buck: build libz

Signed-off-by: Austin Seipp <aseipp@pobox.com>

buck/third-party/libz/BUILD

@@ -0,0 +1,66 @@
+
+load("@root//buck/shims/jj.bzl", "jj")
+
+VERSION = '1.3.1'
+
+http_archive(
+    name = 'src',
+    sha256 = '9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23',
+    urls = [
+        f'https://github.com/madler/zlib/releases/download/v{VERSION}/zlib-{VERSION}.tar.gz',
+    ],
+    type = 'tar.gz',
+    strip_prefix = f'zlib-{VERSION}',
+    sub_targets = [
+        "adler32.c",
+        "compress.c",
+        "crc32.c",
+        "deflate.c",
+        "infback.c",
+        "inffast.c",
+        "inflate.c",
+        "inftrees.c",
+        "trees.c",
+        "uncompr.c",
+        "zutil.c",
+        "gzclose.c",
+        "gzlib.c",
+        "gzread.c",
+        "gzwrite.c",
+        "zlib.h",
+        "zconf.h",
+    ],
+)
+
+jj.cxx_library(
+    name = 'libz',
+    srcs = [
+        ':src[adler32.c]',
+        ':src[compress.c]',
+        ':src[crc32.c]',
+        ':src[deflate.c]',
+        ':src[infback.c]',
+        ':src[inffast.c]',
+        ':src[inflate.c]',
+        ':src[inftrees.c]',
+        ':src[trees.c]',
+        ':src[uncompr.c]',
+        ':src[zutil.c]',
+        ':src[gzclose.c]',
+        ':src[gzlib.c]',
+        ':src[gzread.c]',
+        ':src[gzwrite.c]',
+    ],
+    preferred_linkage = "static",
+    headers = [],
+    header_namespace = "",
+    exported_headers = {
+        'zconf.h': ':src[zconf.h]',
+        'zlib.h': ':src[zlib.h]',
+    },
+    compiler_flags = [
+        "-DSTDC",
+        "-D_LARGEFILE64_SOURCE",
+        "-D_POSIX_SOURCE",
+    ],
+)

buck/third-party/libz/PACKAGE

@@ -0,0 +1,5 @@
+
+package(
+    inherit = True,
+    visibility = [ 'PUBLIC' ],
+)