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author | Nick Desaulniers <ndesaulniers@google.com> | 2018-08-23 02:37:24 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-23 03:31:34 +0300 |
commit | 815f0ddb346c196018d4d8f8f55c12b83da1de3f (patch) | |
tree | 4805bf7e3cb7ec4e727aba8e62f9211e9001a760 /drivers/watchdog/atlas7_wdt.c | |
parent | 899fbc33fd775b9dfa363db28f322272920a2196 (diff) | |
download | linux-815f0ddb346c196018d4d8f8f55c12b83da1de3f.tar.xz |
include/linux/compiler*.h: make compiler-*.h mutually exclusive
Commit cafa0010cd51 ("Raise the minimum required gcc version to 4.6")
recently exposed a brittle part of the build for supporting non-gcc
compilers.
Both Clang and ICC define __GNUC__, __GNUC_MINOR__, and
__GNUC_PATCHLEVEL__ for quick compatibility with code bases that haven't
added compiler specific checks for __clang__ or __INTEL_COMPILER.
This is brittle, as they happened to get compatibility by posing as a
certain version of GCC. This broke when upgrading the minimal version
of GCC required to build the kernel, to a version above what ICC and
Clang claim to be.
Rather than always including compiler-gcc.h then undefining or
redefining macros in compiler-intel.h or compiler-clang.h, let's
separate out the compiler specific macro definitions into mutually
exclusive headers, do more proper compiler detection, and keep shared
definitions in compiler_types.h.
Fixes: cafa0010cd51 ("Raise the minimum required gcc version to 4.6")
Reported-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Suggested-by: Eli Friedman <efriedma@codeaurora.org>
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/watchdog/atlas7_wdt.c')
0 files changed, 0 insertions, 0 deletions