configure: add an option to enable debug build, i.e -g (#1929)

Add this new flag to one CI job, to test it

Close #1925

.github/workflows/build_scheduled.yml

@@ -1,3 +1,4 @@
+name: Scheduled builds
 on:
   workflow_dispatch:
   schedule:
@@ -56,7 +57,7 @@ jobs:
           sudo apt-get install autoconf automake libtool pkg-config gettext flex bison doxygen
       - name: Configure nDPI library
         run: |
-          ./autogen.sh --with-only-libndpi --enable-option-checking=fatal
+          ./autogen.sh --with-only-libndpi --enable-option-checking=fatal --enable-debug-build
       - name: Generate Documentation
         run: |
           pip install --upgrade pip

configure.ac

@@ -27,13 +27,18 @@ AC_ARG_ENABLE(tls-sigs, AS_HELP_STRING([--enable-tls-sigs], [Enable TLS Client s
 AC_ARG_ENABLE(npcap, AS_HELP_STRING([--disable-npcap], [msys2 only: Disable linkage against the wpcap/npcap import library in windows/WpdPack/Lib.]))
 AC_ARG_WITH(nbpf-path, AS_HELP_STRING([--with-nbpf-path], [nBPF library custom path; default: ${PWD}/../PF_RING/userland/nbpf]),[NBPF_HOME=$withval],[NBPF_HOME=${PWD}/../PF_RING/userland/nbpf])
 AC_ARG_WITH(lto-and-gold-linker, AS_HELP_STRING([--with-lto-and-gold-linker], [Build with LTO and Gold linker]))
+AC_ARG_ENABLE(debug-build, AS_HELP_STRING([--enable-debug-build], [Enable debug build (`-g` flag)]),[enable_debugbuild=$enableval],[enable_debugbuild=no])
 
 AS_IF([test "x$enable_fuzztargets" = "xyes"], [
   BUILD_FUZZTARGETS=1
   NDPI_CFLAGS="${NDPI_CFLAGS} -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION"
 ], [BUILD_FUZZTARGETS=0])
 AM_CONDITIONAL([BUILD_FUZZTARGETS], [test "x$enable_fuzztargets" = "xyes"])
 
+AS_IF([test "x$enable_debugbuild" = "xyes"], [
+  NDPI_CFLAGS="${NDPI_CFLAGS} -g"
+])
+
 AS_IF([test "${with_sanitizer+set}" = set -a "${with_thread_sanitizer+set}" = set],[
   AC_MSG_ERROR([Configure options `--with-sanitizer' and `--with_thread_sanitizer' can not used at the same time.])
 ])