[asterisk-bugs] [JIRA] (ASTERISK-20850) nested functions aren't portable

[Diederik de Groot (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=217638#comment-217638 ] 

Diederik de Groot edited comment on ASTERISK-20850 at 4/28/14 8:12 AM:
-----------------------------------------------------------------------

Making it possible again to use clang as a compiler, instead of depending on gcc completely.

Compile instructions:
================
{{./bootstrap.sh}}
{{CC=clang CXX=clang++ ./configure --enable-dev-mode}}
Needed to set DISABLE_INLINE to get passed the double declaration error in api-inline.h, i guess someone needs to figure out how to get this passed clang, correctly :-)
{{make menuselect.makeopts}}
{{menuselect/menuselect --enable DISABLE_INLINE}}
Needed to suppresse some of the warnings to get clang to compile (for now), clang can be a little panicky, but for a good reason.

* -Wno-unknown-warning-option. When gcc doesn't know a compiler option it returns NON-ZERO errorlevel, clang returns ZERO errorlevel, which is annoying. Even the linux kernel developers group complained about this. Will be fixed/changed (hopefully soon). For now, when checking clang compiler options, you would need to grep and parse the error output
* -Wno-error needed to quite down clang being panicky (Standard asterisk -Werror is a good idea in general, but not when compiling against a 'new' compiler ;-))

{{ASTCFLAGS="-Wno-unknown-warning-option -Wno-error" make}}
{{make install}}
RAII_VAR seems to work, but i guess there is still a bit of work before clang support can be announced.



was (Author: dkdegroot):
Making it possible again to use clang as a compiler, instead of depending on gcc completely.

Compile instructions:
================
{{./bootstrap.sh}}
{{CC=clang CXX=clang++ ./configure --enable-dev-mode}}
Needed to set DISABLE_INLINE to get passed the double declaration error in api-inline.h, i guess someone needs to figure out how to get this passed clang, correctly :-)
{{make menuselect.makeopts}}
{{menuselect/menuselect --enable DISABLE_INLINE}}
Needed to suppresse some of the warnings to get clang to compile (for now), clang can be a little panicky, but for a good reason.

* -Wno-unknown-warning-option. When gcc doesn't know a compiler option it returns NON-ZERO errorlevel, clang returns ZERO errorlevel, which is annoying. Even the linux kernel developers group complained about this. Will be fixed/changed (hopefully soon). For now, when checking clang compiler options, you would need to grep and parse the error output
* -Wno-error needed to quite down clang being panicky (Standard asterisk -Werror is a good idea in general, but not when compiling against a 'new' compiler ;-))
{{ASTCFLAGS="-Wno-unknown-warning-option -Wno-error" make}}
{{make install}}
RAII_VAR seems to work, but i guess there is still a bit of work before clang support can be announced.


> nested functions aren't portable
> --------------------------------
>
>                 Key: ASTERISK-20850
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20850
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: General
>    Affects Versions: 11.1.0
>         Environment: CLANG
>            Reporter: Diederik de Groot
>            Assignee: Diederik de Groot
>         Attachments: RAII_CLANG.patch
>
>
> Nested functions are a GCC extension that is not sanctioned by C standards, thus the use of them is non-portable.  Specifically, CLANG does not support them.  CLANG is used by OSX, current versions of FreeBSD, and NetBSD is experimenting with it.  The RAII_VAR macro in include/asterisk/utils.h creates nested functions.  This prevents Asterisk 11.* from compiling with CLANG.



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