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[BOLT][docs] Add note regarding DWARF v5 support to README.md

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Reviewed By: Amir, yota9

Differential Revision: https://reviews.llvm.org/D118284
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Maksim Panchenko 2022-01-26 13:52:40 -08:00
parent 50f50f2582
commit d97fcf3df2
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@ -30,6 +30,14 @@ compiler option. Since GCC8 enables this option by default, you have to
explicitly disable it by adding `-fno-reorder-blocks-and-partition` flag if
you are compiling with GCC8 or above.
NOTE2: DWARF v5 is the new debugging format generated by the latest LLVM and GCC
compilers. It offers several benefits over the previous DWARF v4. Currently, the
support for v5 is a work in progress for BOLT. While you will be able to
optimize binaries produced by the latest compilers, until the support is
complete, you will not be able to update the debug info with
`-update-debug-sections`. To temporarily work around the issue, we recommend
compiling binaries with `-gdwarf-4` option that forces DWARF v4 output.
PIE and .so support has been added recently. Please report bugs if you
encounter any issues.