feat(third_party/bazel): Check in rules_haskell from Tweag

third_party/bazel/rules_haskell/tests/library-with-sysincludes/BUILD.bazel

@@ -0,0 +1,86 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+package(default_testonly = 1)
+
+genrule(
+    name = "genrule-header",
+    outs = [
+        "include/foo.h",
+    ],
+    cmd = "touch $(location include/foo.h)",
+)
+
+# A locally-defined replica of @zlib.dev//:zlib.
+# Since that shared library lives in another package, we must
+# use an absolute path for strip_include_prefix.
+cc_library(
+    name = "zlib",
+    hdrs = ["@zlib.dev//:include"],
+    strip_include_prefix = "/external/zlib.dev/include",
+    tags = ["requires_zlib"],
+    deps = ["@zlib"],
+)
+
+cc_library(
+    name = "zlib-with-genrule-header",
+    hdrs = [":genrule-header"],
+    strip_include_prefix = "include",
+    tags = ["requires_zlib"],
+)
+
+haskell_library(
+    name = "intermediate-library",
+    srcs = ["IntLib.hsc"],
+    tags = ["requires_zlib"],
+    deps = [
+        ":zlib",
+        ":zlib-with-genrule-header",
+        "//tests/hackage:base",
+    ],
+)
+
+haskell_library(
+    name = "library-with-sysincludes",
+    srcs = [
+        "Lib.hs",
+        "TH.hs",
+    ],
+    tags = ["requires_zlib"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":intermediate-library",
+        "//tests/hackage:base",
+        "//tests/hackage:template-haskell",
+    ],
+)
+
+# Replicate the above example, but use the externally-defined
+# cc_library rule.
+haskell_library(
+    name = "intermediate-library-other",
+    srcs = ["IntLib.hsc"],
+    tags = ["requires_zlib"],
+    deps = [
+        ":zlib-with-genrule-header",
+        "//tests/hackage:base",
+        "@zlib.dev//:zlib",
+    ],
+)
+
+haskell_library(
+    name = "library-with-sysincludes-other",
+    srcs = [
+        "Lib.hs",
+        "TH.hs",
+    ],
+    tags = ["requires_zlib"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":intermediate-library-other",
+        "//tests/hackage:base",
+        "//tests/hackage:template-haskell",
+    ],
+)

third_party/bazel/rules_haskell/tests/library-with-sysincludes/IntLib.hsc

@@ -0,0 +1,15 @@
+{-# LANGUAGE CPP #-}
+
+module IntLib (crc) where
+
+import Foreign.Ptr
+import Foreign.C.Types
+
+#include <zlib.h>
+#include "foo.h"
+
+foreign import ccall crc32 :: CLong -> Ptr () -> CInt -> IO ()
+
+crc = crc32 0 nullPtr 0
+
+z = #{size struct gz_header_s}

third_party/bazel/rules_haskell/tests/library-with-sysincludes/Lib.hs

@@ -0,0 +1,8 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+module Lib (bar) where
+
+import TH (foo)
+
+bar :: IO ()
+bar = $foo

third_party/bazel/rules_haskell/tests/library-with-sysincludes/TH.hs

@@ -0,0 +1,9 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+module TH (foo) where
+
+import IntLib (crc)
+import Language.Haskell.TH
+
+foo :: Q Exp
+foo = [| crc |]