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

[Alexander Traud (JIRA)]

Alexander Traud created ASTERISK-27687:
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             Summary: 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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