error if using Enzyme with gcc/g++ (#1883)

* error if using Enzyme with gcc/g++ * nicer error * reduce error to warning * more precise warning message
EnzymeAD · May 15, 2024 · f5e66b2 · f5e66b2
1 parent cf89592
commit f5e66b2
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diff --git a/enzyme/cmake/EnzymeConfig.cmake.in b/enzyme/cmake/EnzymeConfig.cmake.in
@@ -1,5 +1,25 @@
 # - Config file for the Enzyme package
 
+get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)
+
+if("C" IN_LIST languages)
+    if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+        message("project languages: ${languages}")
+        message(WARNING "C compiler ID equals ${CMAKE_C_COMPILER_ID}\n"
+        "C compiler: ${CMAKE_C_COMPILER}\n"
+        "Using Enzyme without an LLVM based C compiler.")
+    endif()
+endif()
+
+if("CXX" IN_LIST languages)
+    if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+        message("project languages: ${languages}")
+        message(WARNING "C++ compiler equals ${CMAKE_CXX_COMPILER_ID}\n"
+        "C++ compiler: ${CMAKE_CXX_COMPILER}\n"
+        "Using Enzyme without an LLVM based C++ compiler.")
+    endif()
+endif()
+
 # Compute paths
 get_filename_component(Enzyme_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
 set(Enzyme_LLVM_VERSION_MAJOR "@CONF_LLVM_VERSION_MAJOR@")

diff --git a/enzyme/cmake/EnzymeConfigVersion.cmake.in b/enzyme/cmake/EnzymeConfigVersion.cmake.in
@@ -1,5 +1,25 @@
 set(PACKAGE_VERSION "@ENZYME_VERSION@")
 
+get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)
+
+if("C" IN_LIST languages)
+    if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+        message("project languages: ${languages}")
+        message(WARNING "C compiler ID equals ${CMAKE_C_COMPILER_ID}\n"
+        "C compiler: ${CMAKE_C_COMPILER}\n"
+        "Using Enzyme without an LLVM based C compiler.")
+    endif()
+endif()
+
+if("CXX" IN_LIST languages)
+    if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+        message("project languages: ${languages}")
+        message(WARNING "C++ compiler equals ${CMAKE_CXX_COMPILER_ID}\n"
+        "C++ compiler: ${CMAKE_CXX_COMPILER}\n"
+        "Using Enzyme without an LLVM based C++ compiler.")
+    endif()
+endif()
+
 # Check whether the requested PACKAGE_FIND_VERSION is compatible
 if("${PACKAGE_VERSION}" VERSION_LESS "${PACKAGE_FIND_VERSION}")
   set(PACKAGE_VERSION_COMPATIBLE FALSE)