Janne Blomqvist
edaaef601d
When producing error and warning messages, libgfortran writes a message by using many system calls. By using vectored writes (the POSIX writev function) when available and feasible to use without major surgery, we reduce the chance that output gets intermingled with other output to stderr. In practice, this is done by introducing a new function estr_writev in addition to the existing estr_write. In order to use this, the old st_vprintf is removed, replaced by direct calls of vsnprintf, allowing more message batching. Regtested on x86_64-pc-linux-gnu. libgfortran/ChangeLog: 2018-09-21 Janne Blomqvist <jb@gcc.gnu.org> * config.h.in: Regenerated. * configure: Regenerated. * configure.ac: Check for writev and sys/uio.h. * libgfortran.h: Include sys/uio.h. (st_vprintf): Remove prototype. (struct iovec): Define if not available. (estr_writev): New prototype. * runtime/backtrace.c (error_callback): Use estr_writev. * runtime/error.c (ST_VPRINTF_SIZE): Remove. (estr_writev): New function. (st_vprintf): Remove. (gf_vsnprintf): New function. (ST_ERRBUF_SIZE): New macro. (st_printf): Use vsnprintf. (os_error): Use estr_writev. (runtime_error): Use vsnprintf and estr_writev. (runtime_error_at): Likewise. (runtime_warning_at): Likewise. (internal_error): Use estr_writev. (generate_error_common): Likewise. (generate_warning): Likewise. (notify_std): Likewise. * runtime/pause.c (pause_string): Likewise. * runtime/stop.c (report_exception): Likewise. (stop_string): Likewise. (error_stop_string): Likewise. From-SVN: r264487
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