while make libhackrf can't be found

[stathis94s]

gcc -Wall -lm -lc -lliquid -lhackrf -o hackrf_rssi hackrf_rssi.c
hackrf_rssi.c: In function ‘main’:
hackrf_rssi.c:112:47: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 2 has type ‘uint64_t {aka long unsigned int}’ [-Wformat=]
if(verbose) printf("Setting frequency to %llu Hz...", frequency);
~~~^
%lu
/tmp/ccH92Mfn.o: In function rx_callback': hackrf_rssi.c:(.text+0x9a): undefined reference to iirfilt_crcf_create_dc_blocker'
hackrf_rssi.c:(.text+0xa6): undefined reference to agc_crcf_create' hackrf_rssi.c:(.text+0xc4): undefined reference to agc_crcf_set_bandwidth'
hackrf_rssi.c:(.text+0x1ac): undefined reference to iirfilt_crcf_execute' hackrf_rssi.c:(.text+0x205): undefined reference to agc_crcf_execute'
hackrf_rssi.c:(.text+0x22c): undefined reference to agc_crcf_get_rssi' hackrf_rssi.c:(.text+0x250): undefined reference to iirfilt_crcf_destroy'
hackrf_rssi.c:(.text+0x25f): undefined reference to agc_crcf_destroy' /tmp/ccH92Mfn.o: In function main':
hackrf_rssi.c:(.text+0x3d0): undefined reference to hackrf_init' hackrf_rssi.c:(.text+0x3e3): undefined reference to hackrf_error_name'
hackrf_rssi.c:(.text+0x41f): undefined reference to hackrf_open' hackrf_rssi.c:(.text+0x432): undefined reference to hackrf_error_name'
hackrf_rssi.c:(.text+0x4a0): undefined reference to hackrf_set_freq' hackrf_rssi.c:(.text+0x4b3): undefined reference to hackrf_error_name'
hackrf_rssi.c:(.text+0x4f0): undefined reference to hackrf_set_lna_gain' hackrf_rssi.c:(.text+0x50a): undefined reference to hackrf_set_vga_gain'
hackrf_rssi.c:(.text+0x51d): undefined reference to hackrf_error_name' hackrf_rssi.c:(.text+0x557): undefined reference to hackrf_compute_baseband_filter_bw'
hackrf_rssi.c:(.text+0x56a): undefined reference to hackrf_set_baseband_filter_bandwidth' hackrf_rssi.c:(.text+0x58c): undefined reference to hackrf_set_sample_rate'
hackrf_rssi.c:(.text+0x59f): undefined reference to hackrf_error_name' hackrf_rssi.c:(.text+0x5f6): undefined reference to hackrf_start_rx'
hackrf_rssi.c:(.text+0x609): undefined reference to hackrf_error_name' hackrf_rssi.c:(.text+0x6e4): undefined reference to hackrf_stop_rx'
hackrf_rssi.c:(.text+0x6f7): undefined reference to hackrf_error_name' hackrf_rssi.c:(.text+0x73a): undefined reference to hackrf_close'
hackrf_rssi.c:(.text+0x74d): undefined reference to hackrf_error_name' hackrf_rssi.c:(.text+0x78b): undefined reference to hackrf_exit'
collect2: error: ld returned 1 exit status
Makefile:11: recipe for target 'hackrf_rssi' failed
make: *** [hackrf_rssi] Error 1
stathis@stathis-HP-Pavilion-Gami

[jguzman-tech]

I was stumped on this for a while too. For anyone else that comes across this, the order of arguments does matter for gcc. You have to put the library arguments at the end.

gcc -Wall -o hackrf_rssi hackrf_rssi.c -lm -lc -lliquid -lhackrf

[jyehn]

I was stumped on this for a while too. For anyone else that comes across this, the order of arguments does matter for gcc. You have to put the library arguments at the end.

gcc -Wall -o hackrf_rssi hackrf_rssi.c -lm -lc -lliquid -lhackrf

Thanks a lot, bro!!!It helps.

[mackmgg]

Huh, not sure why that's the case, but I'll add it to the Readme!

I guess I've only ever tried building it on macOS where 'gcc' is actually clang.

Thanks!