Backport leveldb build integration to 0.12

This is a cherry-pick of a4625acb with minor conflict
resolution.

Conflicts:
	src/Makefile.am

=====

leveldb: integrate leveldb into our buildsystem

leveldb's buildsystem causes us a few problems:
- breaks out-of-tree builds
- forces flags used for some tools
- limits cross builds

Rather than continuing to add wrappers around it, simply integrate it into our
build.

1 files changed, 19 insertions, 3 deletions

diff --git a/configure.ac b/configure.ac
index e2056ee753..05e7266a8a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -252,7 +252,7 @@ case $host in
      fi
 
      CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB"
-     LEVELDB_TARGET_FLAGS="TARGET_OS=OS_WINDOWS_CROSSCOMPILE"
+     LEVELDB_TARGET_FLAGS="-DOS_WINDOWS"
      if test "x$CXXFLAGS_overridden" = "xno"; then
        CXXFLAGS="$CXXFLAGS -w"
      fi
@@ -274,7 +274,7 @@ case $host in
      ;;
   *darwin*)
      TARGET_OS=darwin
-     LEVELDB_TARGET_FLAGS="TARGET_OS=Darwin"
+     LEVELDB_TARGET_FLAGS="-DOS_MACOSX"
      if  test x$cross_compiling != xyes; then
        BUILD_OS=darwin
        AC_CHECK_PROG([PORT],port, port)
@@ -336,9 +336,11 @@ case $host in
      OBJCXXFLAGS="$CXXFLAGS"
      ;;
    *linux*)
-     TARGET_OS=linux
+     LEVELDB_TARGET_FLAGS="-DOS_LINUX"
      ;;
    *)
+     OTHER_OS=`echo ${host_os} | awk '{print toupper($0)}'`
+     LEVELDB_TARGET_FLAGS="-DOS_${OTHER_OS}"
      ;;
 esac
 
@@ -523,6 +525,18 @@ if test x$use_reduce_exports = xyes; then
   [AC_MSG_ERROR([Cannot set default symbol visibility. Use --disable-reduce-exports.])])
 fi
 
+dnl This can go away when we require c++11
+TEMP_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -std=c++0x"
+AC_MSG_CHECKING(for c++11 atomics)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+  #include <atomic>
+  ]],[[]])],
+  [ AC_MSG_RESULT(yes); LEVELDB_ATOMIC_CPPFLAGS="-DLEVELDB_ATOMIC_PRESENT"; LEVELDB_ATOMIC_CXXFLAGS="-std=c++0x"],
+  [ AC_MSG_RESULT(no)]
+)
+CXXFLAGS="$TEMP_CXXFLAGS"
+
 LEVELDB_CPPFLAGS=
 LIBLEVELDB=
 LIBMEMENV=
@@ -940,6 +954,8 @@ AC_SUBST(TESTDEFS)
 AC_SUBST(LEVELDB_TARGET_FLAGS)
 AC_SUBST(MINIUPNPC_CPPFLAGS)
 AC_SUBST(MINIUPNPC_LIBS)
+AC_SUBST(LEVELDB_ATOMIC_CPPFLAGS)
+AC_SUBST(LEVELDB_ATOMIC_CXXFLAGS)
 AC_CONFIG_FILES([Makefile src/Makefile share/setup.nsi share/qt/Info.plist src/test/buildenv.py])
 AC_CONFIG_FILES([qa/pull-tester/run-bitcoind-for-test.sh],[chmod +x qa/pull-tester/run-bitcoind-for-test.sh])
 AC_CONFIG_FILES([qa/pull-tester/tests_config.py],[chmod +x qa/pull-tester/tests_config.py])