Add options for separate compile and link sysroots

Add `CMAKE_SYSROOT_COMPILE` and `CMAKE_SYSROOT_LINK` variables to as
operation-specific alternatives to `CMAKE_SYSROOT`.  This will be useful
for Android NDKs that compile and link with different sysroot values
(e.g. `r14` with unified headers).

Co-Author: Florent Castelli <florent.castelli@gmail.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/Source/cmFindCommon.cxx b/Source/cmFindCommon.cxx
index 110195c..5d46674 100644
--- a/Source/cmFindCommon.cxx
+++ b/Source/cmFindCommon.cxx
@@ -154,10 +154,16 @@ void cmFindCommon::RerootPaths(std::vector<std::string>& paths)
   }
 
   const char* sysroot = this->Makefile->GetDefinition("CMAKE_SYSROOT");
+  const char* sysrootCompile =
+    this->Makefile->GetDefinition("CMAKE_SYSROOT_COMPILE");
+  const char* sysrootLink =
+    this->Makefile->GetDefinition("CMAKE_SYSROOT_LINK");
   const char* rootPath = this->Makefile->GetDefinition("CMAKE_FIND_ROOT_PATH");
   const bool noSysroot = !sysroot || !*sysroot;
+  const bool noCompileSysroot = !sysrootCompile || !*sysrootCompile;
+  const bool noLinkSysroot = !sysrootLink || !*sysrootLink;
   const bool noRootPath = !rootPath || !*rootPath;
-  if (noSysroot && noRootPath) {
+  if (noSysroot && noCompileSysroot && noLinkSysroot && noRootPath) {
     return;
   }
 
@@ -166,6 +172,12 @@ void cmFindCommon::RerootPaths(std::vector<std::string>& paths)
   if (rootPath) {
     cmSystemTools::ExpandListArgument(rootPath, roots);
   }
+  if (sysrootCompile) {
+    roots.push_back(sysrootCompile);
+  }
+  if (sysrootLink) {
+    roots.push_back(sysrootLink);
+  }
   if (sysroot) {
     roots.push_back(sysroot);
   }