fix(3p/nix): Build glog as included CMake project

third_party/nix/CMakeLists.txt

@@ -11,7 +11,6 @@ find_package(Boost COMPONENTS context) # probably coroutine + ::headers, lets fi
 find_package(CURL)
 find_package(SQLite3)
 find_package(Threads)
-find_package(glog)
 find_package(LibLZMA)
 
 # Abseil really doesn't like being precompiled. It is included here as
@@ -24,6 +23,12 @@ find_package(LibLZMA)
 # link to the Abseil sources in the Nix store.
 add_subdirectory(abseil_cpp)
 
+# Linking precompiled glog binaries (linked against libstdc++) leads
+# to working binaries that do not output log messages. It seems that
+# in order to use glog with LLVM & libc++, one needs to make glog a
+# part of the local project build.
+add_subdirectory(glog)
+
 # generate a configuration file (autoheader-style) to configure
 # certain symbols that Nix depends on.
 configure_file(config.h.in nix_config.h @ONLY)

third_party/nix/default.nix

@@ -19,7 +19,8 @@ in pkgs.llvmPackages.libcxxStdenv.mkDerivation {
 
   # Abseil's sources need to be symlinked into Nix' sources.
   postUnpack = ''
-    ln -fs ${pkgs.abseil_cpp.src} nix/abseil_cpp
+    ln -fs ${pkgs.abseil_cpp.drvAttrs.src} nix/abseil_cpp
+    ln -fs ${pkgs.glog.drvAttrs.src} nix/glog
   '';
 
   nativeBuildInputs = with pkgs; [
@@ -34,8 +35,6 @@ in pkgs.llvmPackages.libcxxStdenv.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
@@ -43,7 +42,6 @@ in pkgs.llvmPackages.libcxxStdenv.mkDerivation {
     curl
     editline
     flex
-    glog
     largeBoehm
     libseccomp
     libsodium

third_party/nix/glog

@@ -0,0 +1 @@
+../glog/