CI: Explain useful side effects of "-D" and "-J". [skip ci]

1 files changed, 7 insertions, 0 deletions

diff --git a/build.sh b/build.sh
index 40ffbace..3588f81c 100755
--- a/build.sh
+++ b/build.sh
@@ -89,8 +89,15 @@ fi
 run_after_echo make install
 print_so_deps "$TCPDUMP_BIN"
 run_after_echo "$TCPDUMP_BIN" -h
+# The "-D" flag depends on HAVE_PCAP_FINDALLDEVS and it would not be difficult
+# to run the command below only if the macro is defined.  That said, it seems
+# more useful to run it anyway: every system that currently runs this script
+# has pcap_findalldevs(), thus if the macro isn't defined, it means something
+# went wrong in the build process (as was observed with GCC, CMake and the
+# system libpcap on Solaris 11).
 run_after_echo "$TCPDUMP_BIN" -D
 if [ "$CIRRUS_CI" = true ]; then
+    # Likewise for the "-J" flag and HAVE_PCAP_SET_TSTAMP_TYPE.
     run_after_echo sudo \
         ${LD_LIBRARY_PATH:+LD_LIBRARY_PATH="$LD_LIBRARY_PATH"} \
         "$TCPDUMP_BIN" -J