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, 28 insertions, 0 deletions

diff --git a/mkdeps.sh b/mkdeps.sh
new file mode 100755
index 00000000..440b5600
--- /dev/null
+++ b/mkdeps.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+set -eu
+
+varlist() {
+	printf '%s = \\\n' "$1"
+	sed 's|^\(.*\)$|\t\1 \\|'
+	printf '\n'
+}
+
+cfiles() {
+	git ls-files src/ | grep '\.c$' | grep -v '^src/main\.c$' | sort
+}
+
+export LANG=POSIX.UTF-8
+
+find doc/*.en.*.in 2>/dev/null | sort | varlist 'manpages.en.in' ||:
+echo 'manpages.in = $(manpages.en.in)'
+printf 'catalogs.en.msg = %s\n' "$(find src/ -name '*.msg')"
+echo 'catalogs.msg = $(catalogs.en.msg)'
+printf '\n'
+
+find tests/fuzz/*.c | sort | varlist 'fuzz.c'
+find tests/fuzz/*.c | sort | awk -F. '{ printf "%s.xa: %s.o\n", $1, $1 }'
+find tests/fuzz/*.c | sort | awk -F. '{ printf "%s.bin-check: %s.bin\n", $1, $1 }'
+printf '\n\n'
+
+cfiles | varlist 'sources.c'
+ldev deps $(cfiles)