pkgs/development/compilers/emscripten/0001-emulate-clang-sysroot-include-logic.patch

   1 From 4bbbb640934aa653bcfec0335798b77a8935b815 Mon Sep 17 00:00:00 2001
   2 From: Yureka <yuka@yuka.dev>
   3 Date: Sat, 7 Aug 2021 09:16:46 +0200
   4 Subject: [PATCH] emulate clang 'sysroot + /include' logic
   5
   6 Authored-By: Alexander Khovansky <alex@khovansky.me>
   7 Co-Authored-By: Yureka <yuka@yuka.dev>
   8
   9 Clang provided by nix patches out logic that appends 'sysroot + /include'
  10 to the include path as well as automatic inclusion of libcxx includes (/include/c++/v1).
  11 The patch below adds that logic back by introducing cflags emulating this behavior to emcc
  12 invocations directly.
  13
  14 Important note: with non-nix clang, sysroot/include dir ends up being the last
  15 in the include search order, right after the resource root.
  16 Hence usage of -idirafter. Clang also documents an -isystem-after flag
  17 but it doesn't appear to work
  18 ---
  19  emcc.py | 7 ++++++-
  20  1 file changed, 6 insertions(+), 1 deletion(-)
  21
  22 diff --git a/emcc.py b/emcc.py
  23 index ba8d1b556..7d89644c5 100755
  24 --- a/emcc.py
  25 +++ b/emcc.py
  26 @@ -883,7 +883,12 @@ def parse_s_args(args):
  27
  28
  29  def emsdk_cflags(user_args):
  30 -  cflags = ['--sysroot=' + cache.get_sysroot(absolute=True)]
  31 +  cflags = [
  32 +    '--sysroot=' + cache.get_sysroot(absolute=True),
  33 +    '-resource-dir=@resourceDir@',
  34 +    '-idirafter' + cache.get_sysroot(absolute=True) + os.path.join('/include'),
  35 +    '-iwithsysroot' + os.path.join('/include','c++','v1')
  36 +  ]
  37
  38    def array_contains_any_of(hay, needles):
  39      for n in needles:
  40 --
  41 2.40.0
  42