Fix for GCC-15

CMakeLists.txt

@@ -132,6 +132,19 @@ set_target_properties(ALF
 # Use C++17
 target_compile_features(ALF PUBLIC cxx_std_17)
 
+# GCC 15 emits a false-positive -Wmaybe-uninitialized when it deeply inlines
+# Boost.Python's extract<std::string> rvalue converters (used in
+# PythonInterface.cxx and the Swt/Ic Python interface headers) into
+# std::pair/boost::variant construction. The warning points into libstdc++'s
+# bits/basic_string.h (_M_string_length) but is triggered by ALF's converters;
+# the code is correct. The aliBuild recipe compiles with -Werror, so this
+# false positive would otherwise be a hard failure. Keep the warning visible
+# but non-fatal. GCC-only: the flag is not understood by Clang/AppleClang, and
+# the Python interface is only built on non-APPLE (Python3_FOUND) anyway.
+target_compile_options(ALF PRIVATE
+  $<$<CXX_COMPILER_ID:GNU>:-Wno-error=maybe-uninitialized>
+)
+
 
 ####################################
 # Executables

src/IcPythonInterface.h

@@ -131,6 +131,12 @@ struct IcArgsVariantConverter {
 
     IcArgsVariant ret;
 
+    // GCC 15 emits a false-positive -Wmaybe-uninitialized when the std::string
+    // materialized from boost::python::extract<> is copied into the variant/pair.
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
     bp::extract<std::string> s(obj);
     if (s.check()) {
       ret = s();
@@ -144,6 +150,9 @@ struct IcArgsVariantConverter {
         ret = bp::extract<std::pair<std::string, uint32_t>>(tuple);
       }
     }
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 
     new (storage) IcArgsVariant(ret);
     data->convertible = storage;

src/PythonInterface.cxx

@@ -57,7 +57,16 @@ struct pairConverter {
   {
     bp::tuple tuple(bp::borrowed(obj));
     void* storage = ((bp::converter::rvalue_from_python_storage<std::pair<T1, T2>>*)data)->storage.bytes;
+    // GCC 15 emits a false-positive -Wmaybe-uninitialized when the std::string
+    // materialized from boost::python::extract<> is copied into the std::pair.
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
     new (storage) std::pair<T1, T2>(bp::extract<T1>(tuple[0]), bp::extract<T2>(tuple[1]));
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
     data->convertible = storage;
   }
 };

src/ScaPythonInterface.h

@@ -137,6 +137,12 @@ struct ScaArgsVariantConverter {
 
     ScaArgsVariant ret;
 
+    // GCC 15 emits a false-positive -Wmaybe-uninitialized when the std::string
+    // materialized from boost::python::extract<> is copied into the variant/pair.
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
     bp::extract<std::string> s(obj);
     if (s.check()) {
       ret = s();
@@ -150,6 +156,9 @@ struct ScaArgsVariantConverter {
         ret = bp::extract<std::pair<std::string, uint32_t>>(tuple);
       }
     }
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 
     new (storage) ScaArgsVariant(ret);
     data->convertible = storage;

src/SwtPythonInterface.h

@@ -132,13 +132,22 @@ struct SwtArgsVariantConverter {
 
     SwtArgsVariant ret;
 
+    // GCC 15 emits a false-positive -Wmaybe-uninitialized when the std::string
+    // materialized from boost::python::extract<> is copied into the variant/pair.
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
     bp::extract<std::string> s(obj);
     if (s.check()) {
       ret = s();
     } else {
       bp::tuple tuple(bp::borrowed(obj));
       ret = std::pair<std::string, uint32_t>(bp::extract<std::string>(tuple[0]), bp::extract<uint32_t>(tuple[1]));
     }
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 
     new (storage) SwtArgsVariant(ret);
     data->convertible = storage;