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