Fix the build system.

The improvements are:

- use most of the default "Makefile" for standard packaging;
- also use the default ".gitignore" with for the derived assets;
- don't impose so many $CFLAGS on the user.  GCC still needs to be given
  the `-ffreestanding` flag explicitly for us to get a good binary;
- stop using ad-hoc tools/* scripts, and avoid the code-generation
  anti-pattern overall on the build.  Some of the generated files were
  checked-in, and some were removed;
- remove empty files;
- use POSIX make(1) over gmake;
- add fuzz targets;
- partial "install" and "uninstall" targets;
- complete "clean" target.

The shortcomings are:
- only working on x86_64.  More platforms coming soon;
- code is still messy: way too many warnings, GNU/BSD specific
  extensions, inline assembly, and all kinds of unportable code;
- still only works with GCC and GCC-like compilers, and completly fails
  with tcc(1) and cproc(1);
- the `deps.mk` file is being maintained manually.  As I work on the
  source files I'll finish automating its generation with `mkdeps.sh`;
- still seems to be coupled with Linux;
- still is missing tests setup;
- still uses `#include <$NAME.h>` instead of the correct
  `#include "$NAME.h"` form.

The generated libgrovel.a did match the previous lib/libc.a 100%.

1 files changed, 49 insertions, 0 deletions

diff --git a/tools/lib.sh b/tools/lib.sh
new file mode 100644
index 00000000..0412d7c6
--- /dev/null
+++ b/tools/lib.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+
+assert_arg() {
+	if [ -z "$1" ]; then
+		printf 'Missing %s.\n\n' "$2" >&2
+		cat <<-'EOF'
+			usage >&2
+			exit 2
+		EOF
+	fi
+}
+
+uuid() {
+        od -xN20 /dev/urandom |
+                head -n1 |
+                awk '{OFS="-"; print $2$3,$4,$5,$6,$7$8$9}'
+}
+
+tmpname() {
+        echo "${TMPDIR:-/tmp}/uuid-tmpname with spaces.$(uuid)"
+}
+
+mkstemp() {
+	name="$(tmpname)"
+	touch "$name"
+	echo "$name"
+}
+
+mkdtemp() {
+        name="$(tmpname)"
+	mkdir "$name"
+        echo "$name"
+}
+
+END="\033[0m"
+yellow() {
+	YELLOW="\033[0;33m"
+	printf "${YELLOW}${1}${END}"
+}
+
+green() {
+	GREEN="\033[0;32m"
+	printf "${GREEN}${1}${END}"
+}
+
+red() {
+	RED="\033[0;31m"
+	printf "${RED}${1}${END}"
+}