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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-7-7/clang/lib/Headers/inttypes.h
===================================================================
--- llvm-toolchain-7-7.orig/clang/lib/Headers/inttypes.h
+++ llvm-toolchain-7-7/clang/lib/Headers/inttypes.h
@@ -20,7 +20,7 @@
*
\*===----------------------------------------------------------------------===*/
-#ifndef __CLANG_INTTYPES_H
+#if !defined(__CLANG_INTTYPES_H) || !defined(_INTTYPES_H)
#define __CLANG_INTTYPES_H
#if defined(_MSC_VER) && _MSC_VER < 1800
Index: llvm-toolchain-7-7/clang/lib/Headers/limits.h
===================================================================
--- llvm-toolchain-7-7.orig/clang/lib/Headers/limits.h
+++ llvm-toolchain-7-7/clang/lib/Headers/limits.h
@@ -22,7 +22,7 @@
*
\*===----------------------------------------------------------------------===*/
-#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.
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