libm: Fix an issue that public header files are not exported

Fix an issue that math library header files are not exported by make export.
Create symbolic links of libmcs, newlib and openlibm header to nuttx/include.

libs/libm/libmcs/Make.defs

@@ -20,6 +20,7 @@
 
 LIBMCS_VERSION=1.2.0
 
+ifeq ($(wildcard libmcs/libmcs/.git),)
 libmcs-$(LIBMCS_VERSION).zip:
 	$(call DOWNLOAD,https://gitlab.com/gtd-gmbh/libmcs/-/archive/$(LIBMCS_VERSION),libmcs-$(LIBMCS_VERSION).zip,libmcs.zip)
 
@@ -32,18 +33,20 @@ libmcs/libmcs: libmcs-$(LIBMCS_VERSION).zip
 	$(Q) patch -p1 < libmcs/0004-Fix-warning-function-declaration-isn-t-a-prototype-W.patch
 	$(Q) patch -p1 < libmcs/0005-libm-libmcs-Fix-clang-build-libmcs-warning.patch
 	$(Q) touch $@
+endif
 
-ifeq ($(wildcard libmcs/libmcs/.git),)
 distclean::
+	$(Q) $(DIRUNLINK) $(TOPDIR)/include/libmcs
+ifeq ($(wildcard libmcs/libmcs/.git),)
 	$(call DELFILE, libmcs.zip)
 	$(call DELDIR, libmcs/libmcs)
-
-context:: libmcs/libmcs
-else
-distclean::
-context::
 endif
 
+$(TOPDIR)/include/libmcs: libmcs/libmcs
+	$(Q) $(DIRLINK) $(CURDIR)/libmcs/libmcs/libm/include $@
+
+context:: $(TOPDIR)/include/libmcs
+
 VPATH += :libmcs/libmcs/libm/common
 VPATH += :libmcs/libmcs/libm/complexd
 VPATH += :libmcs/libmcs/libm/complexd/internal

libs/libm/newlib/Make.defs

@@ -30,6 +30,7 @@ else
   NEWLIB_TARBALL=$(NEWLIB_BASENAME)-$(NEWLIB_VERSION).tar.gz
 endif
 
+ifeq ($(wildcard newlib/newlib/.git),)
 $(NEWLIB_BASENAME)-$(NEWLIB_VERSION).tar.gz:
 	$(call DOWNLOAD,$(NEWLIB_URL_BASE),$(NEWLIB_TARBALL),$(NEWLIB_BASENAME)-$(NEWLIB_VERSION).tar.gz)
 
@@ -39,18 +40,20 @@ newlib/newlib: $(NEWLIB_BASENAME)-$(NEWLIB_VERSION).tar.gz
 	$(Q) patch -p0 < newlib/0001-newlib-libm-fix-__RCSID-build-error.patch
 	$(Q) patch -p0 < newlib/0002-newlib-libm-remove-include-reent.h.patch
 	$(Q) touch $@
+endif
 
-ifeq ($(wildcard newlib/newlib/.git),)
 distclean::
+	$(Q) $(DIRUNLINK) $(TOPDIR)/include/newlib
+ifeq ($(wildcard newlib/newlib/.git),)
 	$(call DELFILE, $(NEWLIB_BASENAME)-$(NEWLIB_VERSION).tar.gz)
 	$(call DELDIR, newlib/newlib)
-
-context:: newlib/newlib
-else
-distclean::
-context::
 endif
 
+$(TOPDIR)/include/newlib: newlib/newlib
+	$(Q) $(DIRLINK) $(CURDIR)/newlib/include $@
+
+context:: $(TOPDIR)/include/newlib
+
 CSRCS += $(wildcard newlib/newlib/newlib/libm/common/*.c)
 CSRCS += $(wildcard newlib/newlib/newlib/libm/complex/*.c)
 

libs/libm/openlibm/Make.defs

@@ -21,6 +21,7 @@
 
 OPENLIBM_VERSION=0.8.1
 
+ifeq ($(wildcard openlibm/openlibm/.git),)
 openlibm-$(OPENLIBM_VERSION).zip:
 	$(call DOWNLOAD,https://github.com/JuliaMath/openlibm/archive/refs/tags,v$(OPENLIBM_VERSION).zip,openlibm.zip)
 
@@ -29,17 +30,20 @@ openlibm/openlibm: openlibm-$(OPENLIBM_VERSION).zip
 	$(Q) mv openlibm-$(OPENLIBM_VERSION) openlibm/openlibm
 	$(Q) patch -p0 < openlibm/0001-fix-build-float_t-error-float_t-has-not-been-declare.patch
 	$(Q) patch -p0 < openlibm/0002-add-math.h-and-complex.h-to-openlibm.patch
+endif
 
-ifeq ($(wildcard openlibm/openlibm/.git),)
 distclean::
+	$(Q) $(DIRUNLINK) $(TOPDIR)/include/openlibm
+ifeq ($(wildcard openlibm/openlibm/.git),)
 	$(call DELFILE, openlibm.zip)
 	$(call DELDIR, openlibm/openlibm)
-context:: openlibm/openlibm
-else
-distclean::
-context::
 endif
 
+$(TOPDIR)/include/openlibm: openlibm/openlibm
+	$(Q) $(DIRLINK) $(CURDIR)/openlibm/openlibm/include $@
+
+context:: $(TOPDIR)/include/openlibm
+
 # OS-specific stuff
 # Get ARCH, it is used to read source code file list form $(ARCH)/Make.files
 ifeq ($(CONFIG_ARCH),sim)

tools/Config.mk

@@ -658,20 +658,20 @@ else
 endif
 
 ifeq ($(CONFIG_LIBM_NEWLIB),y)
-  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)newlib$(DELIM)include
+  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)newlib
-  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)newlib$(DELIM)include
+  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)newlib
 endif
 
 #libmcs`s math.h should include after libcxx, or it will override libcxx/include/math.h and build error
 ifeq ($(CONFIG_LIBM_LIBMCS),y)
   ARCHDEFINES += ${DEFINE_PREFIX}LIBMCS_LONG_DOUBLE_IS_64BITS
-  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)libmcs$(DELIM)libmcs$(DELIM)libm$(DELIM)include
+  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)libmcs
-  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)libmcs$(DELIM)libmcs$(DELIM)libm$(DELIM)include
+  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)libmcs
 endif
 
 ifeq ($(CONFIG_LIBM_OPENLIBM),y)
-  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)openlibm$(DELIM)openlibm$(DELIM)include
+  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)openlibm
-  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)openlibm$(DELIM)openlibm$(DELIM)include
+  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)openlibm
 endif
 
 ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include