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Both building R and installing packages use the C compiler in C23 mode.
‘quantile()’'s default method gets an option ‘fuzz’ to protect against floating point inaccuracy before rounding, thus fixing PR#15811 and, en passant, PR#17683.
R can be installed using C23 (for example with ‘-std=gnu23’ or ‘-std=gnu2x’) with recent compilers including ‘gcc’ 12-14, Apple ‘clang’ 15-16, LLVM ‘clang’ 17-20 and Intel ‘icx’ 2024.2.
It can be installed with the upcoming (at the time of writing) ‘gcc’ 15, which defaults to C23.