Akin the `py_binary` rules for `lit`, these are scoped to binaries,
rather than exposing the library - binary split. The latter is available
to the package (pip package) users.
Tested:
```
cd utils/bazel
bazel build @llvm-project//llvm:extract_ir
bazel-bin/external/llvm-project/llvm/extract_ir --help
```
...and observed expected output (rather than import not found errors)
(Same for the other 2 targets).
In Bazel, Clang current separates the clang executable into a
clang-driver library, and the actual clang executable. This allows
downstream users to make their own variations of clang, without having
to redo/maintain separate build pipelines.
This adds the same for opt for both CMake and Bazel.
Usage of uninitialized memory is a top memory safety issue in C++ codebases.
Help mitigate this somewhat by default initialize stack allocations to a
pattern (0xAA repeating).
Clang has received optimizations to sink these into control flow paths that
access such values to minimize the overhead of these added initializations.
If there's a measurable slowdown, we can add
-ftrivial-auto-var-init-max-size=<N> for some value N bytes if we have any
large stack allocations, or add attribute uninitialized to any variable
declarations.
Unsupported until GCC 12.1 / Clang 8.
Increases file size of libc.a from a full build by +8.79Ki (+0.2%).
GCC complains about "type qualifiers ignored on cast result type".
Upon investigation the correct fix was to remove all `volatile` and use the `-frounding-math` option.
As of the Bazel 6.x series, there is no difference between the
`exec_tools` and `tools`. Bazel 7 removes the `exec_tools` attribute
entirely. This commit updates to use the cannonical attribute name to
allow building `clang-tidy``with bazel 7.0.0, though it does not change
the default bazel version which remains at 6.1.2.
See also https://github.com/bazelbuild/bazel/issues/19132 for more
information.
This patch removes the `FPBits` specialization for x86 Extended Precision by moving it up to `FPRep`.
It also introduces enums (`Exponent`, `BiasedExponent` and `Significand`) to represent the exponent and significant parts of the floating point numbers. These enums are used to construct and observe floating point representations.
Additionally, we remove `LongDoubleBits.h` that is now unnecessary.
