Convert lmdb check to m4 macro

diff --git a/aclocal.m4 b/aclocal.m4
index 167140bbebc42ca84baa36022edc5349cf4ef66b..fa9e0bf9fb69455423a742cb7408b44980f440ad 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -376,6 +376,7 @@ AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 
 m4_include([m4/ax_check_compile_flag.m4])
 m4_include([m4/ax_check_openssl.m4])
+m4_include([m4/ax_lib_lmdb.m4])
 m4_include([m4/ax_posix_shell.m4])
 m4_include([m4/ax_pthread.m4])
 m4_include([m4/ax_restore_flags.m4])

diff --git a/config.h.in b/config.h.in
index 463841adbcb520566aa194e279cfc384e2fa8f4c..449ce58765606b77a14f6949668657066eedfef2 100644 (file)
--- a/config.h.in
+++ b/config.h.in
@@ -261,7 +261,7 @@
 /* Define to 1 if you have the <linux/rtnetlink.h> header file. */
 #undef HAVE_LINUX_RTNETLINK_H
 
-/* Define if lmdb was found */
+/* Use lmdb library */
 #undef HAVE_LMDB
 
 /* Define to 1 if you have the <locale.h> header file. */

diff --git a/configure b/configure
index 063b66062224da7666b65f8a1c0b2bbc2c5bd04a..69ed062df39c6f7e4eea33fef2b4b3b63b71ef16 100755 (executable)
--- a/configure
+++ b/configure
@@ -733,6 +733,9 @@ LIBXML2_CFLAGS
 NZDTARGETS
 NZDSRCS
 NZD_TOOLS
+LMDB_LDFLAGS
+LMDB_LIBS
+LMDB_CFLAGS
 DNS_CRYPTO_LIBS
 DNS_GSSAPI_LIBS
 DST_GSSAPI_INC
@@ -970,6 +973,8 @@ LIBUV_CFLAGS
 LIBUV_LIBS
 OPENSSL_CFLAGS
 OPENSSL_LIBS
+LMDB_CFLAGS
+LMDB_LIBS
 LIBXML2_CFLAGS
 LIBXML2_LIBS
 JSON_C_CFLAGS
@@ -1663,7 +1668,8 @@ Optional Packages:
   --with-gssapi=PATH|/path/krb5-config
                           Specify path for system-supplied GSSAPI
                           [default=auto]
-  --with-lmdb=PATH        build with LMDB library [yes|no|path]
+  --with-lmdb=[PATH]      use LMDB library [default=auto], optionally specify
+                          the prefix for lmdb library
   --with-libxml2          build with libxml2 library [yes|no|auto] (default is
                           auto)
   --with-libjson          deprecated, use --with-json-c
@@ -1732,6 +1738,8 @@ Some influential environment variables:
               C compiler flags for OPENSSL, overriding pkg-config
   OPENSSL_LIBS
               linker flags for OPENSSL, overriding pkg-config
+  LMDB_CFLAGS C compiler flags for LMDB, overriding pkg-config
+  LMDB_LIBS   linker flags for LMDB, overriding pkg-config
   LIBXML2_CFLAGS
               C compiler flags for LIBXML2, overriding pkg-config
   LIBXML2_LIBS
@@ -17514,53 +17522,96 @@ DNS_CRYPTO_LIBS="$DNS_GSSAPI_LIBS"
 #
 # was --with-lmdb specified?
 #
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for lmdb library" >&5
-$as_echo_n "checking for lmdb library... " >&6; }
+
 
 # Check whether --with-lmdb was given.
 if test "${with_lmdb+set}" = set; then :
-  withval=$with_lmdb; use_lmdb="$withval"
+  withval=$with_lmdb; :
 else
-  use_lmdb="auto"
+  with_lmdb="auto"
 fi
 
 
-have_lmdb=""
-case "$use_lmdb" in
-       no)
-               lmdb_libs=""
-               ;;
-       auto|yes)
-               for d in /usr /usr/local /opt/local
-               do
-                       if test -f "${d}/include/lmdb.h"
-                       then
-                               if test ${d} != /usr
-                               then
-                                       lmdb_cflags="-I ${d}/include"
-                                       LIBS="$LIBS -L${d}/lib"
-                               fi
-                               have_lmdb="yes"
-                       fi
-               done
-               ;;
-       *)
-               if test -f "${use_lmdb}/include/lmdb.h"
-               then
-                       lmdb_cflags="-I${use_lmdb}/include"
-                       LIBS="$LIBS -L${use_lmdb}/lib"
-                       have_lmdb="yes"
-               else
-                       as_fn_error $? "$use_lmdb/include/lmdb.h not found." "$LINENO" 5
-               fi
-               ;;
-esac
+ac_lib_lmdb_found=no
+case $with_lmdb in #(
+  no) :
+     ;; #(
+  auto|yes) :
 
-if test "X${have_lmdb}" != "X"
-then
-       { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+pkg_failed=no
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for lmdb" >&5
+$as_echo_n "checking for lmdb... " >&6; }
+
+if test -n "$LMDB_CFLAGS"; then
+    pkg_cv_LMDB_CFLAGS="$LMDB_CFLAGS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"lmdb\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "lmdb") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_LMDB_CFLAGS=`$PKG_CONFIG --cflags "lmdb" 2>/dev/null`
+                     test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+if test -n "$LMDB_LIBS"; then
+    pkg_cv_LMDB_LIBS="$LMDB_LIBS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"lmdb\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "lmdb") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_LMDB_LIBS=`$PKG_CONFIG --libs "lmdb" 2>/dev/null`
+                     test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+
+
+
+if test $pkg_failed = yes; then
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi
+        if test $_pkg_short_errors_supported = yes; then
+               LMDB_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "lmdb" 2>&1`
+        else
+               LMDB_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "lmdb" 2>&1`
+        fi
+       # Put the nasty error message in config.log where it belongs
+       echo "$LMDB_PKG_ERRORS" >&5
+
+       for ac_lib_lmdb_path in /usr /usr/local /opt /opt/local; do
+                                               if test -z "$ac_lib_lmdb_path"; then :
+  as_fn_error $? "Path cannot be empty" "$LINENO" 5
+fi
+         { $as_echo "$as_me:${as_lineno-$LINENO}: checking for lmdb header in $ac_lib_lmdb_path" >&5
+$as_echo_n "checking for lmdb header in $ac_lib_lmdb_path... " >&6; }
+         if test -r "$ac_lib_lmdb_path/include/lmdb.h"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-       { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing mdb_env_create" >&5
+                LMDB_CFLAGS="-I$ac_lib_lmdb_path/include"
+                LMDB_LIBS="-L$ac_lib_lmdb_path/lib"
+                saved_CFLAGS="$CFLAGS"
+                saved_LIBS="$LIBS"
+                CFLAGS="$CFLAGS $LMDB_CFLAGS"
+                LIBS="$LIBS $LMDB_LIBS"
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing mdb_env_create" >&5
 $as_echo_n "checking for library containing mdb_env_create... " >&6; }
 if ${ac_cv_search_mdb_env_create+:} false; then :
   $as_echo_n "(cached) " >&6
@@ -17613,32 +17664,250 @@ $as_echo "$ac_cv_search_mdb_env_create" >&6; }
 ac_res=$ac_cv_search_mdb_env_create
 if test "$ac_res" != no; then :
   test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+  LMDB_LIBS="$LMDB_LIBS $ac_cv_search_mdb_env_create"
+
+
+                                ac_lib_lmdb_found=yes
+                                                            break
 
 else
-  as_fn_error $? "found lmdb include but not library." "$LINENO" 5
-                       have_lmdb=""
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+                                LMDB_CFLAGS=""
+                                LMDB_LIBS=""
+
+
 fi
 
-elif test "X$use_lmdb" = Xyes
-then
-       as_fn_error $? "include/lmdb.h not found." "$LINENO" 5
+                CFLAGS="$saved_CFLAGS"
+                LIBS="$saved_LIBS"
+
 else
-       { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
 fi
+                                       done
 
-NZD_TOOLS=""
-NZDSRCS=
-NZDTARGETS=
-if test "X${have_lmdb}" != "X"
-then
-       CFLAGS="$CFLAGS $lmdb_cflags"
+elif test $pkg_failed = untried; then
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+       for ac_lib_lmdb_path in /usr /usr/local /opt /opt/local; do
+                                               if test -z "$ac_lib_lmdb_path"; then :
+  as_fn_error $? "Path cannot be empty" "$LINENO" 5
+fi
+         { $as_echo "$as_me:${as_lineno-$LINENO}: checking for lmdb header in $ac_lib_lmdb_path" >&5
+$as_echo_n "checking for lmdb header in $ac_lib_lmdb_path... " >&6; }
+         if test -r "$ac_lib_lmdb_path/include/lmdb.h"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+                LMDB_CFLAGS="-I$ac_lib_lmdb_path/include"
+                LMDB_LIBS="-L$ac_lib_lmdb_path/lib"
+                saved_CFLAGS="$CFLAGS"
+                saved_LIBS="$LIBS"
+                CFLAGS="$CFLAGS $LMDB_CFLAGS"
+                LIBS="$LIBS $LMDB_LIBS"
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing mdb_env_create" >&5
+$as_echo_n "checking for library containing mdb_env_create... " >&6; }
+if ${ac_cv_search_mdb_env_create+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char mdb_env_create ();
+int
+main ()
+{
+return mdb_env_create ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' lmdb; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_mdb_env_create=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_mdb_env_create+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_mdb_env_create+:} false; then :
+
+else
+  ac_cv_search_mdb_env_create=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_mdb_env_create" >&5
+$as_echo "$ac_cv_search_mdb_env_create" >&6; }
+ac_res=$ac_cv_search_mdb_env_create
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+  LMDB_LIBS="$LMDB_LIBS $ac_cv_search_mdb_env_create"
+
+
+                                ac_lib_lmdb_found=yes
+                                                            break
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+                                LMDB_CFLAGS=""
+                                LMDB_LIBS=""
+
+
+fi
+
+                CFLAGS="$saved_CFLAGS"
+                LIBS="$saved_LIBS"
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+                                       done
+
+else
+       LMDB_CFLAGS=$pkg_cv_LMDB_CFLAGS
+       LMDB_LIBS=$pkg_cv_LMDB_LIBS
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+       ac_lib_lmdb_found=yes
+fi ;; #(
+  *) :
+    if test -z "$with_lmdb"; then :
+  as_fn_error $? "Path cannot be empty" "$LINENO" 5
+fi
+         { $as_echo "$as_me:${as_lineno-$LINENO}: checking for lmdb header in $with_lmdb" >&5
+$as_echo_n "checking for lmdb header in $with_lmdb... " >&6; }
+         if test -r "$with_lmdb/include/lmdb.h"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+                LMDB_CFLAGS="-I$with_lmdb/include"
+                LMDB_LIBS="-L$with_lmdb/lib"
+                saved_CFLAGS="$CFLAGS"
+                saved_LIBS="$LIBS"
+                CFLAGS="$CFLAGS $LMDB_CFLAGS"
+                LIBS="$LIBS $LMDB_LIBS"
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing mdb_env_create" >&5
+$as_echo_n "checking for library containing mdb_env_create... " >&6; }
+if ${ac_cv_search_mdb_env_create+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char mdb_env_create ();
+int
+main ()
+{
+return mdb_env_create ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' lmdb; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_mdb_env_create=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_mdb_env_create+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_mdb_env_create+:} false; then :
+
+else
+  ac_cv_search_mdb_env_create=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_mdb_env_create" >&5
+$as_echo "$ac_cv_search_mdb_env_create" >&6; }
+ac_res=$ac_cv_search_mdb_env_create
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+  LMDB_LIBS="$LMDB_LIBS $ac_cv_search_mdb_env_create"
+
+
+                                ac_lib_lmdb_found=yes
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+                                LMDB_CFLAGS=""
+                                LMDB_LIBS=""
+
+
+fi
+
+                CFLAGS="$saved_CFLAGS"
+                LIBS="$saved_LIBS"
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi ;;
+esac
+
+# don't fail when in automatic mode
+if test "$with_lmdb" = "auto" && test "$ac_lib_lmdb_found" = "no"; then :
+  with_lmdb=no
+fi
+
+# hard fail when LMDB requested, but not found
+if test "$with_lmdb" != "no" && test "$ac_lib_lmdb_found" != "yes"; then :
+  as_fn_error $? "LMDB requested, but not found" "$LINENO" 5
+fi
+
+if test "$ac_lib_lmdb_found" = "yes"; then :
 
 $as_echo "#define HAVE_LMDB 1" >>confdefs.h
 
-       NZD_TOOLS="nzd"
-       NZDSRCS='${NZDSRCS}'
-       NZDTARGETS='${NZDTARGETS}'
+fi
+
+
+
+#AM_CONDITIONAL([HAVE_LMDB], [test "$ac_lib_lmdb_found" = "yes"])
+
+NZD_TOOLS=
+NZDSRCS=
+NZDTARGETS=
+if test -n "$LMDB_LIBS"; then :
+  NZD_TOOLS="nzd"
+       NZDSRCS='${NZDSRCS}'
+       NZDTARGETS='${NZDTARGETS}'
 fi
 
 

diff --git a/configure.ac b/configure.ac
index 0f051587b4414ed3388d566820b2735b3007d074..d2a94e1c0a3242f4e369e4e59c5a34d0af25dc41 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1168,70 +1168,51 @@ AC_SUBST(DNS_CRYPTO_LIBS)
 #
 # was --with-lmdb specified?
 #
-AC_MSG_CHECKING(for lmdb library)
-AC_ARG_WITH(lmdb,
-           AS_HELP_STRING([--with-lmdb[=PATH]],
-                          [build with LMDB library [yes|no|path]]),
-    use_lmdb="$withval", use_lmdb="auto")
-
-have_lmdb=""
-case "$use_lmdb" in
-       no)
-               lmdb_libs=""
-               ;;
-       auto|yes)
-               for d in /usr /usr/local /opt/local
-               do
-                       if test -f "${d}/include/lmdb.h"
-                       then
-                               if test ${d} != /usr
-                               then
-                                       lmdb_cflags="-I ${d}/include"
-                                       LIBS="$LIBS -L${d}/lib"
-                               fi
-                               have_lmdb="yes"
-                       fi
-               done
-               ;;
-       *)
-               if test -f "${use_lmdb}/include/lmdb.h"
-               then
-                       lmdb_cflags="-I${use_lmdb}/include"
-                       LIBS="$LIBS -L${use_lmdb}/lib"
-                       have_lmdb="yes"
-               else
-                       AC_MSG_ERROR([$use_lmdb/include/lmdb.h not found.])
-               fi
-               ;;
-esac
 
-if test "X${have_lmdb}" != "X"
-then
-       AC_MSG_RESULT(yes)
-       AC_SEARCH_LIBS([mdb_env_create], [lmdb], [],
-                      [AC_MSG_ERROR([found lmdb include but not library.])
-                       have_lmdb=""])
-elif test "X$use_lmdb" = Xyes
-then
-       AC_MSG_ERROR([include/lmdb.h not found.])
-else
-       AC_MSG_RESULT(no)
-fi
+AC_ARG_WITH([lmdb],
+           [AS_HELP_STRING([--with-lmdb=@<:@PATH@:>@],
+                           [use LMDB library @<:@default=auto@:>@, optionally specify the prefix for lmdb library])],
+           [:],
+           [with_lmdb="auto"])
 
-NZD_TOOLS=""
+ac_lib_lmdb_found=no
+AS_CASE([$with_lmdb],
+       [no],[],
+       [auto|yes], [PKG_CHECK_MODULES([LMDB], [lmdb],
+                                      [ac_lib_lmdb_found=yes],
+                                      [for ac_lib_lmdb_path in /usr /usr/local /opt /opt/local; do
+                                               AX_LIB_LMDB([$ac_lib_lmdb_path],
+                                                           [ac_lib_lmdb_found=yes
+                                                            break])
+                                       done
+                                      ])],
+       [AX_LIB_LMDB([$with_lmdb],[ac_lib_lmdb_found=yes])])
+
+# don't fail when in automatic mode
+AS_IF([test "$with_lmdb" = "auto" && test "$ac_lib_lmdb_found" = "no"],
+      [with_lmdb=no])
+
+# hard fail when LMDB requested, but not found
+AS_IF([test "$with_lmdb" != "no" && test "$ac_lib_lmdb_found" != "yes"],
+      [AC_MSG_ERROR([LMDB requested, but not found])])
+
+AS_IF([test "$ac_lib_lmdb_found" = "yes"],
+      [AC_DEFINE([HAVE_LMDB], [1], [Use lmdb library])])
+
+AC_SUBST([LMDB_CFLAGS])
+AC_SUBST([LMDB_LIBS])
+#AM_CONDITIONAL([HAVE_LMDB], [test "$ac_lib_lmdb_found" = "yes"])
+
+NZD_TOOLS=
 NZDSRCS=
 NZDTARGETS=
-if test "X${have_lmdb}" != "X"
-then
-       CFLAGS="$CFLAGS $lmdb_cflags"
-       AC_DEFINE(HAVE_LMDB, 1, [Define if lmdb was found])
-       NZD_TOOLS="nzd"
-       NZDSRCS='${NZDSRCS}'
-       NZDTARGETS='${NZDTARGETS}'
-fi
-AC_SUBST(NZD_TOOLS)
-AC_SUBST(NZDSRCS)
-AC_SUBST(NZDTARGETS)
+AS_IF([test -n "$LMDB_LIBS"],
+      [NZD_TOOLS="nzd"
+       NZDSRCS='${NZDSRCS}'
+       NZDTARGETS='${NZDTARGETS}'])
+AC_SUBST([NZD_TOOLS])
+AC_SUBST([NZDSRCS])
+AC_SUBST([NZDTARGETS])
 
 #
 # was --with-libxml2 specified?

diff --git a/m4/ax_lib_lmdb.m4 b/m4/ax_lib_lmdb.m4
new file mode 100644 (file)
index 0000000..0895a9d
--- /dev/null
+++ b/m4/ax_lib_lmdb.m4
@@ -0,0 +1,58 @@
+# ===========================================================================
+#      https://gitlab.isc.org/isc-projects/autoconf-archive/ax_lib_lmdb.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_LIB_LMDB(PATH[, ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+#
+# DESCRIPTION
+#
+#   Test for the LMDB library in a path
+#
+#   This macro takes only one argument, a path to the lmdb headers and library.
+#
+#   This macro calls:
+#
+#     AC_SUBST(LMDB_CFLAGS)
+#     AC_SUBST(LMDB_LDFLAGS)
+#
+# LICENSE
+#
+#   Copyright (c) 2020 Internet Systems Consortium
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 19
+
+#
+AC_DEFUN([AX_LIB_LMDB],
+        [AS_IF([test -z "$1"],
+               [AC_MSG_ERROR([Path cannot be empty])])
+         AC_MSG_CHECKING([for lmdb header in $1])
+         AS_IF([test -r "$1/include/lmdb.h"],
+               [AC_MSG_RESULT([yes])
+                LMDB_CFLAGS="-I$1/include"
+                LMDB_LIBS="-L$1/lib"
+                saved_CFLAGS="$CFLAGS"
+                saved_LIBS="$LIBS"
+                CFLAGS="$CFLAGS $LMDB_CFLAGS"
+                LIBS="$LIBS $LMDB_LIBS"
+                AC_SEARCH_LIBS([mdb_env_create], [lmdb],
+                               [LMDB_LIBS="$LMDB_LIBS $ac_cv_search_mdb_env_create"
+                                AC_SUBST([LMDB_CFLAGS])
+                                AC_SUBST([LMDB_LDFLAGS])
+                                $2
+                               ],
+                               [AC_MSG_RESULT([no])
+                                LMDB_CFLAGS=""
+                                LMDB_LIBS=""
+                                $3
+                               ])
+                CFLAGS="$saved_CFLAGS"
+                LIBS="$saved_LIBS"
+               ],
+               [AC_MSG_RESULT([no])])])