Bug 23344 – std.stdio: error: undefined identifier fputc_unlocked

CRuntime_uClibc is marked as a GCC_IO platform in std.stdio. https://github.com/dlang/phobos/blob/92a9d600d1c03f9ac35174dc3fd01a5d7a259c38/std/stdio.d#L86-L90 GCC_IO assumes that fputc_* and fgetc_unlocked are declared. https://github.com/dlang/phobos/blob/92a9d600d1c03f9ac35174dc3fd01a5d7a259c38/std/stdio.d#L245-L252 This function is only declared for CRuntime_Glibc https://github.com/dlang/dmd/blob/0e8e40fbd05323342d082541e455eb3210917a62/druntime/src/core/stdc/stdio.d#L1563-L1598 And for good reason, uClibc is by default built to expose these functions as macros. https://github.com/kraj/uClibc/blob/ca1c74d67dd115d059a875150e10b8560a9c35a8/extra/Configs/Config.in#L1772-L1788 Which do not exist in druntime bindings https://github.com/dlang/dmd/blob/0e8e40fbd05323342d082541e455eb3210917a62/druntime/src/core/stdc/stdio.d#L1873-L1896

@ibuclaw created dlang/phobos pull request #8571 "partial fix for Issue 23344 - std.stdio: error: undefined identifier fputc_unlocked" mentioning this issue: - partial fix for Issue 23344 - std.stdio: error: undefined identifier fputc_unlocked While the proper fix would be to define the missing getc/putc macros, for now to keep the build happy, just treat uClibc as a GENERIC_IO platform. https://github.com/dlang/phobos/pull/8571

Patch posted to fix immediate build error, real fix would be to add the missing macros to druntime, then we can re-enable GCC_IO again.

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