Add support for x32-abi

Detect x32-abi through CMakeCompilerABI infrastruture and use this
information at runtime to determine the correct library paths with
`FIND_LIBRARY_USE_LIBX32_PATHS`.

Fixes: #15994

1 files changed, 11 insertions, 0 deletions

diff --git a/Source/cmFindPackageCommand.cxx b/Source/cmFindPackageCommand.cxx
index 60de74f..4b29837 100644
--- a/Source/cmFindPackageCommand.cxx
+++ b/Source/cmFindPackageCommand.cxx
@@ -92,6 +92,7 @@ cmFindPackageCommand::cmFindPackageCommand()
   this->DebugMode = false;
   this->UseLib32Paths = false;
   this->UseLib64Paths = false;
+  this->UseLibx32Paths = false;
   this->PolicyScope = true;
   this->VersionMajor = 0;
   this->VersionMinor = 0;
@@ -173,6 +174,13 @@ bool cmFindPackageCommand::InitialPass(std::vector<std::string> const& args,
     this->UseLib64Paths = true;
   }
 
+  // Lookup whether libx32 paths should be used.
+  if (this->Makefile->PlatformIsx32() &&
+      this->Makefile->GetState()->GetGlobalPropertyAsBool(
+        "FIND_LIBRARY_USE_LIBX32_PATHS")) {
+    this->UseLibx32Paths = true;
+  }
+
   // Check if User Package Registry should be disabled
   if (this->Makefile->IsOn("CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY")) {
     this->NoUserRegistry = true;
@@ -2002,6 +2010,9 @@ bool cmFindPackageCommand::SearchPrefix(std::string const& prefix_in)
   if (this->UseLib64Paths) {
     common.push_back("lib64");
   }
+  if (this->UseLibx32Paths) {
+    common.push_back("libx32");
+  }
   common.push_back("lib");
   common.push_back("share");