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| author | Emilio Cobos Álvarez <emilio@crisal.io> | 2019-11-12 19:18:32 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-11-21 17:54:16 +0100 |
| commit | bfa864e1645e140da2e1aae3cf0d0ba0674f6eb5 (patch) | |
| tree | 90e6be87b502b09bf30cb6f902f1b0ebab6830e0 | |
| parent | 854e91bf6b4221f424ffa13b9ef50f35623b7b74 (diff) | |
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Don't use a custom wrapper macro around __has_include (bug 25189).
This causes issues when using clang with -frewrite-includes to e.g.,
submit the translation unit to a distributed compiler.
In my case, I was building Firefox using sccache.
See [1] for a reduced test-case since I initially thought this was a
clang bug, and [2] for more context.
Apparently doing this is invalid C++ per [cpp.cond], which mentions [3]:
> The #ifdef and #ifndef directives, and the defined conditional
> inclusion operator, shall treat __has_include and __has_cpp_attribute
> as if they were the names of defined macros. The identifiers
> __has_include and __has_cpp_attribute shall not appear in any context
> not mentioned in this subclause.
[1]: https://bugs.llvm.org/show_bug.cgi?id=43982
[2]: https://bugs.llvm.org/show_bug.cgi?id=37990
[3]: http://eel.is/c++draft/cpp.cond#7.sentence-2
Change-Id: Id4b8ee19176a9e4624b533087ba870c418f27e60
| -rw-r--r-- | misc/sys/cdefs.h | 8 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/statx.h | 12 |
2 files changed, 7 insertions, 13 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h index abcb0d5e3c..467dbd9547 100644 --- a/misc/sys/cdefs.h +++ b/misc/sys/cdefs.h @@ -412,14 +412,6 @@ # define __glibc_has_attribute(attr) 0 #endif -#ifdef __has_include -/* Do not use a function-like macro, so that __has_include can inhibit - macro expansion. */ -# define __glibc_has_include __has_include -#else -# define __glibc_has_include(header) 0 -#endif - #if (!defined _Noreturn \ && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ && !__GNUC_PREREQ (4,7)) diff --git a/sysdeps/unix/sysv/linux/bits/statx.h b/sysdeps/unix/sysv/linux/bits/statx.h index ff3f2e8973..2015c8262e 100644 --- a/sysdeps/unix/sysv/linux/bits/statx.h +++ b/sysdeps/unix/sysv/linux/bits/statx.h @@ -26,11 +26,13 @@ /* Use "" to work around incorrect macro expansion of the __has_include argument (GCC PR 80005). */ -#if __glibc_has_include ("linux/stat.h") -# include "linux/stat.h" -# ifdef STATX_TYPE -# define __statx_timestamp_defined 1 -# define __statx_defined 1 +#ifdef __has_include +# if __has_include ("linux/stat.h") +# include "linux/stat.h" +# ifdef STATX_TYPE +# define __statx_timestamp_defined 1 +# define __statx_defined 1 +# endif # endif #endif |