Merge topic 'FixImplicitDepends2'

05f162c AddCustomCommand: Handle multiple IMPLICIT_DEPENDS files (#10048)
c66f03a cmDepends: No dependency-vector erasure in CheckDependencies
e74ff7c cmDepends: allow multiple dependees per depender
ecc77d0 cmDependsC: fix indentation
3e7d97d cmDependsC: remove code duplication
b4e8f49 cmDependsC: remove unused member variable

13 files changed, 195 insertions, 166 deletions

diff --git a/Source/cmAddCustomCommandCommand.h b/Source/cmAddCustomCommandCommand.h
index c5252b7..1cc1e3a 100644
--- a/Source/cmAddCustomCommandCommand.h
+++ b/Source/cmAddCustomCommandCommand.h
@@ -68,7 +68,8 @@ public:
       "                     [COMMAND command2 [ARGS] [args2...] ...]\n"
       "                     [MAIN_DEPENDENCY depend]\n"
       "                     [DEPENDS [depends...]]\n"
-      "                     [IMPLICIT_DEPENDS <lang1> depend1 ...]\n"
+      "                     [IMPLICIT_DEPENDS <lang1> depend1\n"
+      "                                      [<lang2> depend2] ...]\n"
       "                     [WORKING_DIRECTORY dir]\n"
       "                     [COMMENT comment] [VERBATIM] [APPEND])\n"
       "This defines a command to generate specified OUTPUT file(s).  "
@@ -142,6 +143,8 @@ public:
       "dependencies of an input file.  The language given specifies the "
       "programming language whose corresponding dependency scanner should "
       "be used.  Currently only C and CXX language scanners are supported. "
+      "The language has to be specified for every file in the "
+      "IMPLICIT_DEPENDS list. "
       "Dependencies discovered from the scanning are added to those of "
       "the custom command at build time.  Note that the IMPLICIT_DEPENDS "
       "option is currently supported only for Makefile generators and "
diff --git a/Source/cmDepends.cxx b/Source/cmDepends.cxx
index 166a584..74a0ccb 100644
--- a/Source/cmDepends.cxx
+++ b/Source/cmDepends.cxx
@@ -50,6 +50,7 @@ bool cmDepends::Write(std::ostream &makeDepends,
   std::vector<std::string> pairs;
   cmSystemTools::ExpandListArgument(srcStr, pairs);
 
+  std::map<std::string, std::set<std::string> > dependencies;
   for(std::vector<std::string>::iterator si = pairs.begin();
       si != pairs.end();)
     {
@@ -62,9 +63,14 @@ bool cmDepends::Write(std::ostream &makeDepends,
     obj = this->LocalGenerator->Convert(obj.c_str(),
                                         cmLocalGenerator::HOME_OUTPUT,
                                         cmLocalGenerator::MAKEFILE);
+    dependencies[obj].insert(src);
+    }
+  for(std::map<std::string, std::set<std::string> >::const_iterator
+      it = dependencies.begin(); it != dependencies.end(); ++it)
+    {
 
     // Write the dependencies for this pair.
-    if(!this->WriteDependencies(src.c_str(), obj.c_str(),
+    if(!this->WriteDependencies(it->second, it->first,
                                 makeDepends, internalDepends))
       {
       return false;
@@ -134,8 +140,9 @@ void cmDepends::Clear(const char *file)
 }
 
 //----------------------------------------------------------------------------
-bool cmDepends::WriteDependencies(const char*, const char*,
-                                  std::ostream&, std::ostream&)
+bool cmDepends::WriteDependencies(
+    const std::set<std::string>&, const std::string&,
+    std::ostream&, std::ostream&)
 {
   // This should be implemented by the subclass.
   return false;
@@ -174,8 +181,10 @@ bool cmDepends::CheckDependencies(std::istream& internalDepends,
       // kdelibs/khtml this reduces the number of calls from 184k down to 92k,
       // or the time for cmake -E cmake_depends from 0.3 s down to 0.21 s.
       dependerExists = cmSystemTools::FileExists(this->Depender);
-      DependencyVector tmp;
-      validDeps[this->Depender] = tmp;
+      // If we erase validDeps[this->Depender] by overwriting it with an empty
+      // vector, we lose dependencies for dependers that have multiple
+      // entries. No need to initialize the entry, std::map will do so on first
+      // access.
       currentDependencies = &validDeps[this->Depender];
       continue;
       }
diff --git a/Source/cmDepends.h b/Source/cmDepends.h
index f7dc881..d787edd 100644
--- a/Source/cmDepends.h
+++ b/Source/cmDepends.h
@@ -76,8 +76,10 @@ protected:
 
   // Write dependencies for the target file to the given stream.
   // Return true for success and false for failure.
-  virtual bool WriteDependencies(const char *src, const char* obj,
-    std::ostream& makeDepends, std::ostream& internalDepends);
+  virtual bool WriteDependencies(const std::set<std::string>& sources,
+                                 const std::string& obj,
+                                 std::ostream& makeDepends,
+                                 std::ostream& internalDepends);
 
   // Check dependencies for the target file in the given stream.
   // Return false if dependencies must be regenerated and true
diff --git a/Source/cmDependsC.cxx b/Source/cmDependsC.cxx
index 44841a9..43b7b8a 100644
--- a/Source/cmDependsC.cxx
+++ b/Source/cmDependsC.cxx
@@ -98,176 +98,179 @@ cmDependsC::~cmDependsC()
 }
 
 //----------------------------------------------------------------------------
-bool cmDependsC::WriteDependencies(const char *src, const char *obj,
-  std::ostream& makeDepends, std::ostream& internalDepends)
+bool cmDependsC::WriteDependencies(const std::set<std::string>& sources,
+                                   const std::string& obj,
+                                   std::ostream& makeDepends,
+                                   std::ostream& internalDepends)
 {
   // Make sure this is a scanning instance.
-  if(!src || src[0] == '\0')
+  if(sources.empty() || sources.begin()->empty())
     {
     cmSystemTools::Error("Cannot scan dependencies without a source file.");
     return false;
     }
-  if(!obj || obj[0] == '\0')
+  if(obj.empty())
     {
     cmSystemTools::Error("Cannot scan dependencies without an object file.");
     return false;
     }
 
+  std::set<cmStdString> dependencies;
+  bool haveDeps = false;
+
   if (this->ValidDeps != 0)
     {
     std::map<std::string, DependencyVector>::const_iterator tmpIt =
                                                     this->ValidDeps->find(obj);
     if (tmpIt!= this->ValidDeps->end())
       {
-      // Write the dependencies to the output stream.  Makefile rules
-      // written by the original local generator for this directory
-      // convert the dependencies to paths relative to the home output
-      // directory.  We must do the same here.
-      internalDepends << obj << std::endl;
       for(DependencyVector::const_iterator i=tmpIt->second.begin();
          i != tmpIt->second.end(); ++i)
         {
-        makeDepends << obj << ": " <<
-           this->LocalGenerator->Convert(i->c_str(),
-                                         cmLocalGenerator::HOME_OUTPUT,
-                                         cmLocalGenerator::MAKEFILE)
-           << std::endl;
-        internalDepends << " " << i->c_str() << std::endl;
+        dependencies.insert(*i);
         }
-      makeDepends << std::endl;
-      return true;
+      haveDeps = true;
       }
     }
 
-  // Walk the dependency graph starting with the source file.
-  bool first = true;
-  UnscannedEntry root;
-  root.FileName = src;
-  this->Unscanned.push(root);
-  this->Encountered.clear();
-  this->Encountered.insert(src);
-  std::set<cmStdString> dependencies;
-  std::set<cmStdString> scanned;
+  if (!haveDeps)
+    {
+    // Walk the dependency graph starting with the source file.
+    int srcFiles = (int)sources.size();
+    this->Encountered.clear();
+
+    for(std::set<std::string>::const_iterator srcIt = sources.begin();
+        srcIt != sources.end(); ++srcIt)
+      {
+      UnscannedEntry root;
+      root.FileName = *srcIt;
+      this->Unscanned.push(root);
+      this->Encountered.insert(*srcIt);
+      }
 
-  // Use reserve to allocate enough memory for tempPathStr
-  // so that during the loops no memory is allocated or freed
-  std::string tempPathStr;
-  tempPathStr.reserve(4*1024);
+    std::set<cmStdString> scanned;
 
-  while(!this->Unscanned.empty())
-    {
-    // Get the next file to scan.
-    UnscannedEntry current = this->Unscanned.front();
-    this->Unscanned.pop();
+    // Use reserve to allocate enough memory for tempPathStr
+    // so that during the loops no memory is allocated or freed
+    std::string tempPathStr;
+    tempPathStr.reserve(4*1024);
 
-    // If not a full path, find the file in the include path.
-    std::string fullName;
-    if(first || cmSystemTools::FileIsFullPath(current.FileName.c_str()))
+    while(!this->Unscanned.empty())
       {
-      if(cmSystemTools::FileExists(current.FileName.c_str(), true))
+      // Get the next file to scan.
+      UnscannedEntry current = this->Unscanned.front();
+      this->Unscanned.pop();
+
+      // If not a full path, find the file in the include path.
+      std::string fullName;
+      if((srcFiles>0)
+         || cmSystemTools::FileIsFullPath(current.FileName.c_str()))
         {
-        fullName = current.FileName;
+        if(cmSystemTools::FileExists(current.FileName.c_str(), true))
+          {
+          fullName = current.FileName;
+          }
         }
-      }
-    else if(!current.QuotedLocation.empty() &&
-            cmSystemTools::FileExists(current.QuotedLocation.c_str(), true))
-      {
-      // The include statement producing this entry was a double-quote
-      // include and the included file is present in the directory of
-      // the source containing the include statement.
-      fullName = current.QuotedLocation;
-      }
-    else
-      {
-      std::map<cmStdString, cmStdString>::iterator
-        headerLocationIt=this->HeaderLocationCache.find(current.FileName);
-      if (headerLocationIt!=this->HeaderLocationCache.end())
+      else if(!current.QuotedLocation.empty() &&
+              cmSystemTools::FileExists(current.QuotedLocation.c_str(), true))
         {
-        fullName=headerLocationIt->second;
+        // The include statement producing this entry was a double-quote
+        // include and the included file is present in the directory of
+        // the source containing the include statement.
+        fullName = current.QuotedLocation;
         }
-      else for(std::vector<std::string>::const_iterator i =
-            this->IncludePath.begin(); i != this->IncludePath.end(); ++i)
+      else
         {
-        // Construct the name of the file as if it were in the current
-        // include directory.  Avoid using a leading "./".
-
-        tempPathStr = "";
-        if((*i) == ".")
+        std::map<cmStdString, cmStdString>::iterator
+          headerLocationIt=this->HeaderLocationCache.find(current.FileName);
+        if (headerLocationIt!=this->HeaderLocationCache.end())
           {
-          tempPathStr += current.FileName;
+          fullName=headerLocationIt->second;
           }
-        else
+        else for(std::vector<std::string>::const_iterator i =
+              this->IncludePath.begin(); i != this->IncludePath.end(); ++i)
           {
-          tempPathStr += *i;
-          tempPathStr+="/";
-          tempPathStr+=current.FileName;
-          }
+          // Construct the name of the file as if it were in the current
+          // include directory.  Avoid using a leading "./".
 
-        // Look for the file in this location.
-        if(cmSystemTools::FileExists(tempPathStr.c_str(), true))
-          {
-          fullName = tempPathStr;
-          HeaderLocationCache[current.FileName]=fullName;
-          break;
+          tempPathStr = "";
+          if((*i) == ".")
+            {
+            tempPathStr += current.FileName;
+            }
+          else
+            {
+            tempPathStr += *i;
+            tempPathStr+="/";
+            tempPathStr+=current.FileName;
+            }
+
+          // Look for the file in this location.
+          if(cmSystemTools::FileExists(tempPathStr.c_str(), true))
+            {
+            fullName = tempPathStr;
+            HeaderLocationCache[current.FileName]=fullName;
+            break;
+            }
           }
         }
-      }
-
-    // Complain if the file cannot be found and matches the complain
-    // regex.
-    if(fullName.empty() &&
-       this->IncludeRegexComplain.find(current.FileName.c_str()))
-      {
-      cmSystemTools::Error("Cannot find file \"",
-                           current.FileName.c_str(), "\".");
-      return false;
-      }
 
-    // Scan the file if it was found and has not been scanned already.
-    if(!fullName.empty() && (scanned.find(fullName) == scanned.end()))
-      {
-      // Record scanned files.
-      scanned.insert(fullName);
+      // Complain if the file cannot be found and matches the complain
+      // regex.
+      if(fullName.empty() &&
+        this->IncludeRegexComplain.find(current.FileName.c_str()))
+        {
+        cmSystemTools::Error("Cannot find file \"",
+                            current.FileName.c_str(), "\".");
+        return false;
+        }
 
-      // Check whether this file is already in the cache
-      std::map<cmStdString, cmIncludeLines*>::iterator fileIt=
-        this->FileCache.find(fullName);
-      if (fileIt!=this->FileCache.end())
+      // Scan the file if it was found and has not been scanned already.
+      if(!fullName.empty() && (scanned.find(fullName) == scanned.end()))
         {
-        fileIt->second->Used=true;
-        dependencies.insert(fullName);
-        for (std::vector<UnscannedEntry>::const_iterator incIt=
-               fileIt->second->UnscannedEntries.begin();
-             incIt!=fileIt->second->UnscannedEntries.end(); ++incIt)
+        // Record scanned files.
+        scanned.insert(fullName);
+
+        // Check whether this file is already in the cache
+        std::map<cmStdString, cmIncludeLines*>::iterator fileIt=
+          this->FileCache.find(fullName);
+        if (fileIt!=this->FileCache.end())
           {
-          if (this->Encountered.find(incIt->FileName) ==
-              this->Encountered.end())
+          fileIt->second->Used=true;
+          dependencies.insert(fullName);
+          for (std::vector<UnscannedEntry>::const_iterator incIt=
+                fileIt->second->UnscannedEntries.begin();
+              incIt!=fileIt->second->UnscannedEntries.end(); ++incIt)
             {
-            this->Encountered.insert(incIt->FileName);
-            this->Unscanned.push(*incIt);
+            if (this->Encountered.find(incIt->FileName) ==
+                this->Encountered.end())
+              {
+              this->Encountered.insert(incIt->FileName);
+              this->Unscanned.push(*incIt);
+              }
             }
           }
-        }
-      else
-        {
-
-        // Try to scan the file.  Just leave it out if we cannot find
-        // it.
-        std::ifstream fin(fullName.c_str());
-        if(fin)
+        else
           {
-          // Add this file as a dependency.
-          dependencies.insert(fullName);
 
-          // Scan this file for new dependencies.  Pass the directory
-          // containing the file to handle double-quote includes.
-          std::string dir = cmSystemTools::GetFilenamePath(fullName);
-          this->Scan(fin, dir.c_str(), fullName);
+          // Try to scan the file.  Just leave it out if we cannot find
+          // it.
+          std::ifstream fin(fullName.c_str());
+          if(fin)
+            {
+            // Add this file as a dependency.
+            dependencies.insert(fullName);
+
+            // Scan this file for new dependencies.  Pass the directory
+            // containing the file to handle double-quote includes.
+            std::string dir = cmSystemTools::GetFilenamePath(fullName);
+            this->Scan(fin, dir.c_str(), fullName);
+            }
           }
         }
-      }
 
-    first = false;
+      srcFiles--;
+      }
     }
 
   // Write the dependencies to the output stream.  Makefile rules
@@ -275,7 +278,7 @@ bool cmDependsC::WriteDependencies(const char *src, const char *obj,
   // convert the dependencies to paths relative to the home output
   // directory.  We must do the same here.
   internalDepends << obj << std::endl;
-  for(std::set<cmStdString>::iterator i=dependencies.begin();
+  for(std::set<cmStdString>::const_iterator i=dependencies.begin();
       i != dependencies.end(); ++i)
     {
     makeDepends << obj << ": " <<
diff --git a/Source/cmDependsC.h b/Source/cmDependsC.h
index bd9a4b7..16dfad7 100644
--- a/Source/cmDependsC.h
+++ b/Source/cmDependsC.h
@@ -32,11 +32,9 @@ public:
   virtual ~cmDependsC();
 
 protected:
-  typedef std::vector<char> t_CharBuffer;
-
   // Implement writing/checking methods required by superclass.
-  virtual bool WriteDependencies(const char *src,
-                                 const char *file,
+  virtual bool WriteDependencies(const std::set<std::string>& sources,
+                                 const std::string&           obj,
                                  std::ostream& makeDepends,
                                  std::ostream& internalDepends);
 
@@ -82,7 +80,6 @@ protected:
   const std::map<std::string, DependencyVector>* ValidDeps;
   std::set<cmStdString> Encountered;
   std::queue<UnscannedEntry> Unscanned;
-  t_CharBuffer Buffer;
 
   std::map<cmStdString, cmIncludeLines *> FileCache;
   std::map<cmStdString, cmStdString> HeaderLocationCache;
diff --git a/Source/cmDependsFortran.cxx b/Source/cmDependsFortran.cxx
index 3e66058..e41e5ea 100644
--- a/Source/cmDependsFortran.cxx
+++ b/Source/cmDependsFortran.cxx
@@ -170,44 +170,50 @@ cmDependsFortran::~cmDependsFortran()
 }
 
 //----------------------------------------------------------------------------
-bool cmDependsFortran::WriteDependencies(const char *src, const char *obj,
-                                         std::ostream&, std::ostream&)
+bool cmDependsFortran::WriteDependencies(
+    const std::set<std::string>& sources, const std::string& obj,
+    std::ostream&, std::ostream&)
 {
   // Make sure this is a scanning instance.
-  if(!src || src[0] == '\0')
+  if(sources.empty() || sources.begin()->empty())
     {
-    cmSystemTools::Error("Cannot scan dependencies without an source file.");
+    cmSystemTools::Error("Cannot scan dependencies without a source file.");
     return false;
     }
-  if(!obj || obj[0] == '\0')
+  if(obj.empty())
     {
     cmSystemTools::Error("Cannot scan dependencies without an object file.");
     return false;
     }
 
-  // Get the information object for this source.
-  cmDependsFortranSourceInfo& info =
-    this->Internal->CreateObjectInfo(obj, src);
+  bool okay = true;
+  for(std::set<std::string>::const_iterator it = sources.begin();
+      it != sources.end(); ++it)
+    {
+    const std::string& src = *it;
+    // Get the information object for this source.
+    cmDependsFortranSourceInfo& info =
+      this->Internal->CreateObjectInfo(obj.c_str(), src.c_str());
 
-  // Make a copy of the macros defined via ADD_DEFINITIONS
-  std::set<std::string> ppDefines(this->PPDefinitions.begin(),
-                                  this->PPDefinitions.end());
+    // Make a copy of the macros defined via ADD_DEFINITIONS
+    std::set<std::string> ppDefines(this->PPDefinitions.begin(),
+                                    this->PPDefinitions.end());
 
-  // Create the parser object. The constructor takes ppMacro and info per
-  // reference, so we may look into the resulting objects later.
-  cmDependsFortranParser parser(this, ppDefines, info);
+    // Create the parser object. The constructor takes ppMacro and info per
+    // reference, so we may look into the resulting objects later.
+    cmDependsFortranParser parser(this, ppDefines, info);
 
-  // Push on the starting file.
-  cmDependsFortranParser_FilePush(&parser, src);
+    // Push on the starting file.
+    cmDependsFortranParser_FilePush(&parser, src.c_str());
 
-  // Parse the translation unit.
-  if(cmDependsFortran_yyparse(parser.Scanner) != 0)
-    {
-    // Failed to parse the file.  Report failure to write dependencies.
-    return false;
+    // Parse the translation unit.
+    if(cmDependsFortran_yyparse(parser.Scanner) != 0)
+      {
+      // Failed to parse the file.  Report failure to write dependencies.
+      okay = false;
+      }
     }
-
-  return true;
+  return okay;
 }
 
 //----------------------------------------------------------------------------
diff --git a/Source/cmDependsFortran.h b/Source/cmDependsFortran.h
index cdfde6e..cb40796 100644
--- a/Source/cmDependsFortran.h
+++ b/Source/cmDependsFortran.h
@@ -66,7 +66,7 @@ protected:
 
   // Implement writing/checking methods required by superclass.
   virtual bool WriteDependencies(
-    const char *src, const char *file,
+    const std::set<std::string>& sources, const std::string& file,
     std::ostream& makeDepends, std::ostream& internalDepends);
 
   // Actually write the depenencies to the streams.
diff --git a/Source/cmDependsJava.cxx b/Source/cmDependsJava.cxx
index ba0e8fb..949d465 100644
--- a/Source/cmDependsJava.cxx
+++ b/Source/cmDependsJava.cxx
@@ -25,11 +25,11 @@ cmDependsJava::~cmDependsJava()
 }
 
 //----------------------------------------------------------------------------
-bool cmDependsJava::WriteDependencies(const char *src, const char *,
-  std::ostream&, std::ostream&)
+bool cmDependsJava::WriteDependencies(const std::set<std::string>& sources,
+    const std::string&, std::ostream&, std::ostream&)
 {
   // Make sure this is a scanning instance.
-  if(!src || src[0] == '\0')
+  if(sources.empty() || sources.begin()->empty())
     {
     cmSystemTools::Error("Cannot scan dependencies without an source file.");
     return false;
diff --git a/Source/cmDependsJava.h b/Source/cmDependsJava.h
index bf7e234..22af53f 100644
--- a/Source/cmDependsJava.h
+++ b/Source/cmDependsJava.h
@@ -29,7 +29,8 @@ public:
 
 protected:
   // Implement writing/checking methods required by superclass.
-  virtual bool WriteDependencies(const char *src, const char *file,
+  virtual bool WriteDependencies(
+    const std::set<std::string>& sources, const std::string& file,
     std::ostream& makeDepends, std::ostream& internalDepends);
   virtual bool CheckDependencies(std::istream& internalDepends,
                                  const char* internalDependsFileName,
diff --git a/Source/cmLocalUnixMakefileGenerator3.cxx b/Source/cmLocalUnixMakefileGenerator3.cxx
index db93529..820d25a 100644
--- a/Source/cmLocalUnixMakefileGenerator3.cxx
+++ b/Source/cmLocalUnixMakefileGenerator3.cxx
@@ -1939,8 +1939,12 @@ void cmLocalUnixMakefileGenerator3
     for(ImplicitDependFileMap::const_iterator pi = implicitPairs.begin();
         pi != implicitPairs.end(); ++pi)
       {
-      cmakefileStream << "  \"" << pi->second << "\" ";
-      cmakefileStream << "\"" << pi->first << "\"\n";
+      for(cmDepends::DependencyVector::const_iterator di = pi->second.begin();
+          di != pi->second.end(); ++ di)
+        {
+        cmakefileStream << "  \"" << *di << "\" ";
+        cmakefileStream << "\"" << pi->first << "\"\n";
+        }
       }
     cmakefileStream << "  )\n";
 
@@ -2204,7 +2208,7 @@ cmLocalUnixMakefileGenerator3::AddImplicitDepends(cmTarget const& tgt,
                                                   const char* obj,
                                                   const char* src)
 {
-  this->ImplicitDepends[tgt.GetName()][lang][obj] = src;
+  this->ImplicitDepends[tgt.GetName()][lang][obj].push_back(src);
 }
 
 //----------------------------------------------------------------------------
diff --git a/Source/cmLocalUnixMakefileGenerator3.h b/Source/cmLocalUnixMakefileGenerator3.h
index e374959..703369e 100644
--- a/Source/cmLocalUnixMakefileGenerator3.h
+++ b/Source/cmLocalUnixMakefileGenerator3.h
@@ -209,7 +209,8 @@ public:
 
   // File pairs for implicit dependency scanning.  The key of the map
   // is the depender and the value is the explicit dependee.
-  struct ImplicitDependFileMap: public std::map<cmStdString, cmStdString> {};
+  struct ImplicitDependFileMap:
+    public std::map<cmStdString, cmDepends::DependencyVector> {};
   struct ImplicitDependLanguageMap:
     public std::map<cmStdString, ImplicitDependFileMap> {};
   struct ImplicitDependTargetMap:
diff --git a/Tests/BuildDepends/Project/CMakeLists.txt b/Tests/BuildDepends/Project/CMakeLists.txt
index 01f5f62..542c716 100644
--- a/Tests/BuildDepends/Project/CMakeLists.txt
+++ b/Tests/BuildDepends/Project/CMakeLists.txt
@@ -64,7 +64,8 @@ if("${CMAKE_GENERATOR}" MATCHES "Make")
   # Test the IMPLICIT_DEPENDS feature.
   set(ZOT_DEPENDS IMPLICIT_DEPENDS CXX ${CMAKE_CURRENT_SOURCE_DIR}/dep.cxx)
   set(ZOT_CUSTOM_DEP
-    IMPLICIT_DEPENDS CXX ${CMAKE_CURRENT_SOURCE_DIR}/dep_custom.cxx)
+    IMPLICIT_DEPENDS CXX ${CMAKE_CURRENT_SOURCE_DIR}/dep_custom.cxx
+                     CXX ${CMAKE_CURRENT_SOURCE_DIR}/dep_custom2.cxx )
 else()
   # No IMPLICIT_DEPENDS...just depend directly.
   set(ZOT_DEPENDS DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/zot.hxx.in)
diff --git a/Tests/BuildDepends/Project/dep_custom2.cxx b/Tests/BuildDepends/Project/dep_custom2.cxx
new file mode 100644
index 0000000..ac9dee1
--- /dev/null
+++ b/Tests/BuildDepends/Project/dep_custom2.cxx
@@ -0,0 +1,2 @@
+#include <zot_custom.hxx.in>
+// some comment