build system (first pass)

std/build/build.bro

@@ -0,0 +1,17 @@
+# Build configuration surface for `brolang build` (v0).
+#
+# A project's `build.bro` imports this module and declares a top-level constant
+# named `config` of type `BuildConfig`. `brolang build [root]` type-checks
+# build.bro, reads the config, and compiles the program package it names.
+#
+# Declarative and literal-only: one executable per build. List fields take an
+# address-of an array literal (`&["raylib"]`); empty lists are written `&[]`.
+BuildConfig :: struct {
+	name      []u8      # output executable name
+	source    []u8      # program package directory, relative to build.bro
+	libraries [][]u8    # library names to link (-l)
+	lib_paths [][]u8    # library search directories (-L)
+	includes  [][]u8    # C include directories (-I)
+	defines   [][]u8    # C preprocessor defines (name or name=value)
+	links     [][]u8    # extra linker inputs (object/source files, -framework pairs)
+}