[flang][runtime] Fixed include directories for Float128Math files.

[vzakhari]

When building FortranRuntime out of tree on aarch64, the list of include
directories for the files comming from FortranFloat128MathILib
has to contain flang/runtime. I did this via INTERFACE_INCLUDE_DIRECTORIES
property.

[llvmbot]

@llvm/pr-subscribers-flang-runtime

Author: Slava Zakharin (vzakhari)

Changes

When building FortranRuntime out of tree on aarch64, the list of include
directories for the files comming from FortranFloat128MathILib
has to contain flang/runtime. I did this via INTERFACE_INCLUDE_DIRECTORIES
property.

---

Full diff: https://github.com/llvm/llvm-project/pull/108466.diff

2 Files Affected:

• (modified) flang/runtime/CMakeLists.txt (+7)
• (modified) flang/runtime/Float128Math/CMakeLists.txt (+3)

diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
index 4537b2d059d65b..0ad1b718d5875b 100644
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -251,6 +251,13 @@ if (NOT TARGET FortranFloat128Math)
       APPEND PROPERTY COMPILE_DEFINITIONS
       ${f128_defs}
       )
+    get_target_property(f128_include_dirs
+      FortranFloat128MathILib INTERFACE_INCLUDE_DIRECTORIES
+      )
+    set_property(SOURCE ${f128_sources}
+      APPEND PROPERTY INCLUDE_DIRECTORIES
+      ${f128_include_dirs}
+      )
     list(APPEND sources ${f128_sources})
   endif()
 endif()
diff --git a/flang/runtime/Float128Math/CMakeLists.txt b/flang/runtime/Float128Math/CMakeLists.txt
index a5f5bec1e7e4b8..87f791f225d0d3 100644
--- a/flang/runtime/Float128Math/CMakeLists.txt
+++ b/flang/runtime/Float128Math/CMakeLists.txt
@@ -69,6 +69,9 @@ set(sources
 
 include_directories(AFTER "${CMAKE_CURRENT_SOURCE_DIR}/..")
 add_library(FortranFloat128MathILib INTERFACE)
+target_include_directories(FortranFloat128MathILib INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/..>
+  )
 
 if (FLANG_RUNTIME_F128_MATH_LIB)
   if (${FLANG_RUNTIME_F128_MATH_LIB} STREQUAL "libquadmath")