Compilation error on Archlinux with cmake=4.0.3

[mschubert]

I'm getting the following error from cmake (version 4.0.3) on Arch Linux:

-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at /usr/share/cmake/Modules/Internal/CheckSourceCompiles.cmake:47 (message):
  check_source_compiles: C: needs to be enabled before use.
Call Stack (most recent call first):
  /usr/share/cmake/Modules/CheckCSourceCompiles.cmake:58 (cmake_check_source_compiles)
  CMakeModules/FindLIBXML.cmake:115 (CHECK_C_SOURCE_COMPILES)
  /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:78 (find_package)
  /usr/lib/cmake/sbml-static-config.cmake:14 (find_dependency)
  CMakeModules/FindLIBSBML.cmake:40 (find_package)
  CMakeLists.txt:341 (find_package)

I can make compilation succeed with the following change in libSEDML's CMakeLists.txt:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9b8f477..55064e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,7 +73,7 @@ set(LIBSEDML_DOTTED_VERSION ${LIBSEDML_VERSION})
 set(PACKAGE_NAME "libSEDML")
 
 project (libsedml VERSION "${LIBSEDML_VERSION_MAJOR}.${LIBSEDML_VERSION_MINOR}.${LIBSEDML_VERSION_PATCH}"
-                  LANGUAGES CXX)
+                  LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED YES)

However, there may be a better solution given the CMake traceback.

[fbergmann]

thanks for letting me know! It would probably be fine to enable the C Language just for the libxml find module. But I'll be sure to have a look and make a new release for it.