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Continuing the fixes for linknamespace and localplt test failures with -Os that arise from functions not being inlined in that case, this patch fixes such failures for putc_unlocked and fputc_unlocked. libc_hidden_* are used for both functions, while namespace issues are addressed by making putc_unlocked a weak alias of hidden __putc_unlocked, which is called in the one place where namespace issues arise (and defined as an inline function in include/stdio.h). Tested for x86_64 (both without -Os to make sure that case continues to work, and with -Os to make sure all the relevant linknamespace and localplt test failures are resolved). This completes fixing the -Os linknamespace failures (at least for x86_64); localplt failures remain after this patch. 2018-02-19 Joseph Myers <joseph@codesourcery.com> [BZ #15105] [BZ #19463] * libio/fputc_u.c (fputc_unlocked): Use libc_hidden_def. * libio/putc_u.c (putc_unlocked): Rename to __putc_unlocked and define as weak alias of __putc_unlocked. Use libc_hidden_weak. * include/stdio.h [!_ISOMAC] (fputc_unlocked): Use libc_hidden_proto. [!_ISOMAC] (putc_unlocked): Likewise. [!_ISOMAC] (__putc_unlocked): Declare as hidden function, and define inline if [__USE_EXTERN_INLINES]. * misc/syslog.c (__vsyslog_chk): Call __putc_unlocked instead of putc_unlocked.
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