[UNIKRAFT PATCH 7/7] build: Support generating C/C++ headers with pre-processing

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Supports generating C/C++ header files by the pre-processing rules
of the build system.

Example:
 LIBMYLIB_SRCS += $(LIBMYLIB_BASE)/header.m4>.h

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 support/build/Makefile.rules | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/support/build/Makefile.rules b/support/build/Makefile.rules
index 1aca3391..48c3f4ff 100644
--- a/support/build/Makefile.rules
+++ b/support/build/Makefile.rules
@@ -602,6 +602,16 @@ endef
 # Aliases for pre-processed files (e.g., *.in)
 buildrule_in   = $(call buildrule_noop_,$(1),$(2))
 
+# Aliases for C headers
+buildrule_h   = $(call buildrule_noop_,$(1),$(2))
+
+# Aliases for C++ headers
+buildrule_hp  = $(call buildrule_noop_,$(1),$(2))
+buildrule_hh  = $(call buildrule_noop_,$(1),$(2))
+buildrule_hpp = $(call buildrule_noop_,$(1),$(2))
+buildrule_HPP = $(call buildrule_noop_,$(1),$(2))
+buildrule_H   = $(call buildrule_noop_,$(1),$(2))
+
 # wrapper for buildrule_*,
 # selects appropriate buildrule depending on file extension,
 # if there is no such buildrule available, we throw an error.
-- 
2.20.1