Hi all,
After merging the mm tree, today's linux-next build (native perf) failed
like this:
In file included from tools/include/linux/bits.h:21,
from tools/include/linux/bitops.h:14,
from tools/include/linux/bitmap.h:6,
from tools/perf/util/header.h:10,
from /home/sfr/next/perf/pmu-events/pmu-events.c:3:
tools/include/linux/find.h: In function 'find_next_bit':
tools/include/linux/bits.h:24:17: error: implicit declaration of function '__is_constexpr' [-Werror=implicit-function-declaration]
24 | __is_constexpr((l) > (h)), (l) > (h), 0)))
| ^~~~~~~~~~~~~~
tools/include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
tools/include/linux/bits.h:37:10: note: in expansion of macro 'GENMASK_INPUT_CHECK'
37 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
| ^~~~~~~~~~~~~~~~~~~
tools/include/linux/find.h:42:31: note: in expansion of macro 'GENMASK'
42 | val = *addr & GENMASK(size - 1, offset);
| ^~~~~~~
tools/include/linux/bits.h:23:28: error: first argument to '__builtin_choose_expr' not a constant
23 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
| ^~~~~~~~~~~~~~~~~~~~~
tools/include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
tools/include/linux/bits.h:37:10: note: in expansion of macro 'GENMASK_INPUT_CHECK'
37 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
| ^~~~~~~~~~~~~~~~~~~
tools/include/linux/find.h:42:31: note: in expansion of macro 'GENMASK'
42 | val = *addr & GENMASK(size - 1, offset);
| ^~~~~~~
... and much more ...
Caused by commit
5bee02eadb5d ("compiler.h: move __is_constexpr() to compiler.h")
I have reverted that commit for today.
--
Cheers,
Stephen Rothwell
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