Remove excess calls to gdb_flush

A customer noticed some mildly odd MI output, where CLI output was
split into multiple MI strings at unusual boundaries, like this:

    ~"$1 = (b => true"
    ~", p => 0x407260"

This is technically correct according to the MI spec, but still
unusual, in that there's no particular reason for the string to be
split where it is.

I tracked this down to a call to gdb_flush in generic_val_print.
Then, I went through all calls to gdb_flush and removed the ones I
thought were superfluous.  In particular:

* Any call in the value-printing code;
* Likewise the type-printing code (just a single call); and
* Any call that immediately followed a printf that obviously
  ended with a newline, my belief being that gdb's standard output
  streams are line buffered (by inheriting the behavior from stdio)

Regression tested on x86-64 Fedora 29.

I didn't add a new test case.  I tend to think we don't necessarily
want to specify this behavior in the tests.  Let me know what you
think of this.

gdb/ChangeLog
2019-03-05  Tom Tromey  <tromey@adacore.com>

	* windows-nat.c (windows_nat_target::attach)
	(windows_nat_target::detach): Don't call gdb_flush.
	* valprint.c (generic_val_print, val_print, val_print_string):
	Don't call gdb_flush.
	* utils.c (defaulted_query): Don't call gdb_flush.
	* typeprint.c (print_type_scalar): Don't call gdb_flush.
	* target.c (target_announce_detach): Don't call gdb_flush.
	* sparc64-tdep.c (adi_print_versions): Don't call gdb_flush.
	* remote.c (extended_remote_target::attach): Don't call
	gdb_flush.
	* procfs.c (procfs_target::detach): Don't call gdb_flush.
	* printcmd.c (do_examine): Don't call gdb_flush.
	(info_display_command): Don't call gdb_flush.
	* p-valprint.c (pascal_val_print): Don't call gdb_flush.
	* nto-procfs.c (nto_procfs_target::attach): Don't call gdb_flush.
	* memattr.c (info_mem_command): Don't call gdb_flush.
	* mdebugread.c (mdebug_build_psymtabs): Don't call gdb_flush.
	* m2-valprint.c (m2_val_print): Don't call gdb_flush.
	* infrun.c (follow_exec, handle_command): Don't call gdb_flush.
	* inf-ptrace.c (inf_ptrace_target::attach): Don't call gdb_flush.
	* hppa-tdep.c (unwind_command): Don't call gdb_flush.
	* gnu-nat.c (gnu_nat_target::attach): Don't call gdb_flush.
	(gnu_nat_target::detach): Don't call gdb_flush.
	* f-valprint.c (f_val_print): Don't call gdb_flush.
	* darwin-nat.c (darwin_nat_target::attach): Don't call gdb_flush.
	* cli/cli-script.c (read_command_lines): Don't call gdb_flush.
	* cli/cli-cmds.c (shell_escape, print_disassembly): Don't call
	gdb_flush.
	* c-valprint.c (c_val_print): Don't call gdb_flush.
	* ada-valprint.c (ada_print_scalar): Don't call gdb_flush.

2 files changed, 4 insertions, 15 deletions

diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index fa99503..5dc94a5 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -709,16 +709,10 @@ shell_escape (const char *arg, int from_tty)
     arg = "inferior shell";
 
   if (rc == -1)
-    {
-      fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", arg,
-			  safe_strerror (errno));
-      gdb_flush (gdb_stderr);
-    }
+    fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", arg,
+			safe_strerror (errno));
   else if (rc)
-    {
-      fprintf_unfiltered (gdb_stderr, "%s exited with status %d\n", arg, rc);
-      gdb_flush (gdb_stderr);
-    }
+    fprintf_unfiltered (gdb_stderr, "%s exited with status %d\n", arg, rc);
 #ifdef GLOBAL_CURDIR
   /* Make sure to return to the directory GDB thinks it is, in case
      the shell command we just ran changed it.  */
@@ -743,7 +737,6 @@ shell_escape (const char *arg, int from_tty)
 
       fprintf_unfiltered (gdb_stderr, "Cannot execute %s: %s\n", user_shell,
 			  safe_strerror (errno));
-      gdb_flush (gdb_stderr);
       _exit (0177);
     }
 
@@ -1130,7 +1123,6 @@ print_disassembly (struct gdbarch *gdbarch, const char *name,
 	    }
 	}
       printf_filtered ("End of assembler dump.\n");
-      gdb_flush (gdb_stdout);
     }
 #if defined(TUI)
   else
diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index 85f00c7..e2fa880 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -1186,10 +1186,7 @@ read_command_lines (const char *prompt_arg, int from_tty, int parse_commands,
 					     END_MESSAGE);
 	}
       else
-	{
-	  printf_unfiltered ("%s\n%s\n", prompt_arg, END_MESSAGE);
-	  gdb_flush (gdb_stdout);
-	}
+	printf_unfiltered ("%s\n%s\n", prompt_arg, END_MESSAGE);
     }