[Discuss-gnuradio] Recent Commit Issue

[Michael Dickens]

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