[RFA,v2,08/24] Remove an unlink cleanup

  compile/compile.c had its own cleanup to unlink a file.  This patch
replaces this cleanup with gdb::unlinker.

ChangeLog
2017-07-25  Tom Tromey  <tom@tromey.com>

	* compile/compile.c (cleanup_unlink_file): Remove.
	(compile_to_object): Use gdb::unlinker.
	(eval_compile_command): Likewise.
---
 gdb/ChangeLog         |  6 ++++++
 gdb/compile/compile.c | 38 +++++++++++++++++++-------------------
 2 files changed, 25 insertions(+), 19 deletions(-)
  

On 2017-07-25 19:20, Tom Tromey wrote:
> compile/compile.c had its own cleanup to unlink a file.  This patch
> replaces this cleanup with gdb::unlinker.
> 
> ChangeLog
> 2017-07-25  Tom Tromey  <tom@tromey.com>
> 
> 	* compile/compile.c (cleanup_unlink_file): Remove.
> 	(compile_to_object): Use gdb::unlinker.
> 	(eval_compile_command): Likewise.
> ---
>  gdb/ChangeLog         |  6 ++++++
>  gdb/compile/compile.c | 38 +++++++++++++++++++-------------------
>  2 files changed, 25 insertions(+), 19 deletions(-)
> 
> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> index 9d46731..2bf549b 100644
> --- a/gdb/ChangeLog
> +++ b/gdb/ChangeLog
> @@ -1,5 +1,11 @@
>  2017-07-25  Tom Tromey  <tom@tromey.com>
> 
> +	* compile/compile.c (cleanup_unlink_file): Remove.
> +	(compile_to_object): Use gdb::unlinker.
> +	(eval_compile_command): Likewise.
> +
> +2017-07-25  Tom Tromey  <tom@tromey.com>
> +
>  	* utils.h (make_cleanup_fclose): Remove.
>  	* utils.c (do_fclose_cleanup, make_cleanup_fclose): Remove.
> 
> diff --git a/gdb/compile/compile.c b/gdb/compile/compile.c
> index d8c505f..5269aaf 100644
> --- a/gdb/compile/compile.c
> +++ b/gdb/compile/compile.c
> @@ -39,6 +39,8 @@
>  #include "osabi.h"
>  #include "gdb_wait.h"
>  #include "valprint.h"
> +#include "common/gdb_optional.h"
> +#include "common/gdb_unlinker.h"
> 
>  
> 
> @@ -427,16 +429,6 @@ cleanup_compile_instance (void *arg)
>    inst->destroy (inst);
>  }
> 
> -/* A cleanup function to unlink a file.  */
> -
> -static void
> -cleanup_unlink_file (void *arg)
> -{
> -  const char *filename = (const char *) arg;
> -
> -  unlink (filename);
> -}
> -
>  /* A helper function suitable for use as the "print_callback" in the
>     compiler object.  */
> 
> @@ -455,7 +447,7 @@ compile_to_object (struct command_line *cmd, const
> char *cmd_string,
>  		   enum compile_i_scope_types scope)
>  {
>    struct compile_instance *compiler;
> -  struct cleanup *cleanup, *inner_cleanup;
> +  struct cleanup *cleanup;
>    const struct block *expr_block;
>    CORE_ADDR trash_pc, expr_pc;
>    int argc;
> @@ -547,12 +539,15 @@ compile_to_object (struct command_line *cmd,
> const char *cmd_string,
> 
>    compile_file_names fnames = get_new_file_names ();
> 
> +  gdb::optional<gdb::unlinker> source_remover;
> +
>    {
>      gdb_file_up src = gdb_fopen_cloexec (fnames.source_file (), "w");
>      if (src == NULL)
>        perror_with_name (_("Could not open source file for writing"));
> -    inner_cleanup = make_cleanup (cleanup_unlink_file,
> -				  (void *) fnames.source_file ());
> +
> +    source_remover.emplace (fnames.source_file ());
> +
>      if (fputs (code.c_str (), src.get ()) == EOF)
>        perror_with_name (_("Could not write to source file"));
>    }
> @@ -572,7 +567,9 @@ compile_to_object (struct command_line *cmd, const
> char *cmd_string,
>      fprintf_unfiltered (gdb_stdlog, "object file produced: %s\n\n",
>  			fnames.object_file ());
> 
> -  discard_cleanups (inner_cleanup);
> +  /* Keep the source file.  */
> +  source_remover->keep ();
> +
>    do_cleanups (cleanup);
> 
>    return fnames;
> @@ -594,14 +591,13 @@ void
>  eval_compile_command (struct command_line *cmd, const char 
> *cmd_string,
>  		      enum compile_i_scope_types scope, void *scope_data)
>  {
> -  struct cleanup *cleanup_unlink;
>    struct compile_module *compile_module;
> 
>    compile_file_names fnames = compile_to_object (cmd, cmd_string, 
> scope);
> 
> -  cleanup_unlink = make_cleanup (cleanup_unlink_file,
> -				 (void *) fnames.object_file ());
> -  make_cleanup (cleanup_unlink_file, (void *) fnames.source_file ());
> +  gdb::unlinker object_remover (fnames.object_file ());
> +  gdb::unlinker source_remover (fnames.source_file ());
> +
>    compile_module = compile_object_load (fnames, scope, scope_data);
>    if (compile_module == NULL)
>      {
> @@ -610,7 +606,11 @@ eval_compile_command (struct command_line *cmd,
> const char *cmd_string,
>  			    COMPILE_I_PRINT_VALUE_SCOPE, scope_data);
>        return;
>      }
> -  discard_cleanups (cleanup_unlink);
> +
> +  /* Keep the files.  */
> +  source_remover.keep ();
> +  object_remover.keep ();
> +
>    compile_object_run (compile_module);
>  }

LGTM.  For the next patches, I'll skip those that Pedro had simply OK'ed 
in v1, since I don't think it needs reviewing again.

Simon