buildsys: tweak ucontext_i.h prerequisites

ucontext_i.h too depends on uClibc_config.h.
Update it to look like the other MANGLE generated files and tweak
prereqs

Fixes: make realclean ; make -j libc/misc/internals/__uClibc_main.i

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Makefile.in

@@ -57,8 +57,9 @@ ifeq ($(HAVE_DOT_CONFIG),y)
 $(top_builddir)include/bits/uClibc_config.h: $(conf) $(KCONFIG_CONFIG) $(top_srcdir)extra/scripts/conf-header.sh | $(top_builddir)include/bits
 	@$(disp_gen)
 	$(Q)$< -s $(Kconfig)
-	$(Q)$(top_srcdir)extra/scripts/conf-header.sh $(KCONFIG_CONFIG) > $@
+	$(Q)$(top_srcdir)extra/scripts/conf-header.sh $(KCONFIG_CONFIG) > $@.tmp
 	$(Q)$(MAKE) headers-y
+	$(Q)mv $@.tmp $@
 
 # The above doesn't work for threads, though. Just using check-symlinks for now.
 # XXX: FIXME: this is ugly
@@ -183,7 +184,10 @@ headers-y += $(target-headers-sysdep)
 
 headers: $(top_builddir)include/bits/uClibc_config.h | subdirs
 subdirs: $(addprefix $(top_builddir),$(subdirs))
-pregen-headers: $(top_builddir)include/bits/sysnum.h $(pregen-headers-y)
+
+$(pregen-headers-y): $(headers_dep)
+
+pregen-headers: $(pregen-headers-y)
 pregen: headers pregen-headers
 	$(Q)$(if $(UCLIBC_HAS_LOCALE),$(MAKE) -C extra/locale locale_headers)
 

Rules.mak

@@ -165,7 +165,8 @@ libpthread.depend := $(top_builddir)lib/libpthread.so
 endif
 interp := $(top_builddir)lib/interp.os
 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
-headers_dep := $(top_builddir)include/bits/sysnum.h
+headers_dep := $(top_builddir)include/bits/sysnum.h \
+	$(top_builddir)include/bits/uClibc_config.h
 sub_headers := $(headers_dep)
 
 #LIBS :=$(interp) -L$(top_builddir)lib -lc

libc/sysdeps/linux/Makefile.commonarch

@@ -47,16 +47,13 @@ HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)):
 	$(do_rm) $(ARCH_HEADERS_OUT)
 endif
 
-CFLAGS-ucontext_i.c = -S
-
-$(ARCH_OUT)/ucontext_i.c: $(ARCH_DIR)/ucontext_i.sym
-	$(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< > $@
-
-$(ARCH_OUT)/ucontext_i.s: $(ARCH_OUT)/ucontext_i.c
-	$(compile.c)
-
-$(ARCH_OUT)/ucontext_i.h: $(ARCH_OUT)/ucontext_i.s
-	$(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
+$(ARCH_OUT)/ucontext_i.h: $(top_srcdir)extra/scripts/gen-as-const.awk
+$(ARCH_OUT)/ucontext_i.h: $(ARCH_OUT)/ucontext_i.sym
+	@$(disp_gen)
+	$(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< \
+	| $(CC) $(CFLAGS) -x c - -S -o - \
+	| $(SED) $(PTHREAD_GENERATE_MANGLE) > $@
+	@if test ! -s $@ ; then rm -f $@ ; false ; fi
 
 pregen-headers-$(UCLIBC_HAS_CONTEXT_FUNCS) += $(ARCH_OUT)/ucontext_i.h
 

libpthread/nptl/Makefile.in

@@ -92,7 +92,7 @@ $(top_builddir)lib/libpthread.a: $(libpthread-a-y)
 	$(Q)$(RM) $@
 	$(do_ar)
 
-$(libpthread_OUT)/pthread-errnos.h: $(top_srcdir)extra/scripts/gen-as-const.awk | headers
+$(libpthread_OUT)/pthread-errnos.h: $(top_srcdir)extra/scripts/gen-as-const.awk
 $(libpthread_OUT)/pthread-errnos.h: $(libpthread_DIR)/pthread-errnos.sym
 	@$(disp_gen)
 	$(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< \

libpthread/nptl/sysdeps/Makefile.commonarch

@@ -40,7 +40,7 @@ librt_arch_COBJ = $(patsubst %.c,$(libpthread_arch_OUT)/%.o,$(librt_arch_CSRC))
 librt_arch_SOBJ = $(patsubst %.S,$(libpthread_arch_OUT)/%.o,$(librt_arch_SSRC))
 librt_arch_OBJS = $(librt_arch_COBJ) $(librt_arch_SOBJ)
 
-$(libpthread_arch_OUT)/tcb-offsets.h: $(top_srcdir)extra/scripts/gen-as-const.awk | headers
+$(libpthread_arch_OUT)/tcb-offsets.h: $(top_srcdir)extra/scripts/gen-as-const.awk
 $(libpthread_arch_OUT)/tcb-offsets.h: $(libpthread_arch_DIR)/tcb-offsets.sym
 	@$(disp_gen)
 	$(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< \

libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch

@@ -137,7 +137,7 @@ endif
 PTHREAD_LINUX_SYM   := $(notdir $(wildcard $(libpthread_linux_DIR)/*.sym))
 PTHREAD_LINUX_SYM_H := $(addprefix $(libpthread_linux_OUT)/,$(PTHREAD_LINUX_SYM:.sym=.h))
 
-$(PTHREAD_LINUX_SYM_H): $(top_srcdir)extra/scripts/gen-as-const.awk | headers
+$(PTHREAD_LINUX_SYM_H): $(top_srcdir)extra/scripts/gen-as-const.awk
 $(PTHREAD_LINUX_SYM_H): $(libpthread_linux_OUT)/%.h: $(libpthread_linux_DIR)/%.sym
 	@$(disp_gen)
 	$(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< \