Add CMAKE_SYSROOT variable to set --sysroot when cross compiling.

As CMAKE_ROOT_FIND_PATH can be a list, a new CMAKE_SYSROOT is
introduced, which is never a list.

The contents of this variable is passed to supporting compilers
as --sysroot. It is also accounted for when processing implicit
link directories reported by the compiler, and when generating
RPATH information.

4 files changed, 55 insertions, 7 deletions

diff --git a/Source/cmComputeLinkInformation.cxx b/Source/cmComputeLinkInformation.cxx
index d4644c3..3152c2a 100644
--- a/Source/cmComputeLinkInformation.cxx
+++ b/Source/cmComputeLinkInformation.cxx
@@ -1901,6 +1901,8 @@ void cmComputeLinkInformation::GetRPath(std::vector<std::string>& runtimeDirs,
     }
   if(use_build_rpath || use_link_rpath)
     {
+    std::string rootPath = this->Makefile->GetSafeDefinition("CMAKE_SYSROOT");
+    cmSystemTools::ConvertToUnixSlashes(rootPath);
     std::vector<std::string> const& rdirs = this->GetRuntimeSearchPath();
     for(std::vector<std::string>::const_iterator ri = rdirs.begin();
         ri != rdirs.end(); ++ri)
@@ -1909,9 +1911,14 @@ void cmComputeLinkInformation::GetRPath(std::vector<std::string>& runtimeDirs,
       // support or if using the link path as an rpath.
       if(use_build_rpath)
         {
-        if(emitted.insert(*ri).second)
+        std::string d = *ri;
+        if (!rootPath.empty() && d.find(rootPath) == 0)
           {
-          runtimeDirs.push_back(*ri);
+          d = d.substr(rootPath.size());
+          }
+        if(emitted.insert(d).second)
+          {
+          runtimeDirs.push_back(d);
           }
         }
       else if(use_link_rpath)
@@ -1924,9 +1931,14 @@ void cmComputeLinkInformation::GetRPath(std::vector<std::string>& runtimeDirs,
            !cmSystemTools::IsSubDirectory(ri->c_str(), topSourceDir) &&
            !cmSystemTools::IsSubDirectory(ri->c_str(), topBinaryDir))
           {
-          if(emitted.insert(*ri).second)
+          std::string d = *ri;
+          if (!rootPath.empty() && d.find(rootPath) == 0)
+            {
+            d = d.substr(rootPath.size());
+            }
+          if(emitted.insert(d).second)
             {
-            runtimeDirs.push_back(*ri);
+            runtimeDirs.push_back(d);
             }
           }
         }
diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index 900f09f..bbfc427 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -433,6 +433,13 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
       flag += tcDef;
       cmakeFlags.push_back(flag);
       }
+    if (const char *rootDef
+              = this->Makefile->GetDefinition("CMAKE_SYSROOT"))
+      {
+      std::string flag="-DCMAKE_SYSROOT=";
+      flag += rootDef;
+      cmakeFlags.push_back(flag);
+      }
     if(this->Makefile->GetDefinition("CMAKE_POSITION_INDEPENDENT_CODE")!=0)
       {
       fprintf(fout, "set(CMAKE_POSITION_INDEPENDENT_CODE \"ON\")\n");
diff --git a/Source/cmFindCommon.cxx b/Source/cmFindCommon.cxx
index 7beeda0..8c42811 100644
--- a/Source/cmFindCommon.cxx
+++ b/Source/cmFindCommon.cxx
@@ -138,16 +138,27 @@ void cmFindCommon::RerootPaths(std::vector<std::string>& paths)
     {
     return;
     }
+  const char* sysroot =
+    this->Makefile->GetDefinition("CMAKE_SYSROOT");
   const char* rootPath =
     this->Makefile->GetDefinition("CMAKE_FIND_ROOT_PATH");
-  if((rootPath == 0) || (strlen(rootPath) == 0))
+  const bool noSysroot = !sysroot || !*sysroot;
+  const bool noRootPath = !rootPath || !*rootPath;
+  if(noSysroot && noRootPath)
     {
     return;
     }
 
   // Construct the list of path roots with no trailing slashes.
   std::vector<std::string> roots;
-  cmSystemTools::ExpandListArgument(rootPath, roots);
+  if (rootPath)
+    {
+    cmSystemTools::ExpandListArgument(rootPath, roots);
+    }
+  if (sysroot)
+    {
+    roots.push_back(sysroot);
+    }
   for(std::vector<std::string>::iterator ri = roots.begin();
       ri != roots.end(); ++ri)
     {
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 582ad0e..d2784a9 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -1047,6 +1047,8 @@ cmLocalGenerator::ExpandRuleVariable(std::string const& variable,
       const char* compilerOptionTarget = 0;
       const char* compilerExternalToolchain = 0;
       const char* compilerOptionExternalToolchain = 0;
+      const char* compilerSysroot = 0;
+      const char* compilerOptionSysroot = 0;
       if(actualReplace == "CMAKE_${LANG}_COMPILER")
         {
         std::string arg1 = actualReplace + "_ARG1";
@@ -1067,6 +1069,12 @@ cmLocalGenerator::ExpandRuleVariable(std::string const& variable,
               = this->Makefile->GetDefinition(
                 (std::string("CMAKE_") + lang +
                               "_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN").c_str());
+        compilerSysroot
+              = this->Makefile->GetDefinition("CMAKE_SYSROOT");
+        compilerOptionSysroot
+              = this->Makefile->GetDefinition(
+                (std::string("CMAKE_") + lang +
+                              "_COMPILE_OPTIONS_SYSROOT").c_str());
         }
       if(actualReplace.find("${LANG}") != actualReplace.npos)
         {
@@ -1099,6 +1107,12 @@ cmLocalGenerator::ExpandRuleVariable(std::string const& variable,
             ret += compilerOptionExternalToolchain;
             ret += this->EscapeForShell(compilerExternalToolchain, true);
             }
+          if (compilerSysroot && compilerOptionSysroot)
+            {
+            ret += " ";
+            ret += compilerOptionSysroot;
+            ret += this->EscapeForShell(compilerSysroot, true);
+            }
           return ret;
           }
         return replace;
@@ -1493,6 +1507,8 @@ void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs,
     return;
     }
 
+  std::string rootPath = this->Makefile->GetSafeDefinition("CMAKE_SYSROOT");
+
   std::vector<std::string> implicitDirs;
   // Load implicit include directories for this language.
   std::string impDirVar = "CMAKE_";
@@ -1505,7 +1521,9 @@ void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs,
     for(std::vector<std::string>::const_iterator i = impDirVec.begin();
         i != impDirVec.end(); ++i)
       {
-      emitted.insert(*i);
+      std::string d = rootPath + *i;
+      cmSystemTools::ConvertToUnixSlashes(d);
+      emitted.insert(d);
       if (!stripImplicitInclDirs)
         {
         implicitDirs.push_back(*i);