feat(3p/nix): Wrangle Meson/Nix/CMake into (temporary) submission

Meson is unable to use CMake in Nix to determine the internal
structure of the Abseil libraries.

This commit adds an explicit list of most of the Abseil targets that
are relevant (so far) and bundles them into a list that is linked
together.

third_party/nix/default.nix

@@ -36,6 +36,8 @@ in stdenv.mkDerivation {
 
  # TODO(tazjin): Some of these might only be required for native inputs
   buildInputs = with pkgs; [
+    # TODO(tazjin): Figure out why meson can't make the Abseil headers visible
+    abseil_cpp
     aws-s3-cpp
     boost
     brotli

third_party/nix/meson.build

@@ -345,13 +345,50 @@ config_h.set('CAN_LINK_SYMLINK', can_link_symlink,
 description : 'Whether link() works on symlinks')
 
 # Import the Abseil cmake project from the (symlinked) depot sources.
-# This will need to change if //third_party/nix is every split out as
-# a subtree.
 absl = cmake.subproject('abseil_cpp')
-absl_base = absl.dependency('base')
+
-absl_raw_logging = absl.dependency('raw_logging_internal')
+# Bundle all relevant Abseil libraries. Meson is not able to resolve
-absl_int128 = absl.dependency('int128')
+# the internal dependencies of Abseil, and reconstructing them is more
-absl_strings = absl.dependency('strings')
+# work than I am willing to invest at the moment.
+absl_deps = [
+  absl.dependency('algorithm_container'),
+  absl.dependency('base'),
+  absl.dependency('bits'),
+  absl.dependency('city'),
+  absl.dependency('config'),
+  absl.dependency('container_common'),
+  absl.dependency('container_memory'),
+  absl.dependency('core_headers'),
+  absl.dependency('debugging_internal'),
+  absl.dependency('demangle_internal'),
+  absl.dependency('dynamic_annotations'),
+  absl.dependency('endian'),
+  absl.dependency('fixed_array'),
+  absl.dependency('graphcycles_internal'),
+  absl.dependency('hash'),
+  absl.dependency('hash_function_defaults'),
+  absl.dependency('hashtablez_sampler'),
+  absl.dependency('int128'),
+  absl.dependency('malloc_internal'),
+  absl.dependency('memory'),
+  absl.dependency('meta'),
+  absl.dependency('node_hash_policy'),
+  absl.dependency('node_hash_set'),
+  absl.dependency('optional'),
+  absl.dependency('raw_hash_set'),
+  absl.dependency('raw_logging_internal'),
+  absl.dependency('spinlock_wait'),
+  absl.dependency('stacktrace'),
+  absl.dependency('strings'),
+  absl.dependency('symbolize'),
+  absl.dependency('synchronization'),
+  absl.dependency('throw_delegate'),
+  absl.dependency('time'),
+  absl.dependency('time_zone'),
+  absl.dependency('type_traits'),
+  absl.dependency('utility'),
+  absl.dependency('variant'),
+]
 
 # Look for boost, a required dependency.
 #--------------------------------------------------
@@ -450,11 +487,6 @@ if not (
     'it is too old? >= 1.14 is required.')
 endif
 
-
-# Optional dependancies
-#============================================================================
-
-
 # Look for libsodium, an optional dependency.
 #--------------------------------------------------
 libsodium_lib = cpp.find_library('sodium', required: get_option('with_libsodium'))