[flang-commits] [flang] [flang] Added lowering and runtime for COMPLEX(16) intrinsics. (PR #83874)

[via flang-commits]

================
@@ -94,18 +66,62 @@ set(sources
   )
 
 include_directories(AFTER "${CMAKE_CURRENT_SOURCE_DIR}/..")
-add_flang_library(FortranFloat128Math STATIC INSTALL_WITH_TOOLCHAIN ${sources})
+add_library(FortranFloat128MathILib INTERFACE)
 
-if (DEFINED MSVC)
-  set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)
-  add_flang_library(FortranFloat128Math.static STATIC INSTALL_WITH_TOOLCHAIN
-    ${sources}
-    )
-  set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreadedDebug)
-  add_flang_library(FortranFloat128Math.static_dbg STATIC INSTALL_WITH_TOOLCHAIN
-    ${sources}
-    )
-  add_dependencies(FortranFloat128Math FortranFloat128Math.static
-    FortranFloat128Math.static_dbg
-    )
+if (FLANG_RUNTIME_F128_MATH_LIB)
+  if (${FLANG_RUNTIME_F128_MATH_LIB} STREQUAL "libquadmath")
+    check_include_file(quadmath.h FOUND_QUADMATH_HEADER)
+    if(FOUND_QUADMATH_HEADER)
+      add_compile_definitions(HAS_QUADMATHLIB)
+    else()
+      message(FATAL_ERROR
+        "FLANG_RUNTIME_F128_MATH_LIB setting requires quadmath.h "
+        "to be available: ${FLANG_RUNTIME_F128_MATH_LIB}"
+        )
+    endif()
+  else()
+    message(FATAL_ERROR
+      "Unsupported third-party library for Fortran F128 math runtime: "
+      "${FLANG_RUNTIME_F128_MATH_LIB}"
+      )
+  endif()
+
+  add_flang_library(FortranFloat128Math STATIC INSTALL_WITH_TOOLCHAIN
+    ${sources})
+
+  if (DEFINED MSVC)
+    set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)
+    add_flang_library(FortranFloat128Math.static STATIC INSTALL_WITH_TOOLCHAIN
+      ${sources}
+      )
+    set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreadedDebug)
+    add_flang_library(FortranFloat128Math.static_dbg STATIC INSTALL_WITH_TOOLCHAIN
+      ${sources}
+      )
+    add_dependencies(FortranFloat128Math FortranFloat128Math.static
+      FortranFloat128Math.static_dbg
+      )
+  endif()
+elseif (HAVE_LDBL_MANT_DIG_113)
+  # We can use 'long double' versions from libc.
+  check_library_exists(m sinl "" FOUND_LIBM)
+  if (NOT FOUND_LIBM)
+    message(FATAL_ERROR "FortranRuntime cannot build without libm")
+  endif()
+  if (FOUND_LIBM)
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jeanPerier wrote:

nit: in your cmake logic above, you usually do `if (FOUND_...) ... else() message(FATAL_ERROR ...) endif()`

https://github.com/llvm/llvm-project/pull/83874