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670993a89d
The fast_float dependency required C++ (libstdc++) to build Redis. This commit replaces the 3800-line C++ template library with a minimal pure C implementation (~360 lines) that provides the same functionality needed by Redis. This is **very important** because Redis build process would fail without g++ installed, a common situation in Linux distributions even after installing the basic build tools: we want the build process of Redis to be the simplest possible. Also Redis sometimes is compiled in embedded systems lacking the g++ toolchain. There is no reason to depend on C++ in a project written in C. ## The C implementation uses 1. Fast path (Clinger's algorithm) for numbers with mantissa <= 2^53 and exponent in [-22, 22], covering ~99% of real-world cases. 2. Fallback to strtod() for complex cases to ensure correctly-rounded results. ## Changes - Move new fast_float_strtod.c(C implementation) from deps into Redis core since it is now a single file and no longer needs a separate directory. - Remove all c++ dependencies The implementation was tested against both strtod and the original C++ implementation with 10,000+ test cases including edge cases, special values (inf/nan), and random inputs. --------- Co-authored-by: debing.sun <debing.sun@redis.com> Co-authored-by: Mincho Paskalev <minchopaskal@gmail.com> Co-authored-by: Moti Cohen <moti.cohen@redis.com>