Include Build Files, Update Fallthrough Condition

	* *.mk
		- Included configuration and build specification files
	
	* subnom.c
		- Added an if statement to catch when cmdbuf->command == 0 in runcmd() 
		  to ensure the default behaviour is looking up the provided term.
		  This will need to be revisited and most likely addressed earlier in the call chain.
	
	* README.md
		- Updated with dependency information and initial installation instructions.

Author: newnix

README.md

@@ -22,8 +22,35 @@ Runtime Dependencies:
 	* A POSIX-ish OS
 	* A C99 compliant C library (optional)
 	* The SQLite3 library (optional)
+	
+	Note: These are optional runtime deps due to the possibility of static linking. In the default scenario, 
+	dynamic linking is used instead, and requires the libraries to be available at runtime to work properly. 
 
 
+# Installation
+After cloning the repo, you can run `make help` to see the current build settings. The defaults should be fine for most 
+installs, though the primary options can be set through `make config` which will open up your `$EDITOR` to view/edit
+`config.mk`.
+
+These build flags should be appropriate for all UNIX-like systems aside from MacOS, in which case the "failsafe" settings should allow 
+the build to complete without issue. Simply uncomment the line desired to use either GCC or Clang/LLVM to build `nombre(1)` and comment out
+the other two.
+
+If you do not wish to have `nombre(1)` installed to `${HOME}/nombre/bin`, simply change the values of `PREFIX` and `DESTDIR` in `config.mk` 
+to reflect the desired installation directory. Just take note of any necessary permissions if installing outside of your home directory. 
+You will also need to ensure that whatever directory you install to is in your `PATH`, so in the default scenario, you'd want to run something 
+like the following (assuming Bash is the interactive shell being used):
+
+```
+export PATH="${PATH}:${HOME}/bin"
+printf "export %s=%s\n" "PATH" "${PATH}" >> ${HOME}/.bashrc
+```
+
+There may be some non-portable flags in use which will hinder installation on other platforms, but I'm in the process of testing on
+Alpine Linux and Ubuntu to ensure that where possible, only portable interfaces/flags are used or are appropriately fenced off behind 
+an `#ifdef`. Please let me know if any errors are encountered so they can be addressed as swiftly as possible. If it's a problem encountered
+when using the `nombre(1)` utility, please include the runtime traces from using the `-D` flag. 
+
 ## Interface
 The `nombre(1)` interface is a semi-natural language command line primarily driven by the use of subcommands,
 which will then construct and run SQL queries to interface with the database on your behalf. This allows 

clang-opts.mk

@@ -0,0 +1,9 @@
+## Compilation and Linking settings when using Clang/LLVM
+CC = clang
+LD = lld
+
+WRN = -Wextra -Wall -Weverything -Wdeprecated -pedantic -Werror -Wno-padded -Wno-cast-qual
+CFLAGS = ${WRN} -std=${STD} -Oz -fpic -fpie -pipe -fPIC -fPIE -fvectorize -fstack-protector \
+				 -fstrict-enums -fstrict-return -fstack-protector-strong -fmerge-all-constants -fstack-protector-all \
+				 -Qn -fstrict-aliasing -ffunction-sections -fdata-sections
+LDFLAGS = -z relro -z now -z combreloc #--icf=safe

config.mk

@@ -0,0 +1,26 @@
+## Set up some variables for use in building nombre
+## Used as a means of working around Makefile limitations and portability concerns
+
+## Uncomment to force a debug build
+#DBG = -g3 -NOMBRE_DEBUG
+
+## Set the library and include paths
+INCS = -I/usr/include -I/usr/local/include
+LIBS = -L/usr/lib -L/usr/local/lib
+
+## Library linkages
+LINKTO = -lc -lsqlite3 -lpthread
+
+## Define where the binary will be installed
+## Default is ${HOME}/bin
+PREFIX = ${HOME}
+DESTDIR = /bin
+
+## Comment out to not use Clang
+include clang-opts.mk
+
+## Uncomment to use GCC
+#include gcc-opts.mk
+
+## Uncomment for "failsafe" settings
+#include failsafe.mk

failsafe.mk

@@ -0,0 +1,5 @@
+## Presumed safe compilation/linking settings
+CC = cc 
+LD = ld
+CFLAGS = -std=${STD} -O2 -fpic -fpie
+LDFLAGS = 

gcc-opts.mk

@@ -0,0 +1,8 @@
+## Compiler and Linker settings for using GCC
+CC = gcc
+LD = ld
+
+WRN = -pedantic -Wno-alignment -Werror -Wall
+CFLAGS = ${WRN} -std=${STD} -Os -fpic -fpie -pipe -fPIC -fPIE -fstack-protector-all -fstack-protector-strong \
+				 -fstrict-aliasing -ffunction-sections -fdata-sections
+LDFLAGS = -z combreloc -z now -z relro -fpie -fpic --icf=safe

subnom.c

@@ -172,6 +172,11 @@ runcmd(nomcmd * restrict cmdbuf, int genlen) {
 
 	if ((retc = sqlite3_prepare_v2(cmdbuf->dbcon, cmdbuf->gensql, genlen, &stmt, &sqltail)) != SQLITE_OK) {
 		NOMERR("Error compiling SQL (%s)!\n", sqlite3_errstr(sqlite3_errcode(cmdbuf->dbcon)));
+	} else {
+		/* XXX: This should be handled elsewhere */
+		if (cmdbuf->command == 0) {
+			cmdbuf->command = lookup;
+		}
 	}
 	/* 
 	 * Determine how to best proceed with processing the statement based on