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commit bfa864e1645e140da2e1aae3cf0d0ba0674f6eb5
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Author: Emilio Cobos Álvarez <emilio@crisal.io>
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Date: Tue Nov 12 19:18:32 2019 +0100
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Don't use a custom wrapper macro around __has_include (bug 25189).
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This causes issues when using clang with -frewrite-includes to e.g.,
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submit the translation unit to a distributed compiler.
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In my case, I was building Firefox using sccache.
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See [1] for a reduced test-case since I initially thought this was a
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clang bug, and [2] for more context.
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Apparently doing this is invalid C++ per [cpp.cond], which mentions [3]:
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> The #ifdef and #ifndef directives, and the defined conditional
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> inclusion operator, shall treat __has_include and __has_cpp_attribute
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> as if they were the names of defined macros. The identifiers
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> __has_include and __has_cpp_attribute shall not appear in any context
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> not mentioned in this subclause.
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[1]: https://bugs.llvm.org/show_bug.cgi?id=43982
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[2]: https://bugs.llvm.org/show_bug.cgi?id=37990
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[3]: http://eel.is/c++draft/cpp.cond#7.sentence-2
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Change-Id: Id4b8ee19176a9e4624b533087ba870c418f27e60
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diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
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index 9e840e602f815d86..3f6fe3cc8563b493 100644
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--- a/misc/sys/cdefs.h
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+++ b/misc/sys/cdefs.h
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@@ -412,14 +412,6 @@
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# define __glibc_has_attribute(attr) 0
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#endif
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-#ifdef __has_include
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-/* Do not use a function-like macro, so that __has_include can inhibit
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- macro expansion. */
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-# define __glibc_has_include __has_include
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-#else
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-# define __glibc_has_include(header) 0
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-#endif
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-
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#if (!defined _Noreturn \
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&& (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
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&& !__GNUC_PREREQ (4,7))
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diff --git a/sysdeps/unix/sysv/linux/bits/statx.h b/sysdeps/unix/sysv/linux/bits/statx.h
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index 206878723fd37881..aaccfdc2dc03a1dc 100644
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--- a/sysdeps/unix/sysv/linux/bits/statx.h
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+++ b/sysdeps/unix/sysv/linux/bits/statx.h
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@@ -26,11 +26,13 @@
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/* Use "" to work around incorrect macro expansion of the
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__has_include argument (GCC PR 80005). */
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-#if __glibc_has_include ("linux/stat.h")
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-# include "linux/stat.h"
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-# ifdef STATX_TYPE
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-# define __statx_timestamp_defined 1
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-# define __statx_defined 1
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+#ifdef __has_include
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+# if __has_include ("linux/stat.h")
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+# include "linux/stat.h"
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+# ifdef STATX_TYPE
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+# define __statx_timestamp_defined 1
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+# define __statx_defined 1
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+# endif
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# endif
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#endif
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