[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Discuss-gnuradio] Recent Commit Issue
From: |
Michael Dickens |
Subject: |
[Discuss-gnuradio] Recent Commit Issue |
Date: |
Wed, 26 Jun 2013 14:55:01 -0400 |
Regarding commit c0b3ce38db0eaaca05fe2f45827fcf6c9184b72b "wavelet: fix for
-lgslcblas getting stripped out of the link flags due to -Wl,--as-needed
default on newer gcc toolchains, results in missing blas symbols at runtime",
as well as other assumptions being made about GCC:
<soapbox>
Just because the compiler is GCC does not mean it will accept the flag being
passed to it, nor that it is guaranteed to provide specific functionality if >=
a specific version. Maybe this works on Linux, but it does not on Mac OS X
using either Apple's or MacPorts' GCC (4.2, 4.6, 4.7). So, the above
"-Wl,--no-as-needed" does not work, nor does the "xgetbv" instruction, because
all versions of GCC use Apple's assembler (which does not support these
features).
Clang as provided by Xcode or MacPorts does -not- use Apple's assembler, which
means it should be multi-OS compatible for flags and instructions -- but:
The best way to check for a feature (compiler flag, or specific instruction) is
to actually test for it, just like we do for most other compiler flags,
headers, and many functions (both OS-provided and other dependencies).
</soapbox>
Thanks for listening. I'm patching the MacPorts install of GNU Radio to remove
this commit until a better solution is found. - MLD
- [Discuss-gnuradio] Recent Commit Issue,
Michael Dickens <=