[asterisk-bugs] [JIRA] (ASTERISK-27687) FreeBSD: powl has lower than advertised precision.

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=242247#comment-242247 ] 

Asterisk Team commented on ASTERISK-27687:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> FreeBSD: powl has lower than advertised precision.
> --------------------------------------------------
>
>                 Key: ASTERISK-27687
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27687
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: . I did not set the category correctly.
>    Affects Versions: 13.19.1
>         Environment: FreeBSD 11.1
> base compiler (clang)
>            Reporter: Alexander Traud
>            Severity: Minor
>
> After patching all of my found issues (see ASTERISK-27686), this is the only, the last warning message which remains on FreeBSD when I go [for|http://lists.digium.com/pipermail/asterisk-dev/2018-January/076765.html]:{code}fetch --no-verify-peer http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-13-current.tar.gz
> tar -zxf asterisk-*
> cd asterisk-*
> sudo ./contrib/scripts/install_prereq install
> ./configure --with-pjproject-bundled
> make
> make install samples config
> asterisk -c{code}Unfortunately, the message does not say what to do instead. Therefore, I do not know how to proceed except to report it:{code}
> ast_expr2.o: In function `op_func':
> main/ast_expr2.y:882: warning: powl has lower than advertised precision{code}The cause are [Expr2|https://wiki.asterisk.org/wiki/display/AST/Expr2+Built-in+Functions] which bridge standard C functions, like {{powl(.)}}. Because that, a [macro|http://sources.freebsd.org/HEAD/src/lib/msun/src/imprecise.c] in FreeBSD is triggered. Even found a more [detailed explanation|https://android.googlesource.com/platform/bionic/+/f723b70%5E%21/] in the Android Open Source Project: {quote}On LP64, sizeof(long double) > sizeof(double), so functions which fall back to their double variants lose precision. Emit a warning whenever something links against such functions. On LP32, sizeof(long double) == sizeof(double), so we don't need to warn.{quote}There that code then falls back to {{pow(.)}}. Because FreeBSD has only community contributed support, perhaps someone interested in FreeBSD can start with this analysis and find a fix, like a pragma for the compiler or another workaround.



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