#17 gcc compile question.

[Brian]

I am trying to compile my own example and I am getting the following error:
pi@raspberrypi ~/Astro/libnova-0.15.0/examples $ gcc mars.c -o testmars
/tmp/ccuct9Oi.o: In function main': mars.c:(.text+0xe8): undefined reference toln_get_julian_from_sys'
mars.c:(.text+0x108): undefined reference to ln_get_mars_helio_coords' mars.c:(.text+0x13c): undefined reference toln_get_mars_equ_coords'
mars.c:(.text+0x150): undefined reference to ln_equ_to_hequ' mars.c:(.text+0x1a0): undefined reference toln_get_mars_earth_dist'
mars.c:(.text+0x1b8): undefined reference to ln_get_mars_solar_dist' mars.c:(.text+0x1d0): undefined reference toln_get_mars_disk'
mars.c:(.text+0x1e8): undefined reference to ln_get_mars_magnitude' mars.c:(.text+0x200): undefined reference toln_get_mars_phase'
mars.c:(.text+0x228): undefined reference to ln_get_mars_rst' mars.c:(.text+0x254): undefined reference toln_get_local_date'
mars.c:(.text+0x268): undefined reference to ln_get_local_date' mars.c:(.text+0x27c): undefined reference toln_get_local_date'
collect2: error: ld returned 1 exit status

This is using just the example mars.c that ships with it, no changes made to it.
I am not very familular with C, so I am sure its some thing simple causing it. Any help would be wonderful.

[Brian]

Ah I just figured it out right after I posted. I need to use libtool to compile it. So something like this:

pi@raspberrypi ~/Astro/libnova-0.15.0/examples $ gcc -c testmars.c -o testmars.o
pi@raspberrypi ~/Astro/libnova-0.15.0/examples $ ../libtool --tag=CC --mode=link gcc -Wall -o testmars testmars.o ../src/libnova.la -lm

[Liam Girdwood]

Hi Brian,

On 13 November 2015 at 19:56, Brian blee1170@users.sf.net wrote:

Ah I just figured it out right after I posted. I need to use libtool to
compile it. So something like this:

Yep, if you are compiling against a non installed version of libnova then
you need to use libtool etc (the examples use this method). If libnova is
installed on your system lib path then you just need to use -lnova as a gcc
option.

Thanks

Liam

pi@raspberrypi ~/Astro/libnova-0.15.0/examples $ gcc -c testmars.c -o
testmars.o
pi@raspberrypi ~/Astro/libnova-0.15.0/examples $ ../libtool --tag=CC
--mode=link gcc -Wall -o testmars testmars.o ../src/libnova.la -lm

---

• [bugs:#17] http://sourceforge.net/p/libnova/bugs/17/ gcc compile
  question.*

Status: open
Group: v1.0_(example)
Created: Fri Nov 13, 2015 07:45 PM UTC by Brian
Last Updated: Fri Nov 13, 2015 07:45 PM UTC
Owner: nobody

I am trying to compile my own example and I am getting the following error:
pi@raspberrypi ~/Astro/libnova-0.15.0/examples $ gcc mars.c -o testmars
/tmp/ccuct9Oi.o: In function main': mars.c:(.text+0xe8): undefined
reference toln_get_julian_from_sys'
mars.c:(.text+0x108): undefined reference to ln_get_mars_helio_coords'
mars.c:(.text+0x13c): undefined reference toln_get_mars_equ_coords'
mars.c:(.text+0x150): undefined reference to ln_equ_to_hequ'
mars.c:(.text+0x1a0): undefined reference toln_get_mars_earth_dist'
mars.c:(.text+0x1b8): undefined reference to ln_get_mars_solar_dist'
mars.c:(.text+0x1d0): undefined reference toln_get_mars_disk'
mars.c:(.text+0x1e8): undefined reference to ln_get_mars_magnitude'
mars.c:(.text+0x200): undefined reference toln_get_mars_phase'
mars.c:(.text+0x228): undefined reference to ln_get_mars_rst'
mars.c:(.text+0x254): undefined reference toln_get_local_date'
mars.c:(.text+0x268): undefined reference to ln_get_local_date'
mars.c:(.text+0x27c): undefined reference toln_get_local_date'
collect2: error: ld returned 1 exit status

This is using just the example mars.c that ships with it, no changes made
to it.
I am not very familular with C, so I am sure its some thing simple causing
it. Any help would be wonderful.

---

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