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jgaeddert / liquid-dsp

digital signal processing library for software-defined radios
http://liquidsdr.org
MIT License
1.89k stars 443 forks source link

Error attempting "make examples" #284

Closed AndresChoza closed 2 years ago

AndresChoza commented 2 years ago

Hi, I've already run the "make" command as I was having trouble before but now I cannot run the "make examples" command supposedly because of some undefined references to functions contained in "math.h":

image

Any tips?

jgaeddert commented 2 years ago

You're seeing a linker error. It's not finding the math library. I suspect you have it installed but it isn't in your path. What do you get when you run the following?

gcc --print-file-name=libm.a
AndresChoza commented 2 years ago

Hi there.

I get the following:

choza@chozaUbuntu:~/Documents/liquid-dsp$ gcc --print-file-name=libm.a /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libm.a

I tried to modify the makefile so that the "-lm" linker flag was specifically at the end like this:

image

Now I don't get the error reported above, but instead I'm getting this while trying out "make examples":

image

AndresChoza commented 2 years ago

Also, since we're on the same "trouble with make" page, I'm having trouble building the docs with "make doc".

image

Could these be related to each other?

jgaeddert commented 2 years ago
  1. Your modifications to the makefile aren't really correct (they imply that -lm is a dependency on the objects), but it seems as though make throws together the compiler/linker commands in the right order to get this to work.
  2. The undefined references to the fec library are a result from its interface having changed. If you can live without convolutional & Reed Solomon codes, you might try to compile without them. I can help with this.
  3. This is questionable. I haven't bundled documentation with liquid since v1.2.0 (about 10 years ago)
AndresChoza commented 2 years ago

Right, so what can I do to fix the 'make doc' command? I'm in need of this documentation

Thanks beforehand.

jgaeddert commented 2 years ago

The documentation is not part of the main repository, but is built in https://liquidsdr.org