+2020-02-15 David Malcolm <dmalcolm@redhat.com>
+ Bernd Edlinger <bernd.edlinger@hotmail.de>
+
+ PR 87488
+ PR other/93168
+ * config.in (DIAGNOSTICS_URLS_DEFAULT): New define.
+ * configure.ac (--with-diagnostics-urls): New configuration
+ option, based on --with-diagnostics-color.
+ (DIAGNOSTICS_URLS_DEFAULT): New define.
+ * config.h: Regenerate.
+ * configure: Regenerate.
+ * diagnostic.c (diagnostic_urls_init): Handle -1 for
+ DIAGNOSTICS_URLS_DEFAULT from configure-time
+ --with-diagnostics-urls=auto-if-env by querying for a GCC_URLS
+ and TERM_URLS environment variable.
+ * diagnostic-url.h (diagnostic_url_format): New enum type.
+ (diagnostic_urls_enabled_p): rename to...
+ (determine_url_format): ... this, and change return type.
+ * diagnostic-color.c (parse_env_vars_for_urls): New helper function.
+ (auto_enable_urls): Disable URLs on xfce4-terminal, gnome-terminal,
+ the linux console, and mingw.
+ (diagnostic_urls_enabled_p): rename to...
+ (determine_url_format): ... this, and adjust.
+ * pretty-print.h (pretty_printer::show_urls): rename to...
+ (pretty_printer::url_format): ... this, and change to enum.
+ * pretty-print.c (pretty_printer::pretty_printer,
+ pp_begin_url, pp_end_url, test_urls): Adjust.
+ * doc/install.texi (--with-diagnostics-urls): Document the new
+ configuration option.
+ (--with-diagnostics-color): Document the existing interaction
+ with GCC_COLORS better.
+ * doc/invoke.texi (-fdiagnostics-urls): Add GCC_URLS and TERM_URLS
+ vindex reference. Update description of defaults based on the above.
+ (-fdiagnostics-color): Update description of how -fdiagnostics-color
+ interacts with GCC_COLORS.
+
2020-02-14 Eric Botcazou <ebotcazou@adacore.com>
PR target/93704
#endif
+/* The default for -fdiagnostics-urls option */
+#ifndef USED_FOR_TARGET
+#undef DIAGNOSTICS_URLS_DEFAULT
+#endif
+
+
/* Define 0/1 if static analyzer feature is enabled. */
#ifndef USED_FOR_TARGET
#undef ENABLE_ANALYZER
enable_libquadmath_support
with_linker_hash_style
with_diagnostics_color
+with_diagnostics_urls
enable_default_pie
'
ac_precious_vars='build_alias
auto-if-env stands for -fdiagnostics-color=auto if
GCC_COLOR environment variable is present and
-fdiagnostics-color=never otherwise
+ --with-diagnostics-urls={never,auto,auto-if-env,always}
+ specify the default of -fdiagnostics-urls option
+ auto-if-env stands for -fdiagnostics-urls=auto if
+ GCC_URLS or TERM_URLS environment variable is
+ present and -fdiagnostics-urls=never otherwise
Some influential environment variables:
CC C compiler command
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 18977 "configure"
+#line 18983 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 19083 "configure"
+#line 19089 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
_ACEOF
+# Specify what should be the default of -fdiagnostics-urls option.
+
+# Check whether --with-diagnostics-urls was given.
+if test "${with_diagnostics_urls+set}" = set; then :
+ withval=$with_diagnostics_urls; case x"$withval" in
+ xnever)
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_NO
+ ;;
+ xauto)
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_AUTO
+ ;;
+ xauto-if-env)
+ DIAGNOSTICS_URLS_DEFAULT=-1
+ ;;
+ xalways)
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_YES
+ ;;
+ *)
+ as_fn_error $? "$withval is an invalid option to --with-diagnostics-urls" "$LINENO" 5
+ ;;
+ esac
+else
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_AUTO
+fi
+
+
+cat >>confdefs.h <<_ACEOF
+#define DIAGNOSTICS_URLS_DEFAULT $DIAGNOSTICS_URLS_DEFAULT
+_ACEOF
+
+
# Generate gcc-driver-name.h containing GCC_DRIVER_NAME for the benefit
# of jit/jit-playback.c.
gcc_driver_version=`eval "${get_gcc_base_ver} $srcdir/BASE-VER"`
AC_DEFINE_UNQUOTED(DIAGNOSTICS_COLOR_DEFAULT, $DIAGNOSTICS_COLOR_DEFAULT,
[The default for -fdiagnostics-color option])
+# Specify what should be the default of -fdiagnostics-urls option.
+AC_ARG_WITH([diagnostics-urls],
+[AC_HELP_STRING([--with-diagnostics-urls={never,auto,auto-if-env,always}],
+ [specify the default of -fdiagnostics-urls option
+ auto-if-env stands for -fdiagnostics-urls=auto if
+ GCC_URLS or TERM_URLS environment variable is present and
+ -fdiagnostics-urls=never otherwise])],
+[case x"$withval" in
+ xnever)
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_NO
+ ;;
+ xauto)
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_AUTO
+ ;;
+ xauto-if-env)
+ DIAGNOSTICS_URLS_DEFAULT=-1
+ ;;
+ xalways)
+ DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_YES
+ ;;
+ *)
+ AC_MSG_ERROR([$withval is an invalid option to --with-diagnostics-urls])
+ ;;
+ esac],
+[DIAGNOSTICS_URLS_DEFAULT=DIAGNOSTICS_URL_AUTO])
+AC_DEFINE_UNQUOTED(DIAGNOSTICS_URLS_DEFAULT, $DIAGNOSTICS_URLS_DEFAULT,
+ [The default for -fdiagnostics-urls option])
+
# Generate gcc-driver-name.h containing GCC_DRIVER_NAME for the benefit
# of jit/jit-playback.c.
gcc_driver_version=`eval "${get_gcc_base_ver} $srcdir/BASE-VER"`
&& GetConsoleMode (h, &m);
#else
char const *t = getenv ("TERM");
+ /* emacs M-x shell sets TERM="dumb". */
return t && strcmp (t, "dumb") != 0 && isatty (STDERR_FILENO);
#endif
}
}
}
-/* Determine if URLs should be enabled, based on RULE.
+/* Return URL_FORMAT_XXX which tells how we should emit urls
+ when in always mode.
+ We use GCC_URLS and if that is not defined TERM_URLS.
+ If neither is defined the feature is enabled by default. */
+
+static diagnostic_url_format
+parse_env_vars_for_urls ()
+{
+ const char *p;
+
+ p = getenv ("GCC_URLS"); /* Plural! */
+ if (p == NULL)
+ p = getenv ("TERM_URLS");
+
+ if (p == NULL)
+ return URL_FORMAT_DEFAULT;
+
+ if (*p == '\0')
+ return URL_FORMAT_NONE;
+
+ if (!strcmp (p, "no"))
+ return URL_FORMAT_NONE;
+
+ if (!strcmp (p, "st"))
+ return URL_FORMAT_ST;
+
+ if (!strcmp (p, "bel"))
+ return URL_FORMAT_BEL;
+
+ return URL_FORMAT_DEFAULT;
+}
+
+/* Return true if we should use urls when in auto mode, false otherwise. */
+
+static bool
+auto_enable_urls ()
+{
+#ifdef __MINGW32__
+ return false;
+#else
+ const char *term, *colorterm;
+
+ /* First check the terminal is capable of printing color escapes,
+ if not URLs won't work either. */
+ if (!should_colorize ())
+ return false;
+
+ /* xfce4-terminal is known to not implement URLs at this time.
+ Recently new installations (0.8) will safely ignore the URL escape
+ sequences, but a large number of legacy installations (0.6.3) print
+ garbage when URLs are printed. Therefore we lose nothing by
+ disabling this feature for that specific terminal type. */
+ colorterm = getenv ("COLORTERM");
+ if (colorterm && !strcmp (colorterm, "xfce4-terminal"))
+ return false;
+
+ /* Old versions of gnome-terminal where URL escapes cause screen
+ corruptions set COLORTERM="gnome-terminal", recent versions
+ with working URL support set this to "truecolor". */
+ if (colorterm && !strcmp (colorterm, "gnome-terminal"))
+ return false;
+
+ /* Since the following checks are less specific than the ones
+ above, let GCC_URLS and TERM_URLS override the decision. */
+ if (getenv ("GCC_URLS") || getenv ("TERM_URLS"))
+ return true;
+
+ /* In an ssh session the COLORTERM is not there, but TERM=xterm
+ can be used as an indication of a incompatible terminal while
+ TERM=xterm-256color appears to be a working terminal. */
+ term = getenv ("TERM");
+ if (!colorterm && term && !strcmp (term, "xterm"))
+ return false;
+
+ /* When logging in a linux over serial line, we see TERM=linux
+ and no COLORTERM, it is unlikely that the URL escapes will
+ work in that environmen either. */
+ if (!colorterm && term && !strcmp (term, "linux"))
+ return false;
+
+ return true;
+#endif
+}
+
+/* Determine if URLs should be enabled, based on RULE,
+ and, if so, which format to use.
This reuses the logic for colorization. */
-bool
-diagnostic_urls_enabled_p (diagnostic_url_rule_t rule)
+diagnostic_url_format
+determine_url_format (diagnostic_url_rule_t rule)
{
switch (rule)
{
case DIAGNOSTICS_URL_NO:
- return false;
+ return URL_FORMAT_NONE;
case DIAGNOSTICS_URL_YES:
- return true;
+ return parse_env_vars_for_urls ();
case DIAGNOSTICS_URL_AUTO:
- return should_colorize ();
+ if (auto_enable_urls ())
+ return parse_env_vars_for_urls ();
+ else
+ return URL_FORMAT_NONE;
default:
gcc_unreachable ();
}
DIAGNOSTICS_URL_AUTO = 2
} diagnostic_url_rule_t;
-extern bool diagnostic_urls_enabled_p (diagnostic_url_rule_t);
+/* Tells whether URLs should be emitted, and, if so, how to
+ terminate strings within the escape sequence. */
+enum diagnostic_url_format
+{
+ /* No URLs shall be emitted. */
+ URL_FORMAT_NONE,
+
+ /* Use ST string termination. */
+ URL_FORMAT_ST,
+
+ /* Use BEL string termination. */
+ URL_FORMAT_BEL
+};
+
+const diagnostic_url_format URL_FORMAT_DEFAULT = URL_FORMAT_BEL;
+
+extern diagnostic_url_format determine_url_format (diagnostic_url_rule_t);
#endif /* ! GCC_DIAGNOSTIC_URL_H */
void
diagnostic_urls_init (diagnostic_context *context, int value /*= -1 */)
{
+ /* value == -1 is the default value. */
if (value < 0)
- value = DIAGNOSTICS_COLOR_DEFAULT;
+ {
+ /* If DIAGNOSTICS_URLS_DEFAULT is -1, default to
+ -fdiagnostics-urls=auto if GCC_URLS or TERM_URLS is in the
+ environment, otherwise default to -fdiagnostics-urls=never,
+ for other values default to that
+ -fdiagnostics-urls={never,auto,always}. */
+ if (DIAGNOSTICS_URLS_DEFAULT == -1)
+ {
+ if (!getenv ("GCC_URLS") && !getenv ("TERM_URLS"))
+ return;
+ value = DIAGNOSTICS_URL_AUTO;
+ }
+ else
+ value = DIAGNOSTICS_URLS_DEFAULT;
+ }
- context->printer->show_urls
- = diagnostic_urls_enabled_p ((diagnostic_url_rule_t) value);
+ context->printer->url_format
+ = determine_url_format ((diagnostic_url_rule_t) value);
}
/* Do any cleaning up required after the last diagnostic is emitted. */
Tells GCC to use @var{choice} as the default for @option{-fdiagnostics-color=}
option (if not used explicitly on the command line). @var{choice}
can be one of @samp{never}, @samp{auto}, @samp{always}, and @samp{auto-if-env}
-where @samp{auto} is the default. @samp{auto-if-env} means that
-@option{-fdiagnostics-color=auto} will be the default if @code{GCC_COLORS}
-is present and non-empty in the environment, and
+where @samp{auto} is the default. @samp{auto-if-env} makes
+@option{-fdiagnostics-color=auto} the default if @env{GCC_COLORS}
+is present and non-empty in the environment of the compiler, and
@option{-fdiagnostics-color=never} otherwise.
+@item --with-diagnostics-urls=@var{choice}
+Tells GCC to use @var{choice} as the default for @option{-fdiagnostics-urls=}
+option (if not used explicitly on the command line). @var{choice}
+can be one of @samp{never}, @samp{auto}, @samp{always}, and @samp{auto-if-env}
+where @samp{auto} is the default. @samp{auto-if-env} makes
+@option{-fdiagnostics-urls=auto} the default if @env{GCC_URLS}
+or @env{TERM_URLS} is present and non-empty in the environment of the
+compiler, and @option{-fdiagnostics-urls=never} otherwise.
+
@item --enable-lto
@itemx --disable-lto
Enable support for link-time optimization (LTO). This is enabled by
it can be any of the above @var{WHEN} options or also @samp{never}
if @env{GCC_COLORS} environment variable isn't present in the environment,
and @samp{auto} otherwise.
-@samp{auto} means to use color only when the standard error is a terminal.
+@samp{auto} makes GCC use color only when the standard error is a terminal,
+and when not executing in an emacs shell.
The forms @option{-fdiagnostics-color} and @option{-fno-diagnostics-color} are
aliases for @option{-fdiagnostics-color=always} and
@option{-fdiagnostics-color=never}, respectively.
@item -fdiagnostics-urls[=@var{WHEN}]
@opindex fdiagnostics-urls
@cindex urls
+@vindex GCC_URLS @r{environment variable}
+@vindex TERM_URLS @r{environment variable}
Use escape sequences to embed URLs in diagnostics. For example, when
@option{-fdiagnostics-show-option} emits text showing the command-line
option controlling a diagnostic, embed a URL for documentation of that
option.
@var{WHEN} is @samp{never}, @samp{always}, or @samp{auto}.
-The default is @samp{auto}, which means to use URL escape sequences only
-when the standard error is a terminal.
+@samp{auto} makes GCC use URL escape sequences only when the standard error
+is a terminal, and when not executing in an emacs shell or any graphical
+terminal which is known to be incompatible with this feature, see below.
+
+The default depends on how the compiler has been configured.
+It can be any of the above @var{WHEN} options.
+
+GCC can also be configured (via the
+@option{--with-diagnostics-urls=auto-if-env} configure-time option)
+so that the default is affected by environment variables.
+Under such a configuration, GCC defaults to using @samp{auto}
+if either @env{GCC_URLS} or @env{TERM_URLS} environment variables are
+present and non-empty in the environment of the compiler, or @samp{never}
+if neither are.
+
+However, even with @option{-fdiagnostics-urls=always} the behavior is
+dependent on those environment variables:
+If @env{GCC_URLS} is set to empty or @samp{no}, do not embed URLs in
+diagnostics. If set to @samp{st}, URLs use ST escape sequences.
+If set to @samp{bel}, the default, URLs use BEL escape sequences.
+Any other non-empty value enables the feature.
+If @env{GCC_URLS} is not set, use @env{TERM_URLS} as a fallback.
+Note: ST is an ANSI escape sequence, string terminator @samp{ESC \},
+BEL is an ASCII character, CTRL-G that usually sounds like a beep.
+
+At this time GCC tries to detect also a few terminals that are known to
+not implement the URL feature, and have bugs or at least had bugs in
+some versions that are still in use, where the URL escapes are likely
+to misbehave, i.e. print garbage on the screen.
+That list is currently xfce4-terminal, certain known to be buggy
+gnome-terminal versions, the linux console, and mingw.
+This check can be skipped with the @option{-fdiagnostics-urls=always}.
@item -fno-diagnostics-show-option
@opindex fno-diagnostics-show-option
need_newline (),
translate_identifiers (true),
show_color (),
- show_urls (false)
+ url_format (URL_FORMAT_NONE)
{
pp_line_cutoff (this) = maximum_length;
/* By default, we emit prefixes once per message. */
need_newline (other.need_newline),
translate_identifiers (other.translate_identifiers),
show_color (other.show_color),
- show_urls (other.show_urls)
+ url_format (other.url_format)
{
pp_line_cutoff (this) = maximum_length;
/* By default, we emit prefixes once per message. */
void
pp_begin_url (pretty_printer *pp, const char *url)
{
- if (pp->show_urls)
+ switch (pp->url_format)
+ {
+ case URL_FORMAT_NONE:
+ break;
+ case URL_FORMAT_ST:
+ pp_printf (pp, "\33]8;;%s\33\\", url);
+ break;
+ case URL_FORMAT_BEL:
pp_printf (pp, "\33]8;;%s\a", url);
+ break;
+ default:
+ gcc_unreachable ();
+ }
}
/* If URL-printing is enabled, write a "close URL" escape sequence to PP. */
void
pp_end_url (pretty_printer *pp)
{
- if (pp->show_urls)
+ switch (pp->url_format)
+ {
+ case URL_FORMAT_NONE:
+ break;
+ case URL_FORMAT_ST:
+ pp_string (pp, "\33]8;;\33\\");
+ break;
+ case URL_FORMAT_BEL:
pp_string (pp, "\33]8;;\a");
+ break;
+ default:
+ gcc_unreachable ();
+ }
}
#if CHECKING_P
{
{
pretty_printer pp;
- pp.show_urls = false;
+ pp.url_format = URL_FORMAT_NONE;
pp_begin_url (&pp, "http://example.com");
pp_string (&pp, "This is a link");
pp_end_url (&pp);
{
pretty_printer pp;
- pp.show_urls = true;
+ pp.url_format = URL_FORMAT_ST;
+ pp_begin_url (&pp, "http://example.com");
+ pp_string (&pp, "This is a link");
+ pp_end_url (&pp);
+ ASSERT_STREQ ("\33]8;;http://example.com\33\\This is a link\33]8;;\33\\",
+ pp_formatted_text (&pp));
+ }
+
+ {
+ pretty_printer pp;
+ pp.url_format = URL_FORMAT_BEL;
pp_begin_url (&pp, "http://example.com");
pp_string (&pp, "This is a link");
pp_end_url (&pp);
#define GCC_PRETTY_PRINT_H
#include "obstack.h"
+#include "diagnostic-url.h"
/* Maximum number of format string arguments. */
#define PP_NL_ARGMAX 30
/* Nonzero means that text should be colorized. */
bool show_color;
- /* Nonzero means that URLs should be emitted. */
- bool show_urls;
+ /* Whether URLs should be emitted, and which terminator to use. */
+ diagnostic_url_format url_format;
};
static inline const char *
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