* bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination
@ 2009-02-27 4:14 sand
2016-01-14 4:48 ` Andrew Hyatt
0 siblings, 1 reply; 6+ messages in thread
From: sand @ 2009-02-27 4:14 UTC (permalink / raw)
To: emacs-pretest-bug; +Cc: rfrancoise
Background
----------
The Flymake library shipped with CVS HEAD (and probably earlier) has
the following code in `flymake-post-syntax-check':
(defun flymake-post-syntax-check (exit-status command)
;; [. . . elided . . .]
(if (and (equal 0 err-count) (equal 0 warn-count))
(if (equal 0 exit-status)
(flymake-report-status "" "") ; PASSED
(if (not flymake-check-was-interrupted)
(flymake-report-fatal-status "CFGERR"
(format "Configuration error has occured while running %s" command))
(flymake-report-status nil ""))) ; "STOPPED"
(flymake-report-status (format "%d/%d" err-count warn-count) "")))
Depending on...
...whether the flymake check generated errors or warnings,
...whether the flymake check had a non-zero exit status, and
...whether we interrupted the flymake check,
we can generate any of four different statuses. One of the statuses,
"CFGERR" is fatal, and turns off flymake for that buffer. The others
are non-fatal.
Problem
-------
Flymake only tracks errors that refer to the specific file being
checked. For example, given the following output for "foo.c",
which includes file "bar.h"
foo.c:20: warning: Type mismatch
bar.h:30: error: Invalid syntax
Flymake would "see" one warning and no errors. The "bar.h" error is
dropped. Now consider the degenerate case where "bar.h" is the only
source of errors, *and the check returns a non-zero exit status*:
bar.h:30: error: Invalid syntax
The error and warning counts are zero, the exit status is non-zero,
the check was not interrupted, so we end up reporting a fatal CFGERR.
Think aobut the user experience here, with the two examples shown
above. First, Flymake checks, and reports an warning in the current
file "foo.c". The user fixes the warning. Then Flymake reports a
fatal error (popping up a dialog box under X) and turns itself off!
Solution
--------
That particular code branch is supposed to catch cases where the build
system itself dies with an error, which is important to detect. But
shutting down Flymake is too excessive a response, because of errors
in included files.
The following replacement code changes the behavior to report zero
errors and zero warnings with the file itself, but it adds a ":CFGERR"
flag to indicate that there was some other problem with the check.
Flymake remains enabled for the buffer.
(defun flymake-post-syntax-check (exit-status command)
;; [. . . elided . . .]
(if (and (equal 0 err-count) (equal 0 warn-count))
(if (equal 0 exit-status)
(flymake-report-status "" "") ; PASSED
(if (not flymake-check-was-interrupted)
(flymake-report-status "0/0" ":CFGERR")
(flymake-report-status nil ""))) ; "STOPPED"
(flymake-report-status (format "%d/%d" err-count warn-count) "")))
Derek
In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
of 2009-02-07 on elegiac, modified by Debian
(emacs-snapshot package, version 1:20090207-1)
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp' '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination
2009-02-27 4:14 bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination sand
@ 2016-01-14 4:48 ` Andrew Hyatt
2016-01-15 2:48 ` Derek Upham
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Hyatt @ 2016-01-14 4:48 UTC (permalink / raw)
To: sand; +Cc: 2491, rfrancoise
Thanks for the bug report, and sorry it's sat so long without any
movement. Looking over this, I don't particularly understand the issue
(why would the check return a non-zero exit status if it was working
properly?) It might help if you provided a simple example.
I've looked at the code in Emacs 25, though, and it still has the logic
you report.
sand@blarg.net writes:
> Background
> ----------
>
> The Flymake library shipped with CVS HEAD (and probably earlier) has
> the following code in `flymake-post-syntax-check':
>
> (defun flymake-post-syntax-check (exit-status command)
> ;; [. . . elided . . .]
>
> (if (and (equal 0 err-count) (equal 0 warn-count))
> (if (equal 0 exit-status)
> (flymake-report-status "" "") ; PASSED
> (if (not flymake-check-was-interrupted)
> (flymake-report-fatal-status "CFGERR"
> (format "Configuration error has occured while running %s" command))
> (flymake-report-status nil ""))) ; "STOPPED"
> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>
> Depending on...
>
> ...whether the flymake check generated errors or warnings,
> ...whether the flymake check had a non-zero exit status, and
> ...whether we interrupted the flymake check,
>
> we can generate any of four different statuses. One of the statuses,
> "CFGERR" is fatal, and turns off flymake for that buffer. The others
> are non-fatal.
>
> Problem
> -------
>
> Flymake only tracks errors that refer to the specific file being
> checked. For example, given the following output for "foo.c",
> which includes file "bar.h"
>
> foo.c:20: warning: Type mismatch
> bar.h:30: error: Invalid syntax
>
> Flymake would "see" one warning and no errors. The "bar.h" error is
> dropped. Now consider the degenerate case where "bar.h" is the only
> source of errors, *and the check returns a non-zero exit status*:
>
> bar.h:30: error: Invalid syntax
>
> The error and warning counts are zero, the exit status is non-zero,
> the check was not interrupted, so we end up reporting a fatal CFGERR.
>
> Think aobut the user experience here, with the two examples shown
> above. First, Flymake checks, and reports an warning in the current
> file "foo.c". The user fixes the warning. Then Flymake reports a
> fatal error (popping up a dialog box under X) and turns itself off!
>
> Solution
> --------
>
> That particular code branch is supposed to catch cases where the build
> system itself dies with an error, which is important to detect. But
> shutting down Flymake is too excessive a response, because of errors
> in included files.
>
> The following replacement code changes the behavior to report zero
> errors and zero warnings with the file itself, but it adds a ":CFGERR"
> flag to indicate that there was some other problem with the check.
> Flymake remains enabled for the buffer.
>
> (defun flymake-post-syntax-check (exit-status command)
> ;; [. . . elided . . .]
>
> (if (and (equal 0 err-count) (equal 0 warn-count))
> (if (equal 0 exit-status)
> (flymake-report-status "" "") ; PASSED
> (if (not flymake-check-was-interrupted)
> (flymake-report-status "0/0" ":CFGERR")
> (flymake-report-status nil ""))) ; "STOPPED"
> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>
>
> Derek
>
>
>
>
> In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
> of 2009-02-07 on elegiac, modified by Debian
> (emacs-snapshot package, version 1:20090207-1)
> Windowing system distributor `The X.Org Foundation', version 11.0.10402000
> configured using `configure '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp' '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination
2016-01-14 4:48 ` Andrew Hyatt
@ 2016-01-15 2:48 ` Derek Upham
2016-01-24 21:23 ` Andrew Hyatt
0 siblings, 1 reply; 6+ messages in thread
From: Derek Upham @ 2016-01-15 2:48 UTC (permalink / raw)
To: Andrew Hyatt; +Cc: 2491, rfrancoise
The situation is a flymake check for “foo.c”, where “foo.c” is perfectly fine but it #includes “bar.h” which has a syntax error.
Flymake triggers a compilation. The compilation fails due to the syntax error, returning a non-zero exit status, along with the text
bar.h:30: error: Invalid syntax
Flymake quietly drops any error messages that refer to anything other than “foo.c”. As far as it is concerned, the above error output is empty. That means...
- The error and warning counts are zero
- The exit status is non-zero
- The check was not interrupted
The nested ‘if’ clauses in ‘flymake-post-syntax-check’ route control through:
(flymake-report-fatal-status "CFGERR"
(format "Configuration error has occured while running %s" command))
This code reports a fatal error and permanently turns off Flymake in the buffer. After you fix the syntax error in “bar.h”, you have to restart Flymake in “foo.c” (and any other files that depended on it). The bug is that we need to explicitly restart Flymake.
The proposed solution in the bug report is to treat this case as a non-fatal situation, with a special mode line tag to indicate “there’s a deeper problem”. (It would be great if we could point the user to an error in “bar.h” line 30, but I don’t think there’s a good way to do it in the UI.) Upon reflection, I think it’s better for Flymake to keep counts of errors and warnings in “other” files (not ignore them) and use that to improve the post-syntax-check tests with another “if” clause.
(I’m pretty sure this was with Erlang code, which is why no one else has encountered the bug. As I recall, GCC provides enough breadcrumbs that the #include line in the .c file will be tagged as a problem. The Erlang compiler doesn’t show that information, or didn’t back then.)
Derek
ahyatt@gmail.com writes:
> Thanks for the bug report, and sorry it's sat so long without any
> movement. Looking over this, I don't particularly understand the issue
> (why would the check return a non-zero exit status if it was working
> properly?) It might help if you provided a simple example.
>
> I've looked at the code in Emacs 25, though, and it still has the logic
> you report.
>
> sand@blarg.net writes:
>
>> Background
>> ----------
>>
>> The Flymake library shipped with CVS HEAD (and probably earlier) has
>> the following code in `flymake-post-syntax-check':
>>
>> (defun flymake-post-syntax-check (exit-status command)
>> ;; [. . . elided . . .]
>>
>> (if (and (equal 0 err-count) (equal 0 warn-count))
>> (if (equal 0 exit-status)
>> (flymake-report-status "" "") ; PASSED
>> (if (not flymake-check-was-interrupted)
>> (flymake-report-fatal-status "CFGERR"
>> (format "Configuration error has occured while running %s" command))
>> (flymake-report-status nil ""))) ; "STOPPED"
>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>>
>> Depending on...
>>
>> ...whether the flymake check generated errors or warnings,
>> ...whether the flymake check had a non-zero exit status, and
>> ...whether we interrupted the flymake check,
>>
>> we can generate any of four different statuses. One of the statuses,
>> "CFGERR" is fatal, and turns off flymake for that buffer. The others
>> are non-fatal.
>>
>> Problem
>> -------
>>
>> Flymake only tracks errors that refer to the specific file being
>> checked. For example, given the following output for "foo.c",
>> which includes file "bar.h"
>>
>> foo.c:20: warning: Type mismatch
>> bar.h:30: error: Invalid syntax
>>
>> Flymake would "see" one warning and no errors. The "bar.h" error is
>> dropped. Now consider the degenerate case where "bar.h" is the only
>> source of errors, *and the check returns a non-zero exit status*:
>>
>> bar.h:30: error: Invalid syntax
>>
>> The error and warning counts are zero, the exit status is non-zero,
>> the check was not interrupted, so we end up reporting a fatal CFGERR.
>>
>> Think aobut the user experience here, with the two examples shown
>> above. First, Flymake checks, and reports an warning in the current
>> file "foo.c". The user fixes the warning. Then Flymake reports a
>> fatal error (popping up a dialog box under X) and turns itself off!
>>
>> Solution
>> --------
>>
>> That particular code branch is supposed to catch cases where the build
>> system itself dies with an error, which is important to detect. But
>> shutting down Flymake is too excessive a response, because of errors
>> in included files.
>>
>> The following replacement code changes the behavior to report zero
>> errors and zero warnings with the file itself, but it adds a ":CFGERR"
>> flag to indicate that there was some other problem with the check.
>> Flymake remains enabled for the buffer.
>>
>> (defun flymake-post-syntax-check (exit-status command)
>> ;; [. . . elided . . .]
>>
>> (if (and (equal 0 err-count) (equal 0 warn-count))
>> (if (equal 0 exit-status)
>> (flymake-report-status "" "") ; PASSED
>> (if (not flymake-check-was-interrupted)
>> (flymake-report-status "0/0" ":CFGERR")
>> (flymake-report-status nil ""))) ; "STOPPED"
>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>>
>>
>> Derek
>>
>>
>>
>>
>> In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
>> of 2009-02-07 on elegiac, modified by Debian
>> (emacs-snapshot package, version 1:20090207-1)
>> Windowing system distributor `The X.Org Foundation', version 11.0.10402000
>> configured using `configure '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man'
> '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp'
> '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''
--
Derek Upham
sand@blarg.net
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination
2016-01-15 2:48 ` Derek Upham
@ 2016-01-24 21:23 ` Andrew Hyatt
2016-01-25 4:19 ` Derek Upham
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Hyatt @ 2016-01-24 21:23 UTC (permalink / raw)
To: Derek Upham; +Cc: 2491, rfrancoise
Got it. So, if I understand correctly, this may or may not be fixed,
but in any case, it seems specific to Erlang. Hopefully you, or another
Erlang user, can attempt to reproduce it so that we can move forward on
this bug.
Derek Upham <sand@blarg.net> writes:
> The situation is a flymake check for “foo.c”, where “foo.c” is perfectly fine but it #includes “bar.h” which has a syntax error.
>
> Flymake triggers a compilation. The compilation fails due to the syntax error, returning a non-zero exit status, along with the text
>
> bar.h:30: error: Invalid syntax
>
> Flymake quietly drops any error messages that refer to anything other than “foo.c”. As far as it is concerned, the above error output is empty. That means...
>
> - The error and warning counts are zero
> - The exit status is non-zero
> - The check was not interrupted
>
> The nested ‘if’ clauses in ‘flymake-post-syntax-check’ route control through:
>
> (flymake-report-fatal-status "CFGERR"
> (format "Configuration error has occured while running %s" command))
>
> This code reports a fatal error and permanently turns off Flymake in the buffer. After you fix the syntax error in “bar.h”, you have to restart Flymake in “foo.c” (and any other files that depended on it). The bug is that we need to explicitly restart Flymake.
>
> The proposed solution in the bug report is to treat this case as a non-fatal situation, with a special mode line tag to indicate “there’s a deeper problem”. (It would be great if we could point the user to an error in “bar.h” line 30, but I don’t think there’s a good way to do it in the UI.) Upon reflection, I think it’s better for Flymake to keep counts of errors and warnings in “other” files (not ignore them) and use that to improve the post-syntax-check tests with another “if” clause.
>
> (I’m pretty sure this was with Erlang code, which is why no one else has encountered the bug. As I recall, GCC provides enough breadcrumbs that the #include line in the .c file will be tagged as a problem. The Erlang compiler doesn’t show that information, or didn’t back then.)
>
> Derek
>
> ahyatt@gmail.com writes:
>
>> Thanks for the bug report, and sorry it's sat so long without any
>> movement. Looking over this, I don't particularly understand the issue
>> (why would the check return a non-zero exit status if it was working
>> properly?) It might help if you provided a simple example.
>>
>> I've looked at the code in Emacs 25, though, and it still has the logic
>> you report.
>>
>> sand@blarg.net writes:
>>
>>> Background
>>> ----------
>>>
>>> The Flymake library shipped with CVS HEAD (and probably earlier) has
>>> the following code in `flymake-post-syntax-check':
>>>
>>> (defun flymake-post-syntax-check (exit-status command)
>>> ;; [. . . elided . . .]
>>>
>>> (if (and (equal 0 err-count) (equal 0 warn-count))
>>> (if (equal 0 exit-status)
>>> (flymake-report-status "" "") ; PASSED
>>> (if (not flymake-check-was-interrupted)
>>> (flymake-report-fatal-status "CFGERR"
>>> (format "Configuration error has occured while running %s" command))
>>> (flymake-report-status nil ""))) ; "STOPPED"
>>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>>>
>>> Depending on...
>>>
>>> ...whether the flymake check generated errors or warnings,
>>> ...whether the flymake check had a non-zero exit status, and
>>> ...whether we interrupted the flymake check,
>>>
>>> we can generate any of four different statuses. One of the statuses,
>>> "CFGERR" is fatal, and turns off flymake for that buffer. The others
>>> are non-fatal.
>>>
>>> Problem
>>> -------
>>>
>>> Flymake only tracks errors that refer to the specific file being
>>> checked. For example, given the following output for "foo.c",
>>> which includes file "bar.h"
>>>
>>> foo.c:20: warning: Type mismatch
>>> bar.h:30: error: Invalid syntax
>>>
>>> Flymake would "see" one warning and no errors. The "bar.h" error is
>>> dropped. Now consider the degenerate case where "bar.h" is the only
>>> source of errors, *and the check returns a non-zero exit status*:
>>>
>>> bar.h:30: error: Invalid syntax
>>>
>>> The error and warning counts are zero, the exit status is non-zero,
>>> the check was not interrupted, so we end up reporting a fatal CFGERR.
>>>
>>> Think aobut the user experience here, with the two examples shown
>>> above. First, Flymake checks, and reports an warning in the current
>>> file "foo.c". The user fixes the warning. Then Flymake reports a
>>> fatal error (popping up a dialog box under X) and turns itself off!
>>>
>>> Solution
>>> --------
>>>
>>> That particular code branch is supposed to catch cases where the build
>>> system itself dies with an error, which is important to detect. But
>>> shutting down Flymake is too excessive a response, because of errors
>>> in included files.
>>>
>>> The following replacement code changes the behavior to report zero
>>> errors and zero warnings with the file itself, but it adds a ":CFGERR"
>>> flag to indicate that there was some other problem with the check.
>>> Flymake remains enabled for the buffer.
>>>
>>> (defun flymake-post-syntax-check (exit-status command)
>>> ;; [. . . elided . . .]
>>>
>>> (if (and (equal 0 err-count) (equal 0 warn-count))
>>> (if (equal 0 exit-status)
>>> (flymake-report-status "" "") ; PASSED
>>> (if (not flymake-check-was-interrupted)
>>> (flymake-report-status "0/0" ":CFGERR")
>>> (flymake-report-status nil ""))) ; "STOPPED"
>>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>>>
>>>
>>> Derek
>>>
>>>
>>>
>>>
>>> In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
>>> of 2009-02-07 on elegiac, modified by Debian
>>> (emacs-snapshot package, version 1:20090207-1)
>>> Windowing system distributor `The X.Org Foundation', version 11.0.10402000
>>> configured using `configure '--build' 'i486-linux-gnu' '--host'
>>> 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
>>> '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info'
>>> '--mandir=/usr/share/man'
>> '--with-pop=yes'
>> '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp'
>> '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination
2016-01-24 21:23 ` Andrew Hyatt
@ 2016-01-25 4:19 ` Derek Upham
2016-01-25 4:22 ` Andrew Hyatt
0 siblings, 1 reply; 6+ messages in thread
From: Derek Upham @ 2016-01-25 4:19 UTC (permalink / raw)
To: Andrew Hyatt; +Cc: 2491, rfrancoise
This many years down the line I’m not in a position to reproduce it, so just close it out as “can’t repro”.
Thanks,
Derek
Andrew Hyatt writes:
> Got it. So, if I understand correctly, this may or may not be fixed,
> but in any case, it seems specific to Erlang. Hopefully you, or another
> Erlang user, can attempt to reproduce it so that we can move forward on
> this bug.
>
> Derek Upham <sand@blarg.net> writes:
>
>> The situation is a flymake check for “foo.c”, where “foo.c” is perfectly fine but it #includes “bar.h” which has a syntax error.
>>
>> Flymake triggers a compilation. The compilation fails due to the syntax error, returning a non-zero exit status, along with the text
>>
>> bar.h:30: error: Invalid syntax
>>
>> Flymake quietly drops any error messages that refer to anything other than “foo.c”. As far as it is concerned, the above error output is empty. That means...
>>
>> - The error and warning counts are zero
>> - The exit status is non-zero
>> - The check was not interrupted
>>
>> The nested ‘if’ clauses in ‘flymake-post-syntax-check’ route control through:
>>
>> (flymake-report-fatal-status "CFGERR"
>> (format "Configuration error has occured while running %s" command))
>>
>> This code reports a fatal error and permanently turns off Flymake in the buffer. After you fix the syntax error in “bar.h”, you have to restart Flymake in “foo.c” (and any other files that depended on it). The bug is that we need to explicitly restart Flymake.
>>
>> The proposed solution in the bug report is to treat this case as a non-fatal situation, with a special mode line tag to indicate “there’s a deeper problem”. (It would be great if we could point the user to an error in “bar.h” line 30, but I don’t think there’s a good way to do it in the UI.) Upon reflection, I think it’s better for Flymake to keep counts of errors and warnings in “other” files (not ignore them) and use that to improve the post-syntax-check tests with another “if” clause.
>>
>> (I’m pretty sure this was with Erlang code, which is why no one else has encountered the bug. As I recall, GCC provides enough breadcrumbs that the #include line in the .c file will be tagged as a problem. The Erlang compiler doesn’t show that information, or didn’t back then.)
>>
>> Derek
>>
>> ahyatt@gmail.com writes:
>>
>>> Thanks for the bug report, and sorry it's sat so long without any
>>> movement. Looking over this, I don't particularly understand the issue
>>> (why would the check return a non-zero exit status if it was working
>>> properly?) It might help if you provided a simple example.
>>>
>>> I've looked at the code in Emacs 25, though, and it still has the logic
>>> you report.
>>>
>>> sand@blarg.net writes:
>>>
>>>> Background
>>>> ----------
>>>>
>>>> The Flymake library shipped with CVS HEAD (and probably earlier) has
>>>> the following code in `flymake-post-syntax-check':
>>>>
>>>> (defun flymake-post-syntax-check (exit-status command)
>>>> ;; [. . . elided . . .]
>>>>
>>>> (if (and (equal 0 err-count) (equal 0 warn-count))
>>>> (if (equal 0 exit-status)
>>>> (flymake-report-status "" "") ; PASSED
>>>> (if (not flymake-check-was-interrupted)
>>>> (flymake-report-fatal-status "CFGERR"
>>>> (format "Configuration error has occured while running %s" command))
>>>> (flymake-report-status nil ""))) ; "STOPPED"
>>>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>>>>
>>>> Depending on...
>>>>
>>>> ...whether the flymake check generated errors or warnings,
>>>> ...whether the flymake check had a non-zero exit status, and
>>>> ...whether we interrupted the flymake check,
>>>>
>>>> we can generate any of four different statuses. One of the statuses,
>>>> "CFGERR" is fatal, and turns off flymake for that buffer. The others
>>>> are non-fatal.
>>>>
>>>> Problem
>>>> -------
>>>>
>>>> Flymake only tracks errors that refer to the specific file being
>>>> checked. For example, given the following output for "foo.c",
>>>> which includes file "bar.h"
>>>>
>>>> foo.c:20: warning: Type mismatch
>>>> bar.h:30: error: Invalid syntax
>>>>
>>>> Flymake would "see" one warning and no errors. The "bar.h" error is
>>>> dropped. Now consider the degenerate case where "bar.h" is the only
>>>> source of errors, *and the check returns a non-zero exit status*:
>>>>
>>>> bar.h:30: error: Invalid syntax
>>>>
>>>> The error and warning counts are zero, the exit status is non-zero,
>>>> the check was not interrupted, so we end up reporting a fatal CFGERR.
>>>>
>>>> Think aobut the user experience here, with the two examples shown
>>>> above. First, Flymake checks, and reports an warning in the current
>>>> file "foo.c". The user fixes the warning. Then Flymake reports a
>>>> fatal error (popping up a dialog box under X) and turns itself off!
>>>>
>>>> Solution
>>>> --------
>>>>
>>>> That particular code branch is supposed to catch cases where the build
>>>> system itself dies with an error, which is important to detect. But
>>>> shutting down Flymake is too excessive a response, because of errors
>>>> in included files.
>>>>
>>>> The following replacement code changes the behavior to report zero
>>>> errors and zero warnings with the file itself, but it adds a ":CFGERR"
>>>> flag to indicate that there was some other problem with the check.
>>>> Flymake remains enabled for the buffer.
>>>>
>>>> (defun flymake-post-syntax-check (exit-status command)
>>>> ;; [. . . elided . . .]
>>>>
>>>> (if (and (equal 0 err-count) (equal 0 warn-count))
>>>> (if (equal 0 exit-status)
>>>> (flymake-report-status "" "") ; PASSED
>>>> (if (not flymake-check-was-interrupted)
>>>> (flymake-report-status "0/0" ":CFGERR")
>>>> (flymake-report-status nil ""))) ; "STOPPED"
>>>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
>>>>
>>>>
>>>> Derek
>>>>
>>>>
>>>>
>>>>
>>>> In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
>>>> of 2009-02-07 on elegiac, modified by Debian
>>>> (emacs-snapshot package, version 1:20090207-1)
>>>> Windowing system distributor `The X.Org Foundation', version 11.0.10402000
>>>> configured using `configure '--build' 'i486-linux-gnu' '--host'
>>>> 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
>>>> '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info'
>>>> '--mandir=/usr/share/man'
>>> '--with-pop=yes'
>>> '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp'
>>> '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''
--
Derek Upham
sand@blarg.net
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination
2016-01-25 4:19 ` Derek Upham
@ 2016-01-25 4:22 ` Andrew Hyatt
0 siblings, 0 replies; 6+ messages in thread
From: Andrew Hyatt @ 2016-01-25 4:22 UTC (permalink / raw)
To: Derek Upham; +Cc: 2491, rfrancoise
[-- Attachment #1: Type: text/plain, Size: 7450 bytes --]
Thanks, Derek.
On Sun, Jan 24, 2016 at 11:19 PM Derek Upham <sand@blarg.net> wrote:
> This many years down the line I’m not in a position to reproduce it, so
> just close it out as “can’t repro”.
>
> Thanks,
>
> Derek
>
> Andrew Hyatt writes:
>
> > Got it. So, if I understand correctly, this may or may not be fixed,
> > but in any case, it seems specific to Erlang. Hopefully you, or another
> > Erlang user, can attempt to reproduce it so that we can move forward on
> > this bug.
> >
> > Derek Upham <sand@blarg.net> writes:
> >
> >> The situation is a flymake check for “foo.c”, where “foo.c” is
> perfectly fine but it #includes “bar.h” which has a syntax error.
> >>
> >> Flymake triggers a compilation. The compilation fails due to the
> syntax error, returning a non-zero exit status, along with the text
> >>
> >> bar.h:30: error: Invalid syntax
> >>
> >> Flymake quietly drops any error messages that refer to anything other
> than “foo.c”. As far as it is concerned, the above error output is empty.
> That means...
> >>
> >> - The error and warning counts are zero
> >> - The exit status is non-zero
> >> - The check was not interrupted
> >>
> >> The nested ‘if’ clauses in ‘flymake-post-syntax-check’ route control
> through:
> >>
> >> (flymake-report-fatal-status "CFGERR"
> >> (format "Configuration error has occured while running %s" command))
> >>
> >> This code reports a fatal error and permanently turns off Flymake in
> the buffer. After you fix the syntax error in “bar.h”, you have to restart
> Flymake in “foo.c” (and any other files that depended on it). The bug is
> that we need to explicitly restart Flymake.
> >>
> >> The proposed solution in the bug report is to treat this case as a
> non-fatal situation, with a special mode line tag to indicate “there’s a
> deeper problem”. (It would be great if we could point the user to an error
> in “bar.h” line 30, but I don’t think there’s a good way to do it in the
> UI.) Upon reflection, I think it’s better for Flymake to keep counts of
> errors and warnings in “other” files (not ignore them) and use that to
> improve the post-syntax-check tests with another “if” clause.
> >>
> >> (I’m pretty sure this was with Erlang code, which is why no one else
> has encountered the bug. As I recall, GCC provides enough breadcrumbs that
> the #include line in the .c file will be tagged as a problem. The Erlang
> compiler doesn’t show that information, or didn’t back then.)
> >>
> >> Derek
> >>
> >> ahyatt@gmail.com writes:
> >>
> >>> Thanks for the bug report, and sorry it's sat so long without any
> >>> movement. Looking over this, I don't particularly understand the issue
> >>> (why would the check return a non-zero exit status if it was working
> >>> properly?) It might help if you provided a simple example.
> >>>
> >>> I've looked at the code in Emacs 25, though, and it still has the logic
> >>> you report.
> >>>
> >>> sand@blarg.net writes:
> >>>
> >>>> Background
> >>>> ----------
> >>>>
> >>>> The Flymake library shipped with CVS HEAD (and probably earlier) has
> >>>> the following code in `flymake-post-syntax-check':
> >>>>
> >>>> (defun flymake-post-syntax-check (exit-status command)
> >>>> ;; [. . . elided . . .]
> >>>>
> >>>> (if (and (equal 0 err-count) (equal 0 warn-count))
> >>>> (if (equal 0 exit-status)
> >>>> (flymake-report-status "" "") ; PASSED
> >>>> (if (not flymake-check-was-interrupted)
> >>>> (flymake-report-fatal-status "CFGERR"
> >>>> (format "Configuration error has occured while running %s" command))
> >>>> (flymake-report-status nil ""))) ; "STOPPED"
> >>>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
> >>>>
> >>>> Depending on...
> >>>>
> >>>> ...whether the flymake check generated errors or warnings,
> >>>> ...whether the flymake check had a non-zero exit status, and
> >>>> ...whether we interrupted the flymake check,
> >>>>
> >>>> we can generate any of four different statuses. One of the statuses,
> >>>> "CFGERR" is fatal, and turns off flymake for that buffer. The others
> >>>> are non-fatal.
> >>>>
> >>>> Problem
> >>>> -------
> >>>>
> >>>> Flymake only tracks errors that refer to the specific file being
> >>>> checked. For example, given the following output for "foo.c",
> >>>> which includes file "bar.h"
> >>>>
> >>>> foo.c:20: warning: Type mismatch
> >>>> bar.h:30: error: Invalid syntax
> >>>>
> >>>> Flymake would "see" one warning and no errors. The "bar.h" error is
> >>>> dropped. Now consider the degenerate case where "bar.h" is the only
> >>>> source of errors, *and the check returns a non-zero exit status*:
> >>>>
> >>>> bar.h:30: error: Invalid syntax
> >>>>
> >>>> The error and warning counts are zero, the exit status is non-zero,
> >>>> the check was not interrupted, so we end up reporting a fatal CFGERR.
> >>>>
> >>>> Think aobut the user experience here, with the two examples shown
> >>>> above. First, Flymake checks, and reports an warning in the current
> >>>> file "foo.c". The user fixes the warning. Then Flymake reports a
> >>>> fatal error (popping up a dialog box under X) and turns itself off!
> >>>>
> >>>> Solution
> >>>> --------
> >>>>
> >>>> That particular code branch is supposed to catch cases where the build
> >>>> system itself dies with an error, which is important to detect. But
> >>>> shutting down Flymake is too excessive a response, because of errors
> >>>> in included files.
> >>>>
> >>>> The following replacement code changes the behavior to report zero
> >>>> errors and zero warnings with the file itself, but it adds a ":CFGERR"
> >>>> flag to indicate that there was some other problem with the check.
> >>>> Flymake remains enabled for the buffer.
> >>>>
> >>>> (defun flymake-post-syntax-check (exit-status command)
> >>>> ;; [. . . elided . . .]
> >>>>
> >>>> (if (and (equal 0 err-count) (equal 0 warn-count))
> >>>> (if (equal 0 exit-status)
> >>>> (flymake-report-status "" "") ; PASSED
> >>>> (if (not flymake-check-was-interrupted)
> >>>> (flymake-report-status "0/0" ":CFGERR")
> >>>> (flymake-report-status nil ""))) ; "STOPPED"
> >>>> (flymake-report-status (format "%d/%d" err-count warn-count) "")))
> >>>>
> >>>>
> >>>> Derek
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
> >>>> of 2009-02-07 on elegiac, modified by Debian
> >>>> (emacs-snapshot package, version 1:20090207-1)
> >>>> Windowing system distributor `The X.Org Foundation', version
> 11.0.10402000
> >>>> configured using `configure '--build' 'i486-linux-gnu' '--host'
> >>>> 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
> >>>> '--libexecdir=/usr/lib' '--localstatedir=/var'
> '--infodir=/usr/share/info'
> >>>> '--mandir=/usr/share/man'
> >>> '--with-pop=yes'
> >>>
> '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp'
> >>> '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu'
> 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000
> -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''
>
>
> --
> Derek Upham
> sand@blarg.net
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-01-25 4:22 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-02-27 4:14 bug#2491: 23.0.90; Flymake too aggressive when responding to unusual error combination sand
2016-01-14 4:48 ` Andrew Hyatt
2016-01-15 2:48 ` Derek Upham
2016-01-24 21:23 ` Andrew Hyatt
2016-01-25 4:19 ` Derek Upham
2016-01-25 4:22 ` Andrew Hyatt
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