Comment #2 on issue 1225 by [email protected]: src/runtime.cc:3951:5:
error: comparison always false due to limited range of data type
http://code.google.com/p/v8/issues/detail?id=1225
I am experiencing the same issue with GCC 4.5.1
It is not actually an error but a warning, and it only appears when you
compile with --O2 or -O3 optimization levels.
The line which seems to be causing the warning is the following one:
strict_mode = static_cast<StrictModeFlag>(strict_unchecked);
If I replace it by:
strict_mode = strict_unchecked == kStrictMode ? kStrictMode :
kNonStrictMode;
the compiler doesn't complain.
The static cast seems to be causing, under the mentioned optimization
levels, a type inference that somehow converts strict_unchecked into an
StrictModeFlag enum, and warns that the value of the condition in:
RUNTIME_ASSERT(strict_unchecked == kStrictMode ||
strict_unchecked == kNonStrictMode);
is always true.
I guess this is related with some optimizations that were added to gcc in
the 4.5 version: http://gcc.gnu.org/gcc-4.5/changes.html
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