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unknown user pushed a change to branch master in repository gcc.

from 6cb61e50ade Enable -Wuninitialized + -ftrivial-auto-var-init for addres [...] new cc3bf3404e4 libstdc++: Directly implement hexfloat std::from_chars for [...] new 2800bc08e4a libstdc++: Import the fast_float library new f5c8b82512f libstdc++: Apply modifications to our local copy of fast_float new 40b0d4472a2 libstdc++: Adjust fast_float's over/underflow behavior for [...] new 490e23032ba libstdc++: Use fast_float in std::from_chars for binary32/64

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Summary of changes: libstdc++-v3/src/c++17/fast_float/LOCAL_PATCHES | 2 + .../src/c++17/fast_float}/MERGE | 2 +- libstdc++-v3/src/c++17/fast_float/README.md | 218 ++ libstdc++-v3/src/c++17/fast_float/fast_float.h | 2903 ++++++++++++++++++++ libstdc++-v3/src/c++17/floating_from_chars.cc | 397 +++ libstdc++-v3/testsuite/20_util/from_chars/7.cc | 152 + 6 files changed, 3673 insertions(+), 1 deletion(-) create mode 100644 libstdc++-v3/src/c++17/fast_float/LOCAL_PATCHES copy {libsanitizer => libstdc++-v3/src/c++17/fast_float}/MERGE (73%) create mode 100644 libstdc++-v3/src/c++17/fast_float/README.md create mode 100644 libstdc++-v3/src/c++17/fast_float/fast_float.h create mode 100644 libstdc++-v3/testsuite/20_util/from_chars/7.cc