Building fwts against newer json-c libraries fails because the linker cannot find json-c due to a change introduced in json-c version 0.11. Build fails during linking phase as seen below:
make[3]: Entering directory `/tmp/fwts-test/new/fwts/src'
/bin/sh ../libtool --tag=CC --mode=link gcc -g -O2 -ljson -lm -o fwts main.o ac_adapter.o acpidump.o acpiinfo.o acpitables.o apicinstance.o battery.o brightness-helper.o brightness.o autobrightness.o checksum.o crsdump.o prsdump.o cstates.o dmar.o fadt.o fan.o lid.o mcfg.o method.o osilinux.o pcc.o powerbutton.o s3.o s3power.o s4.o syntaxcheck.o wakealarm.o wmi.o apicedge.o bios_info.o bios32.o ebda_region.o ebdadump.o hdaaudio.o memmapdump.o mtrr.o mpcheck.o mpdump.o os2gap.o pciirq.o pnp.o romdump.o cmosdump.o virt.o virt_svm.o virt_vmx.o maxfreq.o cpufreq.o nx.o msr.o microcode.o dmicheck.o hotkey.o hpet_check.o klog.o oops.o version.o aspm.o crs.o maxreadreq.o csm.o uefidump.o uefirttime.o uefirtvariable.o uefirtmisc.o securebootcert.o uefivarinfo.o -Llib/src -lfwts -L../src/acpica -lfwtsacpica
libtool: link: gcc -g -O2 -o .libs/fwts main.o ac_adapter.o acpidump.o acpiinfo.o acpitables.o apicinstance.o battery.o brightness-helper.o brightness.o autobrightness.o checksum.o crsdump.o prsdump.o cstates.o dmar.o fadt.o fan.o lid.o mcfg.o method.o osilinux.o pcc.o powerbutton.o s3.o s3power.o s4.o syntaxcheck.o wakealarm.o wmi.o apicedge.o bios_info.o bios32.o ebda_region.o ebdadump.o hdaaudio.o memmapdump.o mtrr.o mpcheck.o mpdump.o os2gap.o pciirq.o pnp.o romdump.o cmosdump.o virt.o virt_svm.o virt_vmx.o maxfreq.o cpufreq.o nx.o msr.o microcode.o dmicheck.o hotkey.o hpet_check.o klog.o oops.o version.o aspm.o crs.o maxreadreq.o csm.o uefidump.o uefirttime.o uefirtvariable.o uefirtmisc.o securebootcert.o uefivarinfo.o -Llib/src -L../../../src/acpica/source/compiler -L../src/acpica /tmp/fwts-test/new/fwts/src/acpica/.libs/libfwtsacpica.so -L../../src/lib/src /tmp/fwts-test/new/fwts/src/lib/src/.libs/libfwts.so -lm -lpcre -ljson /tmp/fwts-test/new/fwts/src/acpica/source/compiler/.libs/libfwtsiasl.so -lpthread -lrt -Wl,-rpath -Wl,/usr/local/lib/fwts
/usr/bin/ld: syntaxcheck.o: undefined reference to symbol 'json_object_array_get_idx'
/usr/bin/ld: note: 'json_object_array_get_idx' is defined in DSO /lib64/libjson-c.so.2 so try adding it to the linker command line
/lib64/libjson-c.so.2: could not read symbols: Invalid operation
Adding -ljson-c to LDFLAGS for fwts, libfwts_la, and kernelscan fixes the issue. I have tested the fix with the V13.12.00 as well as current git (commit: b98b1b1915a921855a3c52cba9f23ec24f9e75de - Jan 3, 2014) I have not however tried it on an Ubuntu release as of yet.
Thanks Mike, we'll sort that out next week.