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Real-world C compilers diverge from standard C in everyday cases

sebsite.pw 4 min read Editor score 6/10

The piece catalogs gaps between standard C and GCC/Clang with common C libraries, including the default treatment of `asm` and `FLT_ROUNDS`. Engineers maintaining portable C need to account for the behavior of actual toolchains, not just the standard.

What

The excerpt lists cases where GCC, Clang, glibc, or musl behavior differs from C or POSIX requirements.

How

Examples include GCC treating standard C pragmas as no-ops and glibc’s initstate failing to return NULL on error.

Why it matters

Engineers targeting multiple compilers and libraries must account for real-world behavior, not just standard guarantees.

Read on sebsite.pw → Lobsters · 2 comments

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