| Summary: | ASTERISK-27687: FreeBSD: powl has lower than advertised precision. | ||
| Reporter: | Alexander Traud (traud) | Labels: | |
| Date Opened: | 2018-02-17 04:06:35.000-0600 | Date Closed: | |
| Priority: | Minor | Regression? | |
| Status: | Open/New | Components: | Core/Platform |
| Versions: | 13.19.1 | Frequency of Occurrence | |
| Related Issues: | |||
| Environment: | FreeBSD 11.1 base compiler (clang) | Attachments: | |
| Description: | 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 sudo 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 of 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 falls back to {{pow(.)}}. Because in Asterisk, 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. | ||
| Comments: | By: Asterisk Team (asteriskteam) 2018-02-17 04:06:36.741-0600 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]. By: Corey Farrell (coreyfarrell) 2018-02-27 23:59:21.354-0600 Related ticket: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191754 Can you try to define {{_DECLARE_C99_LDBL_MATH}}, see if that has any effect? By: Alexander Traud (traud) 2018-02-28 02:15:28.629-0600 Not sure how that ticket is related. In that ticket, powl was not found by the preprocessor at all. According to that ticket, after defining {{_DECLARE_C99_LDBL_MATH}} powl was found but the same warning message is created. | ||