server: Revert "Report backtraces in codemodel response"

The backtrace information is very repetitive and hugely increases the
size of the codemodel object.  We need to remove it until an alternative
representation can be developed.  Revert commit v3.10.0-rc1~393^2
(server: Report backtraces in codemodel response, 2017-06-20), except
for the protocol version number (because it indicates other new things).

Unfortunately this is incompatible with clients that expect the
"crossReferences" field in targets.  However, the regression in memory
usage is quite serious, especially on large projects, and therefore
breaks even older clients that do not use backtraces.  Since the
"crossReferences" field was only provided by one release (3.10.0), it is
simplest to revert it outright for 3.10.1.

Fixes: #17502

1 files changed, 0 insertions, 5 deletions

diff --git a/Source/cmServerDictionary.h b/Source/cmServerDictionary.h
index 405ff6b..e6a7ae6 100644
--- a/Source/cmServerDictionary.h
+++ b/Source/cmServerDictionary.h
@@ -89,11 +89,6 @@ static const std::string kWARN_UNUSED_KEY = "warnUnused";
 static const std::string kWATCHED_DIRECTORIES_KEY = "watchedDirectories";
 static const std::string kWATCHED_FILES_KEY = "watchedFiles";
 
-static const std::string kTARGET_CROSS_REFERENCES_KEY = "crossReferences";
-static const std::string kLINE_NUMBER_KEY = "line";
-static const std::string kBACKTRACE_KEY = "backtrace";
-static const std::string kRELATED_STATEMENTS_KEY = "relatedStatements";
-
 static const std::string kSTART_MAGIC = "[== \"CMake Server\" ==[";
 static const std::string kEND_MAGIC = "]== \"CMake Server\" ==]";