macOS /usr/include/time.h __attribute__ causes c2hs to fail when building examples

[dsvensson]

$ nix-shell release.nix -A grpc-haskell.env
...
[nix-shell:~/gRPC-haskell]$ stack build --flag grpc-haskell:with-examples
grpc-haskell-core-0.0.0.0: configure (lib)
aeson-pretty-0.8.5: download
insert-ordered-containers-0.2.1.0: download
grpc-haskell-core-0.0.0.0: build (lib)
aeson-pretty-0.8.5: configure
aeson-pretty-0.8.5: build
insert-ordered-containers-0.2.1.0: configure
insert-ordered-containers-0.2.1.0: build
aeson-pretty-0.8.5: copy/register
insert-ordered-containers-0.2.1.0: copy/register
Log files have been written to: /Users/foo/gRPC-haskell/.stack-work/logs/
Progress: 3/6
--  While building custom Setup.hs for package grpc-haskell-core-0.0.0.0 using:
      /Users/foo/.stack/setup-exe-cache/x86_64-osx/Cabal-simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 --builddir=.stack-work/dist/x86_64-osx/Cabal-1.24.2.0 build lib:grpc-haskell-core --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
    Logs have been written to: /Users/foo/gRPC-haskell/.stack-work/logs/grpc-haskell-core-0.0.0.0.log

    Configuring grpc-haskell-core-0.0.0.0...
    Preprocessing library grpc-haskell-core-0.0.0.0...
    c2hs: C header contains errors:

    /usr/include/time.h:153: (column 72) [ERROR]  >>> Syntax error !
      The symbol `__attribute__' does not fit here.

[Gabriella439]

@dsvensson: Sorry for the delay in responding. In general, stack and Nix don't play well with each other because stack does not reuse the Nix logic for building Haskell dependencies (like grpc-haskell-core). I recommend using cabal build instead of stack build. However, if you still run into the same issue when using cabal build then let me know