Generate bits/syscall.h with biarch support.

sysdeps/unix/sysv/linux/x86_64/Makefile

@@ -1,4 +1,46 @@
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl
 sysdep_headers += sys/perm.h sys/reg.h sys/debugreg.h sys/io.h
+
+no_syscall_list_h = 1
+
+# Generate the list of SYS_* macros for the system calls (__NR_* macros).
+$(objpfx)syscall-%.h $(objpfx)syscall-%.d: ../sysdeps/unix/sysv/linux/sys/syscall.h
+	rm -f $(@:.h=.d)-t
+	{ \
+	 echo '/* Generated at libc build time from kernel syscall list.  */';\
+	 echo ''; \
+	 echo '#ifndef _SYSCALL_H'; \
+	 echo '# error "Never use <bits/syscall.h> directly; include <sys/syscall.h> instead."'; \
+	 echo '#endif'; \
+	 echo ''; \
+	 SUNPRO_DEPENDENCIES='$(@:.h=.d)-t $@' \
+	 $(CC) -E -x c $(sysincludes) $< -U__x86_64__ -D_LIBC -dM | \
+	 sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \
+	 LC_ALL=C sort > $(@:.d=.h).new32; \
+	 SUNPRO_DEPENDENCIES='$(@:.h=.d)-t $@' \
+	 $(CC) -E -x c $(sysincludes) $< -D__x86_64 -D_LIBC -dM | \
+	 sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \
+	 LC_ALL=C sort > $(@:.d=.h).new64; \
+	 if cmp -s $(@:.d=.h).new32 $(@:.d=.h).new64; then \
+	   cat $(@:.d=.h).new32; \
+	 else \
+	   echo '#include <bits/wordsize.h>'; \
+	   echo ''; \
+	   comm -12 $(@:.d=.h).new32 $(@:.d=.h).new64; \
+	   echo '#if __WORDSIZE == 64'; \
+	   comm -13 $(@:.d=.h).new32 $(@:.d=.h).new64; \
+	   echo '#else'; \
+	   comm -23 $(@:.d=.h).new32 $(@:.d=.h).new64; \
+	   echo '#endif'; \
+	 fi; \
+	 rm -f $(@:.d=.h).new32 $(@:.d=.h).new64; \
+	} > $(@:.d=.h).new
+	mv -f $(@:.d=.h).new $(@:.d=.h)
+	sed < $(@:.h=.d)-t > $(@:.h=.d)-t2 \
+	    -e 's,$(subst .,\.,$@),$(patsubst $(objpfx)%,$$(objpfx)%,\
+					      $(@:.d=.h) $(@:.h=.d)),'
+	rm -f $(@:.h=.d)-t
+	mv -f $(@:.h=.d)-t2 $(@:.h=.d)
+
 endif