pkgs/development/tools/build-managers/bazel/trim-last-argument-to-gcc-if-empty.patch

   1 From 177b4720d6fbaa7fdd17e5e11b2c79ac8f246786 Mon Sep 17 00:00:00 2001
   2 From: "Wael M. Nasreddine" <wael.nasreddine@gmail.com>
   3 Date: Thu, 27 Jun 2019 21:08:51 -0700
   4 Subject: [PATCH] Trim last argument to gcc if empty, on Darwin
   5
   6 On Darwin, the last argument to GCC is coming up as an empty string.
   7 This is breaking the build of proto_library targets. However, I was not
   8 able to reproduce with the example cpp project[0].
   9
  10 This commit removes the last argument if it's an empty string. This is
  11 not a problem on Linux.
  12
  13 [0]: https://github.com/bazelbuild/examples/tree/master/cpp-tutorial/stage3
  14 ---
  15  tools/cpp/osx_cc_wrapper.sh.tpl | 6 +++++-
  16  1 file changed, 5 insertions(+), 1 deletion(-)
  17
  18 diff --git a/tools/cpp/osx_cc_wrapper.sh.tpl b/tools/cpp/osx_cc_wrapper.sh.tpl
  19 index 4c85cd9b6b..6c611e3d25 100644
  20 --- a/tools/cpp/osx_cc_wrapper.sh.tpl
  21 +++ b/tools/cpp/osx_cc_wrapper.sh.tpl
  22 @@ -53,7 +53,11 @@ done
  23  %{env}
  24
  25  # Call the C++ compiler
  26 -%{cc} "$@"
  27 +if [[ ${*: -1} = "" ]]; then
  28 +    %{cc} "${@:0:$#}"
  29 +else
  30 +    %{cc} "$@"
  31 +fi
  32
  33  function get_library_path() {
  34      for libdir in ${LIB_DIRS}; do
  35 --
  36 2.19.2
  37