[PATCH 2/9 v2] libc: add rule to generate ucontext_i.{c, h, s} files and clean them

[Florian Fainelli]

This patch adds the required rules to generate the ucontext_i.{c,h,s}
files from the architecture specific ucontext_i.sym file. Such files are
required to properly support user-space context functions
({get,set,swap,make}context), and as such is made conditional on
UCLIBC_HAS_CONTEXT_FUNCS.

Signed-off-by: Florian Fainelli <florian at openwrt.org>
---
Changes since v1:
- integrated the .gitignore hunk into this patch
- use pregen-headers-y target to generate ucontext_i.h
- use headers_clean-y to clean up generated files

 libc/.gitignore                        |    1 +
 libc/sysdeps/linux/Makefile.commonarch |   21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 libc/.gitignore

diff --git a/libc/.gitignore b/libc/.gitignore
new file mode 100644
index 0000000..f4c0305
--- /dev/null
+++ b/libc/.gitignore
@@ -0,0 +1 @@
+ucontext_i.[chs]
diff --git a/libc/sysdeps/linux/Makefile.commonarch b/libc/sysdeps/linux/Makefile.commonarch
index c1bc5df..9b72a0e 100644
--- a/libc/sysdeps/linux/Makefile.commonarch
+++ b/libc/sysdeps/linux/Makefile.commonarch
@@ -37,5 +37,24 @@ headers-y += $(ARCH_HEADERS_OUT)
 headers_clean-y += HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT))
 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) $< > $@
+
+pregen-headers-$(UCLIBC_HAS_CONTEXT_FUNCS) += $(ARCH_OUT)/ucontext_i.h
+
+headers_clean-$(UCLIBC_HAS_CONTEXT_FUNCS) += \
+	HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i)
+
+HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i):
+	$(do_rm) $(addprefix $(ARCH_OUT)/ucontext_i., c h s)
+
-- 
1.7.10.4