Bring back bootstrap-fix-include-next.diff which has been removed from an unknow reason

debian/changelog

@@ -10,6 +10,8 @@ llvm-toolchain-snapshot (1:9~svn365742-1~exp1) experimental; urgency=medium
     - __kmpc_taskred_modifier_init
     - omp_fulfill_event
     - omp_fulfill_event_
+  * Bring back  bootstrap-fix-include-next.diff which has been removed from
+    an unknow reason
 
  -- Sylvestre Ledru <sylvestre@debian.org>  Thu, 11 Jul 2019 11:11:46 +0200
 

debian/patches/bootstrap-fix-include-next.diff

@@ -0,0 +1,41 @@
+When doing a bootstrap, we use a newly built clang.
+When this one is used, if already installed on the system,
+we have clang header in two places:
+llvm-toolchain-7-7/build-llvm/lib/clang/7.0.0/include/inttypes.h
+and
+/usr/include/clang/7.0.0/include/inttypes.h
+
+Because clang expects only one of his headers to be available, it uses
+include_next to get the glibc (libc6-dev package) header.
+
+However, in the previous example, because we have inttypes.h twice in the
+include search path, clang's header will call itself without any effect.
+Therefore, it will do include_next until the define from the libc is existing (ex: _INTTYPES_H)
+
+
+Index: llvm-toolchain-snapshot_9~svn365742/clang/lib/Headers/inttypes.h
+===================================================================
+--- llvm-toolchain-snapshot_9~svn365742.orig/clang/lib/Headers/inttypes.h
++++ llvm-toolchain-snapshot_9~svn365742/clang/lib/Headers/inttypes.h
+@@ -6,7 +6,7 @@
+  *
+ \*===----------------------------------------------------------------------===*/
+ 
+-#ifndef __CLANG_INTTYPES_H
++#if !defined(__CLANG_INTTYPES_H) || !defined(_INTTYPES_H)
+ // AIX system headers need inttypes.h to be re-enterable while _STD_TYPES_T
+ // is defined until an inclusion of it without _STD_TYPES_T occurs, in which
+ // case the header guard macro is defined.
+Index: llvm-toolchain-snapshot_9~svn365742/clang/lib/Headers/limits.h
+===================================================================
+--- llvm-toolchain-snapshot_9~svn365742.orig/clang/lib/Headers/limits.h
++++ llvm-toolchain-snapshot_9~svn365742/clang/lib/Headers/limits.h
+@@ -6,7 +6,7 @@
+  *
+ \*===----------------------------------------------------------------------===*/
+ 
+-#ifndef __CLANG_LIMITS_H
++#if !defined(__CLANG_LIMITS_H) || !defined(_LIBC_LIMITS_H_)
+ #define __CLANG_LIMITS_H
+ 
+ /* The system's limits.h may, in turn, try to #include_next GCC's limits.h.

debian/patches/series

@@ -123,3 +123,4 @@ kfreebsd/lldb_source_Plugins_Process_FreeBSD.diff
 kfreebsd/tools_llvm-shlib_CMakeLists.txt.diff
 
 930008-arm.diff
+bootstrap-fix-include-next.diff