expand automagic configuration

bdb.h

@@ -5,12 +5,7 @@
 #include <ruby.h>
 #include <version.h>
 #include <extconf.h>
-
-#ifdef INC_DB4
-#include <db4/db.h>
-#else
 #include <db.h>
-#endif
 
 #define NOTXN NULL
 

extconf.rb

@@ -4,13 +4,44 @@ require 'mkmf'
 
 target="bdb2"
 
+$distcleanfiles=["bdb_aux._c"]
+
+
+def usage
+  $stderr.puts "
+
+Options:
+
+ --va build an alternate output bdb2a, use this to avoid overwriting a
+      previous bdb2 library, since R0.3 the interfaces are not
+      compatible due to the addition of transaction parameters to many
+      calls. Note the impact on indicating the include, below.
+      If you have not used bdb2 before, you need not use this argument.
+
+ -h,--help this
+
+ --dbh {dir for db.h}
+      If we cannot find the right db.h automatically, use this to
+      indicate where to look. Do not use --with... because we need
+      to find the file itself to extract all the DB defines.
+
+"
+end
+
 opts = GetoptLong.new(
-                      [ "--va", GetoptLong::NO_ARGUMENT]
+                      [ "--va", GetoptLong::NO_ARGUMENT],
+                      [ "-h","--help",GetoptLong::NO_ARGUMENT],
+                      [ "--dbh", GetoptLong::REQUIRED_ARGUMENT]
                       )
 opts.each do |opt,arg|
   case opt
   when '--va'
     target="bdb2a"
+  when '-h','--help'
+    usage
+    exit
+  when '--dbh'
+    $dbh_location=arg
   end
 end
 
@@ -31,46 +62,106 @@ inc_dir,lib_dir = dir_config(target)
 
 $stderr.puts("lib_dir=#{lib_dir} inc_dir=#{inc_dir}")
 
+
 #case Config::CONFIG["arch"]
 #when /solaris2/
 #  $DLDFLAGS ||= ""
 #  $DLDFLAGS += " -R#{lib_dir}"
 #end
 
+$libs << " -lpthread"
+
 versions=%w(db-4.3 db-4.2)
-locations=%w(/usr/local/lib /opt/local/lib /usr/local/BerkeleyDB.4.2/lib /usr/local/BerkeleyDB.4.3/lib)
+locations=%w(/usr/local/lib /opt/local/lib /usr/local/BerkeleyDB.4.3/lib /usr/local/BerkeleyDB.4.2/lib)
 until versions.empty?
   (lib_ok=find_library(this_version=versions.shift,'db_create',*locations)) && break
 end
 
-h_locations=%w(/usr/local/include /opt/local/include /usr/local/BerkeleyDB.4.2/include /usr/local/BerkeleyDB.4.3/include)
-h_headers=%w(db4/db.h db.h)
-until h_headers.empty?
- (inc_ok=find_header(this_h=h_headers.shift,*h_locations)) && break
+$maj,$min=0,0
+if try_link0(<<SRC)
+#include <db.h>
+#include <stdio.h>
+main() {
+int maj,min;
+db_version(&maj,&min,NULL);
+printf("%d %d",maj,min);
+}
+SRC
+  xpopen("./conftest") do |f|
+  $maj,$min=f.gets.chomp.split.collect {|v| v.to_i}
   end
-puts "db header is #{this_h} #{inc_ok} #$INCFLAGS"
-
-if this_h == "db4/db.h"
-  $defs << "-DINC_DB4"
+  rm_f("conftest*")
 else
-  $defs << "-UINC_DB4"
+  message("unable to compile against found DB library\n")
+  exit
 end
 
-puts "defs: "+$defs.inspect
+message("Found DB version #{$maj}.#{$min}\n")
 
+def check_header dir
+  opt=if dir; "-I#{dir}".quote; else nil; end
+  hmaj=hmin=nil
+  if try_cpp(cpp_include("db.h"),opt)
+    if (hmaj=try_constant("DB_VERSION_MAJOR","db.h",opt)) and
+        (hmin=try_constant("DB_VERSION_MINOR","db.h",opt)) and
+        hmaj.to_i == $maj and hmin.to_i == $min
+      message("Found matching db.h with #{opt}\n")
+      $INCFLAGS << " " << opt
+      $db_inc=dir
+      return true
+    else
+      if hmaj
+        message("found a db.h, but wrong version (lib) #{$maj}.#{$min} != (db.h) #{hmaj}.#{hmin}\n")
+      end
+    end
+  end
+  false
+end
+
+# All systems seem to have a default db.h, so this is more selective
+h_test_locations=%w(
+ /usr/local/include
+ /opt/local/include
+ /usr/local
+)
+h_test_locations.unshift($dbh_location) if $dbh_location
+message("Header test locations are #{h_test_locations.inspect}\n")
+found=false
+$db_inc=nil
+
+# Find possible headers first:
+require 'find'
+Find.find(*h_test_locations) do |p1|
+  if FileTest.directory?(p1)
+    Find.prune if File.basename(p1)[0] == ?.
+  else
+    if File.basename(p1) == 'db.h'
+      break if found=check_header(File.dirname(p1))
+    end
+  end
+end
+
+unless found
+  usage
+  message("\nUnable to find db.h to match library (#{maj}.#{min})\n")
+  exit 4
+end
+
+# This is an alternate way of find headers, by makedepend
+# support of gcc. It is not as necessary as we could just use
+# the above result, but it is another check.
 # Find db.h, not sure this will work everywhere, gcc is ok
-src=create_tmpsrc("#include <#{this_h}>")
+src=create_tmpsrc("#include <db.h>")
 cmd=cpp_command("-M")
 r=`#{cmd}`
 header_loc=r.split.collect {|k| k if k =~ %r{^/.*db.h} }.compact[0]
 message("header is #{header_loc}\n")
 
-
-inc="#include <#{this_h}>"
+inc="#include <db.h>"
 n=0
 message("Writing bdb_aux._c (defines), this takes a while\n")
 defines=[]
-File.open(header_loc) {|fd|
+File.open(File.join($db_inc,"db.h")) {|fd|
   File.open("bdb_aux._c","w") {|hd|
     hd.puts("/* This file automatically generated by extconf.rb */\n")
     fd.each_line {|l|
@@ -90,7 +181,7 @@ File.open(header_loc) {|fd|
 
 $defs << $INCFLAGS
 
-if lib_ok and inc_ok
+if lib_ok
   create_header
   create_makefile(target)
 else