Initial commit I guess

.buckconfig

@@ -0,0 +1,27 @@
+[cells]
+  root = .
+  prelude = prelude
+  toolchains = toolchains
+  none = none
+
+[cell_aliases]
+  config = prelude
+  ovr_config = prelude
+  fbcode = none
+  fbsource = none
+  fbcode_macros = none
+  buck = none
+
+# Uses a copy of the prelude bundled with the buck2 binary. You can alternatively delete this
+# section and vendor a copy of the prelude to the `prelude` directory of your project.
+[external_cells]
+  prelude = bundled
+
+[parser]
+  target_platform_detector_spec = target:root//...->prelude//platforms:default
+
+[build]
+  execution_platforms = prelude//platforms:default
+
+[project]
+  ignore = .git

.gitignore

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+/buck-out

BUCK

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+# A list of available rules and their signatures can be found here: https://buck2.build/docs/prelude/globals/
+
+genrule(
+    name = "hello_world",
+    out = "out.txt",
+    cmd = "echo BUILT BY BUCK2> $OUT",
+)
+
+cxx_binary(
+    name = "main",
+    srcs = ["main.cpp"],
+    link_style = "static",
+)

main.cpp

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+#include <stdio.h>
+
+int main() {
+    printf("Hello from a C++ Buck2 program!\n");
+}

toolchains/BUCK

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+load("@prelude//toolchains:cxx.bzl", "system_cxx_toolchain")
+load("@prelude//toolchains:python.bzl", "system_python_bootstrap_toolchain")
+
+# Ugh.
+system_cxx_toolchain(
+    name = "cxx",
+    visibility = ["PUBLIC"],
+
+    compiler = "gcc",
+    compiler_type = "gcc",
+    cxx_compiler = "g++",
+    rc_compiler = None,
+    cvtres_compiler = None,
+    linker = "g++",
+)
+
+system_python_bootstrap_toolchain(
+    name = "python_bootstrap",
+    visibility = ["PUBLIC"],
+)

toolchains/tools.bzl

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+load("@prelude//cxx:cxx_toolchain_types.bzl", "LinkerType")
+load("@prelude//toolchains:cxx.bzl", "CxxToolsInfo")
+
+def _path_gcc_tools_impl(_ctx) -> list[Provider]:
+    return [
+        DefaultInfo(),
+        CxxToolsInfo(
+            compiler = "gcc",
+            compiler_type = "gcc",
+            cxx_compiler = "g++",
+            asm_compiler = "gcc",
+            asm_compiler_type = "gcc",
+            rc_compiler = None,
+            cvtres_compiler = None,
+            archiver = "ar",
+            archiver_type = "gnu",
+            linker = "g++",
+            linker_type = LinkerType("gnu"),
+        ),
+    ]
+
+path_gcc_tools = rule(
+    impl = _path_gcc_tools_impl,
+    attrs = {},
+)