[libomptarget] Fix 'libomptarget' libraries being installed twice

[jhuber6]

Summary:
We use add_llvm_library as a shorthand for setting up all the
dependencies and libraries we need for the OpenMP offloading runtime as
they depend on a lot of the LLVM utilities. However, we always
explicitly installed these manually. Behind the scenes the function
would then install it again. This was unnoticed because until now the
destinations matched. Now that we want it to optionally go into the
other directory it is duplicating them. Fix this by stating that this is
a build tree only library so we can handle it ourselves.

[llvmbot]

@llvm/pr-subscribers-backend-amdgpu

Author: Joseph Huber (jhuber6)

Changes

Summary:
We use add_llvm_library as a shorthand for setting up all the
dependencies and libraries we need for the OpenMP offloading runtime as
they depend on a lot of the LLVM utilities. However, we always
explicitly installed these manually. Behind the scenes the function
would then install it again. This was unnoticed because until now the
destinations matched. Now that we want it to optionally go into the
other directory it is duplicating them. Fix this by stating that this is
a build tree only library so we can handle it ourselves.

---

Full diff: https://github.com/llvm/llvm-project/pull/83624.diff

4 Files Affected:

• (modified) openmp/libomptarget/plugins-nextgen/CMakeLists.txt (+1)
• (modified) openmp/libomptarget/plugins-nextgen/amdgpu/CMakeLists.txt (+1)
• (modified) openmp/libomptarget/plugins-nextgen/cuda/CMakeLists.txt (+1)
• (modified) openmp/libomptarget/src/CMakeLists.txt (+1)

diff --git a/openmp/libomptarget/plugins-nextgen/CMakeLists.txt b/openmp/libomptarget/plugins-nextgen/CMakeLists.txt
index 3cc2b8512b77f6..3ca02368253ef8 100644
--- a/openmp/libomptarget/plugins-nextgen/CMakeLists.txt
+++ b/openmp/libomptarget/plugins-nextgen/CMakeLists.txt
@@ -46,6 +46,7 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "${tmachine}$")
       ${OPENMP_PTHREAD_LIB}
 
     NO_INSTALL_RPATH
+    BUILDTREE_ONLY
   )
 
   if(LIBOMPTARGET_DEP_LIBFFI_FOUND)
diff --git a/openmp/libomptarget/plugins-nextgen/amdgpu/CMakeLists.txt b/openmp/libomptarget/plugins-nextgen/amdgpu/CMakeLists.txt
index 68ce63467a6c81..9e0ea08d8375fd 100644
--- a/openmp/libomptarget/plugins-nextgen/amdgpu/CMakeLists.txt
+++ b/openmp/libomptarget/plugins-nextgen/amdgpu/CMakeLists.txt
@@ -78,6 +78,7 @@ add_llvm_library(omptarget.rtl.amdgpu SHARED
   ${LDFLAGS_UNDEFINED}
 
   NO_INSTALL_RPATH
+  BUILDTREE_ONLY
 )
 
 if ((OMPT_TARGET_DEFAULT) AND (LIBOMPTARGET_OMPT_SUPPORT))
diff --git a/openmp/libomptarget/plugins-nextgen/cuda/CMakeLists.txt b/openmp/libomptarget/plugins-nextgen/cuda/CMakeLists.txt
index 95b288cab31149..2bfb47168a7f3b 100644
--- a/openmp/libomptarget/plugins-nextgen/cuda/CMakeLists.txt
+++ b/openmp/libomptarget/plugins-nextgen/cuda/CMakeLists.txt
@@ -38,6 +38,7 @@ add_llvm_library(omptarget.rtl.cuda SHARED
   ${OPENMP_PTHREAD_LIB}
 
   NO_INSTALL_RPATH
+  BUILDTREE_ONLY
 )
 
 if ((OMPT_TARGET_DEFAULT) AND (LIBOMPTARGET_OMPT_SUPPORT))
diff --git a/openmp/libomptarget/src/CMakeLists.txt b/openmp/libomptarget/src/CMakeLists.txt
index 1a0e26f104be63..9bc3f3339583d9 100644
--- a/openmp/libomptarget/src/CMakeLists.txt
+++ b/openmp/libomptarget/src/CMakeLists.txt
@@ -41,6 +41,7 @@ add_llvm_library(omptarget
   omp
 
   NO_INSTALL_RPATH
+  BUILDTREE_ONLY
 )
 target_include_directories(omptarget PRIVATE ${LIBOMPTARGET_INCLUDE_DIR})