Add options to specify linker tool

Offer the capability, through variable `CMAKE_LINKER_TYPE`, as well as
the target property `LINKER_TYPE` to specify which linker must be used.

The implementation of this capability is specified by variables specific
to the language and linker type: `CMAKE_<LANG>_USING_LINKER_<TYPE>`.
Some definitions are provided as part of `CMake`.

For example, to select the `LLVM` linker rather than the standard one,
the type `LLD` should be specified through the variable `CMAKE_LINKER_TYPE`.
And, on `Apple`, `Linux` and some environments on `Windows`, the variable
`CMAKE_<LANG>_USING_LINKER_LLD` has value `-fuse-ld=lld`. And for `Windows`
environments  based on `MSVC`, where the linker is used directly, the tool
`lld-link.exe` will be used rather than `link.exe`.

Fixes: #19174, #24254, #24990

1 files changed, 3 insertions, 0 deletions

diff --git a/Source/cmMakefileExecutableTargetGenerator.cxx b/Source/cmMakefileExecutableTargetGenerator.cxx
index 4a2b9e8..96a0d5c 100644
--- a/Source/cmMakefileExecutableTargetGenerator.cxx
+++ b/Source/cmMakefileExecutableTargetGenerator.cxx
@@ -344,6 +344,8 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
     return;
   }
 
+  auto linker = this->GeneratorTarget->GetLinkerTool(this->GetConfigName());
+
   // Build list of dependencies.
   std::vector<std::string> depends;
   this->AppendLinkDepends(depends, linkLanguage);
@@ -533,6 +535,7 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
     vars.CMTargetType =
       cmState::GetTargetTypeName(this->GeneratorTarget->GetType()).c_str();
     vars.Language = linkLanguage.c_str();
+    vars.Linker = linker.c_str();
     vars.AIXExports = aixExports.c_str();
     vars.Objects = buildObjs.c_str();
     std::string objectDir = this->GeneratorTarget->GetSupportDirectory();