Check for Fortran support to conditionally build target

schwitanski · schwitanski · commit 8f6dc3e59af2 · 2025-05-03T11:19:23.000+02:00
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -15,7 +15,19 @@ cmake_minimum_required(VERSION 3.10)
 #
 # project information
 #
-project("test" LANGUAGES C Fortran)
+project("test" LANGUAGES C)
+
+#
+# check for fortran support
+#
+include(CheckLanguage)
+check_language(Fortran)
+if(CMAKE_Fortran_COMPILER)
+  enable_language(Fortran)
+  message(STATUS "Fortran compiler found: ${CMAKE_Fortran_COMPILER}")
+else()
+  message(STATUS "No Fortran support, will be disabled.")
+endif()
 
 
 #
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -13,4 +13,7 @@
 add_subdirectory(libfoo)
 add_subdirectory(bar)
 add_subdirectory(libheader)
-add_subdirectory(fortran)
+
+if(CMAKE_Fortran_COMPILER)
+    add_subdirectory(fortran)
+endif()

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,19 @@ cmake_minimum_required(VERSION 3.10)`
`15`	`15`	`#`
`16`	`16`	`# project information`
`17`	`17`	`#`
`18`		`-project("test" LANGUAGES C Fortran)`
	`18`	`+project("test" LANGUAGES C)`
	`19`	`+`
	`20`	`+#`
	`21`	`+# check for fortran support`
	`22`	`+#`
	`23`	`+include(CheckLanguage)`
	`24`	`+check_language(Fortran)`
	`25`	`+if(CMAKE_Fortran_COMPILER)`
	`26`	`+ enable_language(Fortran)`
	`27`	`+ message(STATUS "Fortran compiler found: ${CMAKE_Fortran_COMPILER}")`
	`28`	`+else()`
	`29`	`+ message(STATUS "No Fortran support, will be disabled.")`
	`30`	`+endif()`
`19`	`31`
`20`	`32`
`21`	`33`	`#`