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Janne Blomqvist edaaef601d Use vectored writes when reporting errors and warnings. 
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
 		2018-09-21 21:12:59 +03:00
..
backtrace.c Use vectored writes when reporting errors and warnings. 2018-09-21 21:12:59 +03:00
bounds.c Use pointer sized array indices. 2018-01-31 16:16:22 +02:00
compile_options.c Update copyright years. 2018-01-03 11:03:58 +01:00
convert_char.c Update copyright years. 2018-01-03 11:03:58 +01:00
environ.c Remove unused init_unsigned_integer function. 2018-09-07 21:59:50 +03:00
error.c Use vectored writes when reporting errors and warnings. 2018-09-21 21:12:59 +03:00
fpu.c Update copyright years. 2018-01-03 11:03:58 +01:00
in_pack_generic.c Use pointer sized array indices. 2018-01-31 16:16:22 +02:00
in_unpack_generic.c Use pointer sized array indices. 2018-01-31 16:16:22 +02:00
main.c Update copyright years. 2018-01-03 11:03:58 +01:00
memory.c Update copyright years. 2018-01-03 11:03:58 +01:00
minimal.c Fix interleaving of Fortran STOP messages 2018-09-12 13:53:34 +00:00
pause.c Use vectored writes when reporting errors and warnings. 2018-09-21 21:12:59 +03:00
select.c Update copyright years. 2018-01-03 11:03:58 +01:00
select_inc.c Update copyright years. 2018-01-03 11:03:58 +01:00
stop.c Use vectored writes when reporting errors and warnings. 2018-09-21 21:12:59 +03:00
string.c Update copyright years. 2018-01-03 11:03:58 +01:00