Adjust ext.amgcl module for GCC and mute thread-safety

Author: Luohaothu

.github/workflows/Build.yml

@@ -132,9 +132,9 @@ jobs:
               libcxx_inc_path=$(dpkg -L libc++-21-dev | grep -m1 'std/algorithm.inc$' || true)
               if [ -n "$libcxx_inc_path" ]; then
                 libcxx_inc_root=$(dirname "$(dirname "$libcxx_inc_path")")
-                CXXFLAGS="-stdlib=libc++ -isystem $libcxx_inc_root"
+                CXXFLAGS="-stdlib=libc++ -isystem $libcxx_inc_root -Wno-thread-safety"
               else
-                CXXFLAGS="-stdlib=libc++ -isystem /usr/include/c++/v1 -isystem /usr/lib/llvm-21/include/c++/v1"
+                CXXFLAGS="-stdlib=libc++ -isystem /usr/include/c++/v1 -isystem /usr/lib/llvm-21/include/c++/v1 -Wno-thread-safety"
               fi
               echo "CC=clang-21" >> "$GITHUB_ENV"
               echo "CXX=clang++-21" >> "$GITHUB_ENV"
@@ -154,7 +154,7 @@ jobs:
               echo "CC=$LLVM_HOME/bin/clang" >> "$GITHUB_ENV"
               echo "CXX=$LLVM_HOME/bin/clang++" >> "$GITHUB_ENV"
               echo "$LLVM_HOME/bin" >> "$GITHUB_PATH"
-              echo "CXXFLAGS=-stdlib=libc++ -isystem $LLVM_HOME/include/c++/v1" >> "$GITHUB_ENV"
+              echo "CXXFLAGS=-stdlib=libc++ -isystem $LLVM_HOME/include/c++/v1 -Wno-thread-safety" >> "$GITHUB_ENV"
               echo "LDFLAGS=-stdlib=libc++ -L$LLVM_HOME/lib -Wl,-rpath,$LLVM_HOME/lib" >> "$GITHUB_ENV"
               modules_json=$(find "$LLVM_HOME" -name libc++.modules.json -print -quit || true)
               if [ -n "$modules_json" ]; then

src/amgcl.cppm

@@ -44,7 +44,11 @@ module;
 #include <amgcl/mpi/partition/ptscotch.hpp>
 #endif
 
+#if defined(__GNUC__) && !defined(__clang__)
+module ext.amgcl;
+#else
 export module ext.amgcl;
+#endif
 
 #if defined(__GNUC__) && !defined(__clang__)
 namespace amgcl {

src/opflow.cppm

@@ -19,9 +19,7 @@ module;
 #include <iostream>
 
 export module opflow;
-#if defined(__GNUC__) && !defined(__clang__)
-import ext.amgcl;
-#else
+#if !defined(__GNUC__) || defined(__clang__)
 export import ext.amgcl;
 #endif