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

   1 From 86fc9ce2b381748813b372f7e86909be6f955cbd 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 | 3 +++
  20  1 file changed, 3 insertions(+)
  21
  22 diff --git a/emcc.py b/emcc.py
  23 index 279f6d4d9..26e20e2cc 100644
  24 --- a/emcc.py
  25 +++ b/emcc.py
  26 @@ -400,6 +400,9 @@ def get_cflags(user_args, is_cxx):
  27    # We add these to the user's flags (newargs), but not when building .s or .S assembly files
  28    cflags = get_clang_flags(user_args)
  29    cflags.append('--sysroot=' + cache.get_sysroot(absolute=True))
  30 +  cflags.append('-resource-dir=@resourceDir@')
  31 +  cflags.append('-idirafter' + cache.get_sysroot(absolute=True) + os.path.join('/include'))
  32 +  cflags.append('-iwithsysroot' + os.path.join('/include','c++','v1'))
  33
  34    if settings.EMSCRIPTEN_TRACING:
  35      cflags.append('-D__EMSCRIPTEN_TRACING__=1')
  36 --
  37 2.42.0
  38