fix parsing "-inf" in config variables

The default for export-silence-threshold is -INFINITY, written
as "-inf" (by cfgtool) into system_config. Yet parsing the config using
a std::stringstream results in "0" (due to bugs in various libc++).

1 files changed, 4 insertions, 0 deletions

diff --git a/libs/pbd/pbd/configuration_variable.h b/libs/pbd/pbd/configuration_variable.h
index 6bdf0f7868..7af7974229 100644
--- a/libs/pbd/pbd/configuration_variable.h
+++ b/libs/pbd/pbd/configuration_variable.h
@@ -89,6 +89,10 @@ class /*LIBPBD_API*/ ConfigVariable : public ConfigVariableBase
 	T value;
 };
 
+/** Specialisation of ConfigVariable to deal with float (-inf etc) */
+template<> void
+ConfigVariable<float>::set_from_string (std::string const & s);
+
 /** Specialisation of ConfigVariable for std::string to cope with whitespace properly */
 template<>
 class /*LIBPBD_API*/ ConfigVariable<std::string> : public ConfigVariableBase