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libbacktrace: update README

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Ian Lance Taylor 11 months ago
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      README.md

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README.md

@ -10,6 +10,8 @@ The libbacktrace library may be linked into a program or library and
used to produce symbolic backtraces.
Sample uses would be to print a detailed backtrace when an error
occurs or to gather detailed profiling information.
In general the functions provided by this library are async-signal-safe,
meaning that they may be safely called from a signal handler.
The libbacktrace library is provided under a BSD license.
See the source files for the exact license text.
@ -23,11 +25,12 @@ will work.
See the source file backtrace-supported.h.in for the macros that it
defines.
As of January 2018, libbacktrace only supports ELF, PE/COFF, and XCOFF
executables with DWARF debugging information.
As of October 2020, libbacktrace supports ELF, PE/COFF, Mach-O, and
XCOFF executables with DWARF debugging information.
In other words, it supports GNU/Linux, *BSD, macOS, Windows, and AIX.
The library is written to make it straightforward to add support for
other object file and debugging formats.
The library relies on the C++ unwind API defined at
https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
This API is provided by GCC.
This API is provided by GCC and clang.
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