv -f $(@:.h=.h.d)T2 $(@:.h=.h.d)
+	mv -f $(@:.h.d=.h)T $(@:.h.d=.h)
+vpath %.sym $(sysdirs)
+
+before-compile += $(gen-as-const-headers:%.sym=$(common-objpfx)%.h)
 
 .PHONY: TAGS
 TAGS: $(objpfx)distinfo $(..)MakeTAGS

scripts/gen-as-const.awk

@@ -0,0 +1,29 @@
+# Script used in producing headers of assembly constants from C expressions.
+# The input to this script looks like:
+#	#cpp-directive ...
+#	NAME1
+#	NAME2 expression ...
+# The output of this script is C code to be run through gcc -S and then
+# massaged to extract the integer constant values of the given C expressions.
+# A line giving just a name implies an expression consisting of just that name.
+
+BEGIN { started = 0 }
+
+# cpp directives go straight through.
+/^#/ { print; next }
+
+NF >= 1 && !started {
+  print "void dummy(void) {";
+  started = 1;
+}
+
+NF == 1 { sub(/^.*$/, "& &"); }
+
+NF > 1 {
+  name = $1;
+  sub(/^[^ 	]+[ 	]+/, "");
+  printf "asm (\"@@@name@@@%s@@@value@@@%%0@@@end@@@\" : : \"i\" (%s));\n",
+    name, $0;
+}
+
+END { if (started) print "}" }