[patch #8515] AX_GCC_ARCHFLAG: reorder option checking for Clang

[Tsukasa Oi]

URL:
  <http://savannah.gnu.org/patch/?8515>

                 Summary: AX_GCC_ARCHFLAG: reorder option checking for Clang
                 Project: GNU Autoconf Archive
            Submitted by: a4lg
            Submitted on: 2014年08月15日 18時51分01秒
                Priority: 5 - Normal
                  Status: None
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

https://savannah.gnu.org/patch/index.php?8514

As I mentioned in the submission above, LLVM Clang support on this macro is
partially corrupt because of different error handling from GCC.

For instance, in my Ivy Bridge environment with Clang compiler,

* AX_GCC_ARCHFLAG([no]) selects option `-mcpu=ivybridge' which is not really
supported by LLVM Clang
* AX_GCC_ARCHFLAG([yes]) selects option `-mtune=ivybridge' which is not really
support by LLVM Clang (as well)

This is because Clang does not fail on unknown processor type specified in
-mcpu=... and -mtune=... options. This fix (changes order of option checking)
does not resolve all the problems (AX_GCC_ARCHFLAG([yes]) still selects
`-mtune=ivybridge') but it will solve *some* of them.

Please note that the submitted patch is expected to be applied after the patch
#8514 but you could apply this patch first (with small modifications).



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File Attachments:


-------------------------------------------------------
Date: 2014年08月15日 18時51分01秒  Name:
0001-AX_GCC_ARCHFLAG-reorder-option-checking-for-Clang.patch  Size: 2kB   By:
a4lg

<http://savannah.gnu.org/patch/download.php?file_id=31904>

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