On Tue, Aug 9, 2022 at 2:03 PM Martin Liška <mli...@suse.cz> wrote:
>
> Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
>
> Ready to be installed?
> Thanks,
> Martin
>
> gcc/ChangeLog:
>
> * gcc.cc (driver::detect_jobserver): Remove and move to
> jobserver.h.
> * lto-wrapper.cc (jobserver_active_p): Likewise.
> (run_gcc): Likewise.
> * jobserver.h: New file.
> ---
> gcc/gcc.cc | 36 +++-----------------
> gcc/jobserver.h | 85 ++++++++++++++++++++++++++++++++++++++++++++++
> gcc/lto-wrapper.cc | 43 +++++------------------
> 3 files changed, 97 insertions(+), 67 deletions(-)
> create mode 100644 gcc/jobserver.h
>
> diff --git a/gcc/gcc.cc b/gcc/gcc.cc
> index 5cbb38560b2..69fbd293eaa 100644
> --- a/gcc/gcc.cc
> +++ b/gcc/gcc.cc
> @@ -43,6 +43,7 @@ compilation is specified by a string called a "spec". */
> #include "opts.h"
> #include "filenames.h"
> #include "spellcheck.h"
> +#include "jobserver.h"
>
>
>
> @@ -9178,38 +9179,9 @@ driver::final_actions () const
> void
> driver::detect_jobserver () const
> {
> - /* Detect jobserver and drop it if it's not working. */
> - const char *makeflags = env.get ("MAKEFLAGS");
> - if (makeflags != NULL)
> - {
> - const char *needle = "--jobserver-auth=";
> - const char *n = strstr (makeflags, needle);
> - if (n != NULL)
> - {
> - int rfd = -1;
> - int wfd = -1;
> -
> - bool jobserver
> - = (sscanf (n + strlen (needle), "%d,%d", &rfd, &wfd) == 2
> - && rfd > 0
> - && wfd > 0
> - && is_valid_fd (rfd)
> - && is_valid_fd (wfd));
> -
> - /* Drop the jobserver if it's not working now. */
> - if (!jobserver)
> - {
> - unsigned offset = n - makeflags;
> - char *dup = xstrdup (makeflags);
> - dup[offset] = '\0';
> -
> - const char *space = strchr (makeflags + offset, ' ');
> - if (space != NULL)
> - strcpy (dup + offset, space);
> - xputenv (concat ("MAKEFLAGS=", dup, NULL));
> - }
> - }
> - }
> + jobserver_info jinfo;
> + if (!jinfo.is_active && !jinfo.skipped_makeflags.empty ())
> + xputenv (jinfo.skipped_makeflags.c_str ());
> }
>
> /* Determine what the exit code of the driver should be. */
> diff --git a/gcc/jobserver.h b/gcc/jobserver.h
> new file mode 100644
> index 00000000000..85453dd3c79
> --- /dev/null
> +++ b/gcc/jobserver.h
> @@ -0,0 +1,85 @@
> +/* GNU make's jobserver related functionality.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> +
> +This file is part of GCC.
> +
> +GCC is free software; you can redistribute it and/or modify it under
> +the terms of the GNU General Public License as published by the Free
> +Software Foundation; either version 3, or (at your option) any later
> +version.
> +
> +GCC is distributed in the hope that it will be useful, but WITHOUT ANY
> +WARRANTY; without even the implied warranty of MERCHANTABILITY or
> +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
> +for more details.
> +
> +You should have received a copy of the GNU General Public License
> +along with GCC; see the file COPYING3. If not see
> +<http://www.gnu.org/licenses/>.
> +
> +See dbgcnt.def for usage information. */
> +
> +#ifndef GCC_JOBSERVER_H
> +#define GCC_JOBSERVER_H
> +
> +#include <string>
C++ standard library includes have to go through system.h (#define
INCLUDE_STRING).
Does the API really have to use std::string?
> +
> +using namespace std;
> +
> +struct jobserver_info
> +{
> + /* Default constructor. */
> + jobserver_info ();
> +
> + /* Error message if there is a problem. */
> + string error_msg = "";
> + /* Skipped MAKEFLAGS where --jobserver-auth is skipped. */
> + string skipped_makeflags = "";
> + /* File descriptor for reading used for jobserver communication. */
> + int rfd = -1;
> + /* File descriptor for writing used for jobserver communication. */
> + int wfd = -1;
> + /* Return true if jobserver is active. */
> + bool is_active = false;
> +};
> +
> +jobserver_info::jobserver_info ()
> +{
> + /* Detect jobserver and drop it if it's not working. */
> + string js_needle = "--jobserver-auth=";
> +
> + const char *envval = getenv ("MAKEFLAGS");
> + if (envval != NULL)
> + {
> + string makeflags = envval;
> + size_t n = makeflags.rfind (js_needle);
> + if (n != string::npos)
> + {
> + if (sscanf (makeflags.c_str () + n + js_needle.size (),
> + "%d,%d", &rfd, &wfd) == 2
> + && rfd > 0
> + && wfd > 0
> + && is_valid_fd (rfd)
> + && is_valid_fd (wfd))
> + is_active = true;
> + else
> + {
> + string dup = makeflags.substr (0, n);
> + size_t pos = makeflags.find (' ', n);
> + if (pos != string::npos)
> + dup += makeflags.substr (pos);
> + skipped_makeflags = "MAKEFLAGS=" + dup;
> + error_msg
> + = "cannot access %<" + js_needle + "%> file descriptors";
> + }
> + }
> + error_msg = "%<" + js_needle + "%> is not present in %<MAKEFLAGS%>";
> + }
> + else
> + error_msg = "%<MAKEFLAGS%> environment variable is unset";
> +
> + if (!error_msg.empty ())
> + error_msg = "jobserver is not available: " + error_msg;
> +}
> +
> +#endif /* GCC_JOBSERVER_H */
> diff --git a/gcc/lto-wrapper.cc b/gcc/lto-wrapper.cc
> index 795ab74555c..9279958d055 100644
> --- a/gcc/lto-wrapper.cc
> +++ b/gcc/lto-wrapper.cc
> @@ -49,6 +49,8 @@ along with GCC; see the file COPYING3. If not see
> #include "lto-section-names.h"
> #include "collect-utils.h"
> #include "opts-diagnostic.h"
> +#include "opt-suggestions.h"
> +#include "jobserver.h"
>
> /* Environment variable, used for passing the names of offload targets from
> GCC
> driver to lto-wrapper. */
> @@ -1336,35 +1338,6 @@ init_num_threads (void)
> #endif
> }
>
> -/* Test and return reason why a jobserver cannot be detected. */
> -
> -static const char *
> -jobserver_active_p (void)
> -{
> - #define JS_PREFIX "jobserver is not available: "
> - #define JS_NEEDLE "--jobserver-auth="
> -
> - const char *makeflags = getenv ("MAKEFLAGS");
> - if (makeflags == NULL)
> - return JS_PREFIX "%<MAKEFLAGS%> environment variable is unset";
> -
> - const char *n = strstr (makeflags, JS_NEEDLE);
> - if (n == NULL)
> - return JS_PREFIX "%<" JS_NEEDLE "%> is not present in %<MAKEFLAGS%>";
> -
> - int rfd = -1;
> - int wfd = -1;
> -
> - if (sscanf (n + strlen (JS_NEEDLE), "%d,%d", &rfd, &wfd) == 2
> - && rfd > 0
> - && wfd > 0
> - && is_valid_fd (rfd)
> - && is_valid_fd (wfd))
> - return NULL;
> - else
> - return JS_PREFIX "cannot access %<" JS_NEEDLE "%> file descriptors";
> -}
> -
> /* Print link to -flto documentation with a hint message. */
>
> void
> @@ -1422,7 +1395,6 @@ run_gcc (unsigned argc, char *argv[])
> bool jobserver_requested = false;
> int auto_parallel = 0;
> bool no_partition = false;
> - const char *jobserver_error = NULL;
> bool fdecoded_options_first = true;
> vec<cl_decoded_option> fdecoded_options;
> fdecoded_options.create (16);
> @@ -1653,14 +1625,14 @@ run_gcc (unsigned argc, char *argv[])
> }
> else
> {
> - jobserver_error = jobserver_active_p ();
> - if (jobserver && jobserver_error != NULL)
> + jobserver_info jinfo;
> + if (jobserver && !jinfo.is_active)
> {
> /* Fall back to auto parallelism. */
> jobserver = 0;
> auto_parallel = 1;
> }
> - else if (!jobserver && jobserver_error == NULL)
> + else if (!jobserver && jinfo.is_active)
> {
> parallel = 1;
> jobserver = 1;
> @@ -1971,9 +1943,10 @@ cont:
>
> if (nr > 1)
> {
> - if (jobserver_requested && jobserver_error != NULL)
> + jobserver_info jinfo;
> + if (jobserver_requested && !jinfo.is_active)
> {
> - warning (0, jobserver_error);
> + warning (0, jinfo.error_msg.c_str ());
> print_lto_docs_link ();
> }
> else if (parallel == 0)
> --
> 2.37.1
>
>
