Use "#pragma once" to prevent repeated header file inclusion

32 files changed, 31 insertions, 166 deletions

diff --git a/.gitignore b/.gitignore
index d7f151507f9b..3fb96f124991 100644
--- a/.gitignore
+++ b/.gitignore
@@ -78,13 +78,9 @@ Makefile.in
 /src/libexpr/parser-tab.cc
 /src/libexpr/parser-tab.hh
 /src/libexpr/parser-tab.output
-/src/libexpr/nixexpr-ast.hh
-/src/libexpr/nixexpr-ast.cc
 /src/libexpr/nix.tbl
 
 # /src/libstore/
-/src/libstore/derivations-ast.cc
-/src/libstore/derivations-ast.hh
 /src/libstore/schema.sql.hh
 
 # /src/nix-env/
diff --git a/src/libexpr/attr-path.hh b/src/libexpr/attr-path.hh
index b106da5ef817..d3aad746116a 100644
--- a/src/libexpr/attr-path.hh
+++ b/src/libexpr/attr-path.hh
@@ -1,20 +1,13 @@
-#ifndef __ATTR_PATH_H
-#define __ATTR_PATH_H
+#pragma once
 
 #include "eval.hh"
 
 #include <string>
 #include <map>
 
-
 namespace nix {
 
-    
 void findAlongAttrPath(EvalState & state, const string & attrPath,
     Bindings & autoArgs, Expr * e, Value & v);
 
-    
 }
-
-
-#endif /* !__ATTR_PATH_H */
diff --git a/src/libexpr/common-opts.hh b/src/libexpr/common-opts.hh
index c28641e9015d..e2e3fe77171c 100644
--- a/src/libexpr/common-opts.hh
+++ b/src/libexpr/common-opts.hh
@@ -1,9 +1,7 @@
-#ifndef __COMMON_OPTS_H
-#define __COMMON_OPTS_H
+#pragma once
 
 #include "eval.hh"
 
-
 namespace nix {
 
 /* Some common option parsing between nix-env and nix-instantiate. */
@@ -17,6 +15,3 @@ bool parseSearchPathArg(const string & arg, Strings::iterator & i,
 Path lookupFileArg(EvalState & state, string s);
 
 }
-
-
-#endif /* !__COMMON_OPTS_H */
diff --git a/src/libexpr/eval-inline.hh b/src/libexpr/eval-inline.hh
index 6026a7d11015..57a9e4c63c21 100644
--- a/src/libexpr/eval-inline.hh
+++ b/src/libexpr/eval-inline.hh
@@ -1,5 +1,4 @@
-#ifndef __EVAL_INLINE_H
-#define __EVAL_INLINE_H
+#pragma once
 
 #include "eval.hh"
 
@@ -8,7 +7,6 @@
 
 namespace nix {
 
-
 LocalNoInlineNoReturn(void throwEvalError(const char * s))
 {
     throw EvalError(s);
@@ -55,7 +53,4 @@ inline void EvalState::forceList(Value & v)
         throwTypeError("value is %1% while a list was expected", showType(v));
 }
 
-
 }
-
-#endif /* !__EVAL_INLINE_H */
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index bab9303b08eb..5103ae8cefe9 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -1,5 +1,4 @@
-#ifndef __EVAL_H
-#define __EVAL_H
+#pragma once
 
 #include "value.hh"
 #include "nixexpr.hh"
@@ -256,6 +255,3 @@ string showType(const Value & v);
 
 
 }
-
-
-#endif /* !__EVAL_H */
diff --git a/src/libexpr/get-drvs.hh b/src/libexpr/get-drvs.hh
index 2d260c57beee..879dc8dbb45d 100644
--- a/src/libexpr/get-drvs.hh
+++ b/src/libexpr/get-drvs.hh
@@ -1,5 +1,4 @@
-#ifndef __GET_DRVS_H
-#define __GET_DRVS_H
+#pragma once
 
 #include "eval.hh"
 
@@ -78,6 +77,3 @@ void getDerivations(EvalState & state, Value & v, const string & pathPrefix,
 
  
 }
-
-
-#endif /* !__GET_DRVS_H */
diff --git a/src/libexpr/names.hh b/src/libexpr/names.hh
index e189302d6d94..ebe113e82ac1 100644
--- a/src/libexpr/names.hh
+++ b/src/libexpr/names.hh
@@ -1,12 +1,9 @@
-#ifndef __NAMES_H
-#define __NAMES_H
+#pragma once
 
 #include "types.hh"
 
-
 namespace nix {
 
-
 struct DrvName
 {
     string fullName;
@@ -19,15 +16,9 @@ struct DrvName
     bool matches(DrvName & n);
 };
 
-
 typedef list<DrvName> DrvNames;
 
-
 int compareVersions(const string & v1, const string & v2);
 DrvNames drvNamesFromArgs(const Strings & opArgs);
 
-
 }
-
-
-#endif /* !__NAMES_H */
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 6eb771a726b4..4c1a0bb2d5fb 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -1,5 +1,4 @@
-#ifndef __NIXEXPR_H
-#define __NIXEXPR_H
+#pragma once
 
 #include "value.hh"
 #include "symbol-table.hh"
@@ -290,6 +289,3 @@ struct StaticEnv
 
 
 }
-
-
-#endif /* !__NIXEXPR_H */
diff --git a/src/libexpr/symbol-table.hh b/src/libexpr/symbol-table.hh
index 976117a20a46..143fc495b04a 100644
--- a/src/libexpr/symbol-table.hh
+++ b/src/libexpr/symbol-table.hh
@@ -1,5 +1,4 @@
-#ifndef __SYMBOL_TABLE_H
-#define __SYMBOL_TABLE_H
+#pragma once
 
 #include "config.h"
 
@@ -88,5 +87,3 @@ public:
 };
 
 }
-
-#endif /* !__SYMBOL_TABLE_H */
diff --git a/src/libexpr/value-to-xml.hh b/src/libexpr/value-to-xml.hh
index 3ebc989ffa26..97657327edba 100644
--- a/src/libexpr/value-to-xml.hh
+++ b/src/libexpr/value-to-xml.hh
@@ -1,5 +1,4 @@
-#ifndef __VALUE_TO_XML_H
-#define __VALUE_TO_XML_H
+#pragma once
 
 #include "nixexpr.hh"
 #include "eval.hh"
@@ -13,5 +12,3 @@ void printValueAsXML(EvalState & state, bool strict, bool location,
     Value & v, std::ostream & out, PathSet & context);
     
 }
-
-#endif /* !__VALUE_TO_XML_H */
diff --git a/src/libexpr/value.hh b/src/libexpr/value.hh
index 41512d40b1e0..c9ec236c470d 100644
--- a/src/libexpr/value.hh
+++ b/src/libexpr/value.hh
@@ -1,5 +1,4 @@
-#ifndef __VALUE_H
-#define __VALUE_H
+#pragma once
 
 #include "symbol-table.hh"
 
@@ -151,5 +150,3 @@ void mkPath(Value & v, const char * s);
 
 
 }
-
-#endif /* !__VALUE_H */
diff --git a/src/libmain/shared.hh b/src/libmain/shared.hh
index d198df70d150..7849e10e3641 100644
--- a/src/libmain/shared.hh
+++ b/src/libmain/shared.hh
@@ -1,5 +1,4 @@
-#ifndef __SHARED_H
-#define __SHARED_H
+#pragma once
 
 #include "util.hh"
 
@@ -54,6 +53,3 @@ extern int exitCode;
 extern char * * argvSaved;
 
 }
-
-
-#endif /* !__SHARED_H */
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 27e471d885cc..8f22b4afa6a1 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -1,5 +1,4 @@
-#ifndef __DERIVATIONS_H
-#define __DERIVATIONS_H
+#pragma once
 
 #include <map>
 
@@ -81,6 +80,3 @@ typedef std::map<Path, Hash> DrvHashes;
 extern DrvHashes drvHashes;
 
 }
-
-
-#endif /* !__DERIVATIONS_H */
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 12a9b9ca15c0..1c0877a5e1e9 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -1,5 +1,4 @@
-#ifndef __GLOBALS_H
-#define __GLOBALS_H
+#pragma once
 
 #include "types.hh"
 
@@ -118,6 +117,3 @@ void setDefaultsFromEnvironment();
 
 
 }
-
-
-#endif /* !__GLOBALS_H */
diff --git a/src/libstore/local-store.hh b/src/libstore/local-store.hh
index 65ee029c261e..eb7705219ac7 100644
--- a/src/libstore/local-store.hh
+++ b/src/libstore/local-store.hh
@@ -1,5 +1,4 @@
-#ifndef __LOCAL_STORE_H
-#define __LOCAL_STORE_H
+#pragma once
 
 #include <string>
 
@@ -302,6 +301,3 @@ void deletePathWrapped(const Path & path,
 void deletePathWrapped(const Path & path);
  
 }
-
-
-#endif /* !__LOCAL_STORE_H */
diff --git a/src/libstore/misc.hh b/src/libstore/misc.hh
index 850c12af4ebc..fe0bbdd799d7 100644
--- a/src/libstore/misc.hh
+++ b/src/libstore/misc.hh
@@ -1,5 +1,4 @@
-#ifndef __MISC_H
-#define __MISC_H
+#pragma once
 
 #include "derivations.hh"
 
@@ -35,6 +34,3 @@ void queryMissing(StoreAPI & store, const PathSet & targets,
 
 
 }
-
-
-#endif /* !__MISC_H */
diff --git a/src/libstore/pathlocks.hh b/src/libstore/pathlocks.hh
index 57ca1584a6d6..8a6b1450da2a 100644
--- a/src/libstore/pathlocks.hh
+++ b/src/libstore/pathlocks.hh
@@ -1,5 +1,4 @@
-#ifndef __PATHLOCKS_H
-#define __PATHLOCKS_H
+#pragma once
 
 #include "types.hh"
 
@@ -44,6 +43,3 @@ bool pathIsLockedByMe(const Path & path);
 
 
 }
-
-
-#endif /* !__PATHLOCKS_H */
diff --git a/src/libstore/references.hh b/src/libstore/references.hh
index 158c08a77646..013809d122f3 100644
--- a/src/libstore/references.hh
+++ b/src/libstore/references.hh
@@ -1,5 +1,4 @@
-#ifndef __REFERENCES_H
-#define __REFERENCES_H
+#pragma once
 
 #include "types.hh"
 #include "hash.hh"
@@ -10,5 +9,3 @@ PathSet scanForReferences(const Path & path, const PathSet & refs,
     HashResult & hash);
     
 }
-
-#endif /* !__REFERENCES_H */
diff --git a/src/libstore/remote-store.hh b/src/libstore/remote-store.hh
index f0e5dbf7695a..c57b49ce15e4 100644
--- a/src/libstore/remote-store.hh
+++ b/src/libstore/remote-store.hh
@@ -1,5 +1,4 @@
-#ifndef __REMOTE_STORE_H
-#define __REMOTE_STORE_H
+#pragma once
 
 #include <string>
 
@@ -101,6 +100,3 @@ private:
 
 
 }
-
-
-#endif /* !__REMOTE_STORE_H */
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 0ab15c38063e..9ba67852efec 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -1,5 +1,4 @@
-#ifndef __STOREAPI_H
-#define __STOREAPI_H
+#pragma once
 
 #include "hash.hh"
 #include "serialise.hh"
@@ -356,6 +355,3 @@ MakeError(BuildError, Error) /* denotes a permanent build failure */
 
 
 }
-
-
-#endif /* !__STOREAPI_H */
diff --git a/src/libstore/worker-protocol.hh b/src/libstore/worker-protocol.hh
index b08410fa1c42..501c0b3db5b9 100644
--- a/src/libstore/worker-protocol.hh
+++ b/src/libstore/worker-protocol.hh
@@ -1,6 +1,4 @@
-#ifndef __WORKER_PROTOCOL_H
-#define __WORKER_PROTOCOL_H
-
+#pragma once
 
 namespace nix {
 
@@ -64,6 +62,3 @@ template<class T> T readStorePaths(Source & from);
 
     
 }
-
-
-#endif /* !__WORKER_PROTOCOL_H */
diff --git a/src/libutil/archive.hh b/src/libutil/archive.hh
index fff62031397c..ccac92074d54 100644
--- a/src/libutil/archive.hh
+++ b/src/libutil/archive.hh
@@ -1,5 +1,4 @@
-#ifndef __ARCHIVE_H
-#define __ARCHIVE_H
+#pragma once
 
 #include "types.hh"
 #include "serialise.hh"
@@ -74,6 +73,3 @@ void restorePath(const Path & path, Source & source);
 
  
 }
-
-
-#endif /* !__ARCHIVE_H */
diff --git a/src/libutil/hash.hh b/src/libutil/hash.hh
index e0b6478cc418..781f517428d0 100644
--- a/src/libutil/hash.hh
+++ b/src/libutil/hash.hh
@@ -1,5 +1,4 @@
-#ifndef __HASH_H
-#define __HASH_H
+#pragma once
 
 #include "types.hh"
 #include "serialise.hh"
@@ -109,6 +108,3 @@ public:
 
 
 }
-
-
-#endif /* !__HASH_H */
diff --git a/src/libutil/immutable.hh b/src/libutil/immutable.hh
index 5a42a4610736..8af41900490f 100644
--- a/src/libutil/immutable.hh
+++ b/src/libutil/immutable.hh
@@ -1,5 +1,4 @@
-#ifndef __IMMUTABLE_H
-#define __IMMUTABLE_H
+#pragma once
 
 #include <types.hh>
 
@@ -15,5 +14,3 @@ void makeImmutable(const Path & path);
 void makeMutable(const Path & path);
 
 }
-
-#endif /* !__IMMUTABLE_H */
diff --git a/src/libutil/serialise.hh b/src/libutil/serialise.hh
index ded4b12a046e..42dd271176db 100644
--- a/src/libutil/serialise.hh
+++ b/src/libutil/serialise.hh
@@ -1,5 +1,4 @@
-#ifndef __SERIALISE_H
-#define __SERIALISE_H
+#pragma once
 
 #include "types.hh"
 
@@ -130,6 +129,3 @@ MakeError(SerialisationError, Error)
 
 
 }
-
-
-#endif /* !__SERIALISE_H */
diff --git a/src/libutil/types.hh b/src/libutil/types.hh
index 844ad6f76a13..165a46fa28e9 100644
--- a/src/libutil/types.hh
+++ b/src/libutil/types.hh
@@ -1,5 +1,4 @@
-#ifndef __TYPES_H
-#define __TYPES_H
+#pragma once
 
 #include <string>
 #include <list>
@@ -74,6 +73,3 @@ typedef enum {
 
 
 }
-
-
-#endif /* !__TYPES_H */
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index ee0f3862a872..362d0f65e2c2 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -1,5 +1,4 @@
-#ifndef __UTIL_H
-#define __UTIL_H
+#pragma once
 
 #include "types.hh"
 
@@ -333,6 +332,3 @@ void ignoreException();
 
 
 }
-
-
-#endif /* !__UTIL_H */
diff --git a/src/libutil/xml-writer.hh b/src/libutil/xml-writer.hh
index e5cc5f8c5417..fee2eb495eaf 100644
--- a/src/libutil/xml-writer.hh
+++ b/src/libutil/xml-writer.hh
@@ -1,5 +1,4 @@
-#ifndef __XML_WRITER_H
-#define __XML_WRITER_H
+#pragma once
 
 #include <iostream>
 #include <string>
@@ -70,6 +69,3 @@ public:
 
  
 }
-
-
-#endif /* !__XML_WRITER_H */
diff --git a/src/nix-env/profiles.hh b/src/nix-env/profiles.hh
index a64258dae224..30d2376d998c 100644
--- a/src/nix-env/profiles.hh
+++ b/src/nix-env/profiles.hh
@@ -1,5 +1,4 @@
-#ifndef __PROFILES_H
-#define __PROFILES_H
+#pragma once
 
 #include "types.hh"
 #include "pathlocks.hh"
@@ -54,6 +53,3 @@ void lockProfile(PathLocks & lock, const Path & profile);
 string optimisticLockProfile(const Path & profile);
 
 }
-
-
-#endif /* !__PROFILES_H */
diff --git a/src/nix-env/user-env.hh b/src/nix-env/user-env.hh
index 4125d821732f..f188efe9b4a9 100644
--- a/src/nix-env/user-env.hh
+++ b/src/nix-env/user-env.hh
@@ -1,5 +1,4 @@
-#ifndef __USER_ENV_H
-#define __USER_ENV_H
+#pragma once
 
 #include "get-drvs.hh"
 
@@ -12,9 +11,3 @@ bool createUserEnv(EvalState & state, DrvInfos & elems,
     const string & lockToken);
 
 }
-
-#endif /* !__USER_ENV_H */
-
-
-
-
diff --git a/src/nix-store/dotgraph.hh b/src/nix-store/dotgraph.hh
index 2318e2fde48d..68410d84156d 100644
--- a/src/nix-store/dotgraph.hh
+++ b/src/nix-store/dotgraph.hh
@@ -1,5 +1,4 @@
-#ifndef __DOTGRAPH_H
-#define __DOTGRAPH_H
+#pragma once
 
 #include "types.hh"
 
@@ -8,5 +7,3 @@ namespace nix {
 void printDotGraph(const PathSet & roots);
 
 }
-
-#endif /* !__DOTGRAPH_H */
diff --git a/src/nix-store/xmlgraph.hh b/src/nix-store/xmlgraph.hh
index 2f9908c43665..c2216c5a4627 100644
--- a/src/nix-store/xmlgraph.hh
+++ b/src/nix-store/xmlgraph.hh
@@ -1,5 +1,4 @@
-#ifndef __XMLGRAPH_H
-#define __XMLGRAPH_H
+#pragma once
 
 #include "types.hh"
 
@@ -8,5 +7,3 @@ namespace nix {
 void printXmlGraph(const PathSet & roots);
 
 }
-
-#endif /* !__XMLGRAPH_H */