[flang] Fix -intrinsic-module-directory in flang script

The flang wrapper script that was created as bin/flang in an in-tree
build did not have a correct -intrinsic-module-directory option.
It was correct for out-of-tree builds and for both kinds of installs.

The fix is to pick the correct directory based on what exists.

The script is no longer configured by cmake (just copied) so that
mechanism can be deleted from the cmake file.

Differential Revision: https://reviews.llvm.org/D93496

Author: tskeith

flang/tools/f18/CMakeLists.txt

@@ -65,28 +65,12 @@ add_custom_target(module_files ALL DEPENDS ${MODULE_FILES})
 
 install(TARGETS f18 DESTINATION bin)
 
-set(FLANG_INTRINSIC_MODULES_DIR ${FLANG_BINARY_DIR}/include/flang)
-
 # This flang shell script will only work in a POSIX shell.
 if (NOT WIN32)
-  if (FLANG_STANDALONE_BUILD)
-    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/flang.sh.in ${CMAKE_BINARY_DIR}/tools/flang/bin/flang @ONLY)
-    file(COPY ${CMAKE_BINARY_DIR}/tools/flang/bin/flang DESTINATION ${CMAKE_BINARY_DIR}/bin FILE_PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE)
-  else()
-    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/flang.sh.in
-      ${CMAKE_CURRENT_BINARY_DIR}/tools/flang/bin/flang @ONLY)
-    add_custom_command(TARGET f18
-        POST_BUILD
-          COMMAND ${CMAKE_COMMAND} -E copy
-          ${CMAKE_CURRENT_BINARY_DIR}/tools/flang/bin/flang
-          ${LLVM_RUNTIME_OUTPUT_INTDIR}/flang
-            COMMAND chmod +x ${LLVM_RUNTIME_OUTPUT_INTDIR}/flang)
-  endif()
+  file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/flang
+    DESTINATION ${CMAKE_BINARY_DIR}/bin
+    FILE_PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE)
+  install(PROGRAMS ${CMAKE_BINARY_DIR}/bin/flang DESTINATION bin)
 endif()
 
-# The flang script to be installed needs a different path to the headers.
-set(FLANG_INTRINSIC_MODULES_DIR ${CMAKE_INSTALL_PREFIX}/include/flang)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/flang.sh.in ${FLANG_BINARY_DIR}/bin/flang-install.sh @ONLY)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/f18_version.h.in ${CMAKE_CURRENT_BINARY_DIR}/f18_version.h @ONLY)
-
-install(PROGRAMS ${FLANG_BINARY_DIR}/bin/flang-install.sh DESTINATION bin RENAME flang)

flang/tools/f18/flang

@@ -0,0 +1,15 @@
+#!/bin/bash
+#===-- tools/f18/flang.sh -----------------------------------------*- sh -*-===#
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===------------------------------------------------------------------------===#
+
+wd=$(cd $(dirname "$0")/.. && pwd)
+module_dir=$wd/include/flang
+if [[ ! -d $module_dir ]]; then
+  module_dir=$wd/tools/flang/include/flang
+fi
+$wd/bin/f18 -module-suffix .f18.mod -intrinsic-module-directory $module_dir "$@"