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gcc-12 always-false in fread.c #5476

Merged
merged 4 commits into from
Oct 6, 2022
Merged

gcc-12 always-false in fread.c #5476

merged 4 commits into from
Oct 6, 2022

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mattdowle
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With gcc 12.1 as displayed on CRAN currently

Version: 1.14.2
Flags: --no-tests
Check: whether package can be installed
Result: WARN
    Found the following significant warnings:
     fread.c:1278:38: warning: the comparison will always evaluate as ‘false’ for the pointer operand
                               in ‘nastr + 8’ must not be NULL [-Waddress]
Flavor: r-devel-linux-x86_64-debian-gcc

@mattdowle mattdowle added the CRAN label Oct 6, 2022
@mattdowle mattdowle added this to the 1.14.4 milestone Oct 6, 2022
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codecov bot commented Oct 6, 2022

Codecov Report

Merging #5476 (f2964c1) into master (2f67531) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5476   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files          78       80    +2     
  Lines       14756    14770   +14     
=======================================
+ Hits        14684    14698   +14     
  Misses         72       72           
Impacted Files Coverage Δ
R/notin.R 100.00% <100.00%> (ø)
src/fread.c 99.41% <100.00%> (ø)
src/init.c 100.00% <100.00%> (ø)
src/negate.c 100.00% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

@mattdowle mattdowle merged commit 5eb46e8 into master Oct 6, 2022
@mattdowle mattdowle deleted the gcc-12 branch October 6, 2022 04:02
@jangorecki
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There was an issue and PR already to resolve this
#5377

@mattdowle
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mattdowle commented Oct 6, 2022

NB: turning on -Waddress in cc.R with gcc 11.2 doesn't detect it. I tried adding -Waddress to cc.R so that we wouldn't need gcc 12 to detect it. -Wall is already on in cc.R so I guess that -Wall already includes -Waddress but that something has improved in gcc 12 that now detects this; i.e. it's not just that -Waddress is now included by -Wall in gcc 12.

strcmp(ch,"True")==0 || strcmp(ch,"False")==0)
STOP(_("freadMain: NAstring <<%s>> is recognized as type boolean, this is not permitted."), ch);
if ((strcmp(ch,"1")==0 || strcmp(ch,"0")==0) && args.logical01)
STOP(_("freadMain: NAstring <<%s>> and logical01=%s, this is not permitted."), ch, args.logical01 ? "TRUE" : "FALSE");
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slightly confused by the templating in the string here am I missing something? in the error case logical01 is always TRUE?

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@mattdowle mattdowle Oct 7, 2022

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good spot. agree and logical01=TRUE, this could be in the string directly and the ternary isn't needed.

STOP(_("freadMain: NAstring <<%s>> and logical01=%s, this is not permitted."), ch, args.logical01 ? "TRUE" : "FALSE");
char *end;
errno = 0;
(void)strtod(ch, &end); // careful not to let "" get to here (see continue above) as strtod considers "" numeric
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@MichaelChirico MichaelChirico Oct 7, 2022

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comment looks stale now that 'continue' is removed

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indeed. good spot.

mattdowle added a commit that referenced this pull request Oct 7, 2022
mattdowle added a commit that referenced this pull request Oct 9, 2022
mattdowle added a commit that referenced this pull request Oct 9, 2022
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Jan 25, 2024
# data.table [v1.14.10](https:/Rdatatable/data.table/milestone/20)

## NOTES

1. Maintainer of the package for CRAN releases is from now on Tyson
  Barrett (@TysonStanley),
  [#5710](Rdatatable/data.table#5710).

2. Updated internal code for breaking change of `is.atomic(NULL)` in
  R-devel,
  [#5691](Rdatatable/data.table#5691). Thanks to
  Martin Maechler for the patch.

3. Fix multiple test concerning coercion to missing complex numbers,
  [#5695](Rdatatable/data.table#5695) and
  [#5748](Rdatatable/data.table#5748). Thanks
  to @MichaelChirico and @ben-schwen for the patches.

4. Fix multiple format warnings (e.g., -Wformat)
  [#5712](Rdatatable/data.table#5712),
  [#5781](Rdatatable/data.table#5781),
  [#5880](Rdatatable/data.table#5800),
  [#5786](Rdatatable/data.table#5786). Thanks to
  @MichaelChirico and @jangorecki for the patches.



# data.table [v1.14.8](https:/Rdatatable/data.table/milestone/28?closed=1)  (17 Feb 2023)

## NOTES

1. Test 1613.605 now passes changes to `as.data.frame()` in R-devel,
  [#5597](Rdatatable/data.table#5597). Thanks to
  Avraham Adler for reporting.

2. An out of bounds read when combining non-equi join with `by=.EACHI`
  has been found and fixed thanks to clang ASAN,
  [#5598](Rdatatable/data.table#5598). There
  was no bug or consequence because the read was followed (now preceded)
  by a bounds test.

3. `.rbind.data.table` (note the leading `.`) is no longer exported
  when `data.table` is installed in R>=4.0.0 (Apr 2020),
  [#5600](Rdatatable/data.table#5600). It was
  never documented which R-devel now detects and warns about. It is only
  needed by `data.table` internals to support R<4.0.0; see note 1 in
  v1.12.6 (Oct 2019) below in this file for more details.


# data.table [v1.14.6](https:/Rdatatable/data.table/milestone/27?closed=1)  (16 Nov 2022)

## BUG FIXES

1. `fread()` could leak memory,
  [#3292](Rdatatable/data.table#3292). Thanks
  to @patrickhowerter for reporting, and Jim Hester for the fix. The fix
  requires R 3.4.0 or later. Loading `data.table` in earlier versions
  now highlights this issue on startup, asks users to upgrade R, and
  warns that we intend to upgrade `data.table`'s dependency from 8 year
  old R 3.1.0 (April 2014) to 5 year old R 3.4.0 (April 2017).

## NOTES

1. Test 1962.098 has been modified to pass latest changes to `POSIXt`
  in R-devel.

2. `test.data.table()` no longer creates `DT` in `.GlobalEnv`, a CRAN
  policy violation,
  [#5514](Rdatatable/data.table#5514). No
  other writes occurred to `.GlobalEnv` and release procedures have been
  improved to prevent this happening again.

3. The memory usage of the test suite has been halved,
  [#5507](Rdatatable/data.table#5507).


# data.table [v1.14.4](https:/Rdatatable/data.table/milestone/26?closed=1)  (17 Oct 2022)

## NOTES

1. gcc 12.1 (May 2022) now detects and warns about an always-false
  condition (`-Waddress`) in `fread` which caused a small efficiency
  saving never to be invoked,
  [#5476](Rdatatable/data.table#5476). Thanks to
  CRAN for testing latest versions of compilers.

2. `update.dev.pkg()` has been renamed `update_dev_pkg()` to get out
  of the way of the `stats::update` generic function,
  [#5421](Rdatatable/data.table#5421). This is a
  utility function which upgrades the version of `data.table` to the
  latest commit in development which has passed all tests. As such we
  don't expect any backwards compatibility concerns. Its manual page was
  causing an intermittent hang/crash from `R CMD check` on Windows-only
  on CRAN which we hope will be worked around by changing its name.

3. Internal C code now passes `-Wstrict-prototypes` to satisfy the
  warnings now displayed on CRAN,
  [#5477](Rdatatable/data.table#5477).

4. `write.csv` in R-devel no longer responds to
  `getOption("digits.secs")` for `POSIXct`,
  [#5478](Rdatatable/data.table#5478). This
  caused our tests of `fwrite(, dateTimeAs="write.csv")` to fail on
  CRAN's daily checks using latest daily R-devel. While R-devel
  discussion continues, and currently it seems like the change is
  intended with further changes possible, this `data.table` release
  massages our tests to pass on latest R-devel. The idea is to try to
  get out of the way of R-devel changes in this regard until the new
  behavior of `write.csv` is released and confirmed. Package updates are
  not accepted on CRAN if they do not pass the latest daily version of
  R-devel, even if R-devel changes after the package update is
  submitted. If the change to `write.csv()` stands, then a future
  release of `data.table` will be needed to make `fwrite(,
  dateTimeAs="write.csv")` match `write.csv()` output again in that
  future version of R onwards. If you use an older version of
  `data.table` than said future one in the said future version of R,
  then `fwrite(, dateTimeAs="write.csv")` may not match `write.csv()` if
  you are using `getOption("digits.secs")` too. However, you can always
  check that your installation of `data.table` works in your version of
  R on your platform by simply running `test.data.table()`
  yourself. Doing so would detect such a situation for you: test 1741
  would fail in this case. `test.data.table()` runs the entire suite of
  tests and is always available to you locally. This way you do not need
  to rely on our statements about which combinations of versions of R
  and `data.table` on which platforms we have tested and support; just
  run `test.data.table()` yourself. Having said that, because test 1741
  has been relaxed in this release in order to be accepted on CRAN to
  pass latest R-devel, this won't be true for this particular release in
  regard to this particular test.

    ```R
    $ R --vanilla
    R version 4.2.1 (2022-06-23) -- "Funny-Looking Kid"
    > DF = data.frame(A=as.POSIXct("2022-10-01 01:23:45.012"))
    > options(digits.secs=0)
    > write.csv(DF)
    "","A"
    "1",2022-10-01 01:23:45
    > options(digits.secs=3)
    > write.csv(DF)
    "","A"
    "1",2022-10-01 01:23:45.012

    $ Rdevel --vanilla
    R Under development (unstable) (2022-10-06 r83040) -- "Unsuffered Consequences"
    > DF = data.frame(A=as.POSIXct("2022-10-01 01:23:45.012"))
    > options(digits.secs=0)
    > write.csv(DF)
    "","A"
    "1",2022-10-01 01:23:45.012
    ```

5. Many thanks to Kurt Hornik for investigating potential impact of a
  possible future change to `base::intersect()` on empty input,
  providing a patch so that `data.table` won't break if the change is
  made to R, and giving us plenty of notice,
  [#5183](Rdatatable/data.table#5183).

6. `datatable.[dll|so]` has changed name to `data_table.[dll|so]`,
  [#4442](Rdatatable/data.table#4442). Thanks to
  Jan Gorecki for the PR. We had previously removed the `.` since `.` is
  not allowed by the following paragraph in the Writing-R-Extensions
  manual. Replacing `.` with `_` instead now seems more consistent with
  the last sentence.

    > ... the basename of the DLL needs to be both a valid file name
      and valid as part of a C entry point (e.g. it cannot contain
      ‘.’): for portable code it is best to confine DLL names to be
      ASCII alphanumeric plus underscore. If entry point R_init_lib is
      not found it is also looked for with ‘.’ replaced by ‘_’.


# data.table [v1.14.2](https:/Rdatatable/data.table/milestone/24?closed=1)  (27 Sep 2021)

## NOTES

1. clang 13.0.0 (Sep 2021) requires the system header `omp.h` to be
  included before R's headers,
  [#5122](Rdatatable/data.table#5122). Many
  thanks to Prof Ripley for testing and providing a patch file.
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