CheckIPOSupported: Add Fortran support

Modules/CheckIPOSupported.cmake

@@ -93,11 +93,14 @@ macro(_ipo_run_language_check language)
 
   string(COMPARE EQUAL "${language}" "C" is_c)
   string(COMPARE EQUAL "${language}" "CXX" is_cxx)
+  string(COMPARE EQUAL "${language}" "Fortran" is_fortran)
 
   if(is_c)
     set(copy_sources foo.c main.c)
   elseif(is_cxx)
     set(copy_sources foo.cpp main.cpp)
+  elseif(is_fortran)
+    set(copy_sources foo.f main.f)
   else()
     message(FATAL_ERROR "Language not supported")
   endif()
@@ -204,12 +207,6 @@ function(check_ipo_supported)
     endif()
   endif()
 
-  list(FIND languages "Fortran" result)
-  if(NOT result EQUAL -1)
-    _ipo_not_supported("Fortran is not supported")
-    return()
-  endif()
-
   if(NOT _CMAKE_IPO_SUPPORTED_BY_CMAKE)
     _ipo_not_supported("CMake doesn't support IPO for current compiler")
     return()

Modules/CheckIPOSupported/CMakeLists-Fortran.txt.in

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION "@CMAKE_VERSION@")
+project("@TRY_COMPILE_PROJECT_NAME@" LANGUAGES Fortran)
+
+cmake_policy(SET CMP0069 NEW)
+
+add_library(foo foo.f)
+add_executable(boo main.f)
+target_link_libraries(boo PUBLIC foo)

Modules/CheckIPOSupported/foo.f

@@ -0,0 +1,2 @@
+	SUBROUTINE FOO
+	END

Modules/CheckIPOSupported/main.f

@@ -0,0 +1,3 @@
+	PROGRAM BOO
+	CALL FOO()
+	END

Tests/RunCMake/CheckIPOSupported/RunCMakeTest.cmake

@@ -2,7 +2,6 @@ include(RunCMake)
 
 run_cmake(unparsed-arguments)
 run_cmake(user-lang-unknown)
-run_cmake(user-lang-fortran)
 run_cmake(default-lang-none)
 run_cmake(not-supported-by-cmake)
 run_cmake(not-supported-by-compiler)

Tests/RunCMake/CheckIPOSupported/user-lang-fortran-result.txt

@@ -1 +0,0 @@
-1

Tests/RunCMake/CheckIPOSupported/user-lang-fortran-stderr.txt

@@ -1,6 +0,0 @@
-^CMake Error at .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(message\):
-  IPO is not supported \(Fortran is not supported\)\.
-Call Stack \(most recent call first\):
-  .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(_ipo_not_supported\)
-  user-lang-fortran\.cmake:[0-9]+ \(check_ipo_supported\)
-  CMakeLists\.txt:[0-9]+ \(include\)$

Tests/RunCMake/CheckIPOSupported/user-lang-fortran.cmake

@@ -1 +0,0 @@
-check_ipo_supported(LANGUAGES "Fortran")