tools/Unix.mk: Add host_info target to print nxdiag output

Nxdiag examples scripts  modified to print system information
without building and flashing nxdiag application to get report
about system without reflash or reconfigure.

Author: eren-terzioglu

Documentation/applications/system/nxdiag/index.rst

@@ -7,9 +7,12 @@ It also can be used to run a tests to verify that the vendor's tools are properl
 
 Its primary purpose is to gather information that can be used to debug problems and ease the process of reporting bugs for uninexperienced users.
 
-This tool uses a Python script (``apps/tools/host_sysinfo.py``) to gather information about the host system during build and a C
+This tool uses a Python script (``nuttx/tools/host_info_dump.py``) to gather information about the host system during build and a C
 program to gather information about the NuttX system and display all available information. For more information about the python
-script, check the command line options and code comments of ``host_sysinfo.py``.
+script, check the command line options and code comments of ``host_info_dump.py``.
+
+Alternatively, ``host_info`` target can be used without enabling nxdiag application and reflashing to get information about system. 
+Target can work after configuration step and prints information about the NuttX and host systems.
 
 .. note:: Nxdiag requires Python 3.6 or later. On Linux distributions, the ``distro`` Python module is
           recommended as it provides more accurate information about the host system.

tools/Unix.mk

@@ -162,6 +162,7 @@ all: $(BIN)
 .PHONY: context clean_context config oldconfig menuconfig nconfig qconfig gconfig export subdir_clean clean subdir_distclean distclean apps_clean apps_distclean
 .PHONY: pass1 pass1dep
 .PHONY: pass2 pass2dep
+.PHONY: host_info checkpython3
 
 # Target used to copy include/nuttx/lib/math.h.  If CONFIG_ARCH_MATH_H is
 # defined, then there is an architecture specific math.h header file
@@ -618,6 +619,35 @@ bootloader:
 clean_bootloader:
 	$(Q) $(MAKE) -C $(ARCH_SRC) clean_bootloader
 
+checkpython3:
+	@if [ -z "$$(which python3)" ]; then \
+		echo "ERROR: python3 not found in PATH"; \
+		echo "       Please install python3 or fix the PATH"; \
+		exit 1; \
+	fi
+
+# host_info target flags to get diagnostic info without building nxdiag application
+
+SYSINFO_PARSE_FLAGS = "$(realpath $(TOPDIR))"
+SYSINFO_PARSE_FLAGS += "-fsysinfo.h"
+
+SYSINFO_FLAGS = "-c"
+SYSINFO_FLAGS += "-p"
+SYSINFO_FLAGS += -f \""$(shell echo '$(CFLAGS)' | sed 's/"/\\\\\\"/g')"\"
+SYSINFO_FLAGS += \""$(shell echo '$(CXXFLAGS)' | sed 's/"/\\\\\\"/g')"\"
+SYSINFO_FLAGS += \""$(shell echo '$(LDFLAGS)' | sed 's/"/\\\\\\"/g')"\"
+SYSINFO_FLAGS += "--target_info"
+
+# host_info: Parse nxdiag example output file (sysinfo.h) and print
+
+host_info: checkpython3
+	@if [[ ! -f "sysinfo.h" ]]; then \
+		echo "file sysinfo.h not exists"; \
+		python3 $(TOPDIR)$(DELIM)tools$(DELIM)host_info_dump.py $(SYSINFO_FLAGS) \
+		 $(realpath $(TOPDIR)) > sysinfo.h; \
+	fi
+	@python3 $(TOPDIR)$(DELIM)tools$(DELIM)host_info_parse.py $(SYSINFO_PARSE_FLAGS)
+
 # pass1dep: Create pass1 build dependencies
 # pass2dep: Create pass2 build dependencies
 
@@ -801,6 +831,7 @@ endif
 	$(call DELFILE, .config.orig)
 	$(call DELFILE, .config.backup)
 	$(call DELFILE, .gdbinit)
+	$(call DELFILE, sysinfo.h)
 
 # Application housekeeping targets.  The APPDIR variable refers to the user
 # application directory.  A sample apps/ directory is included with NuttX,