clang-cl import std

Clang 19 allows to export redeclarations within language linkage.
llvm/llvm-project#98583

Exporting implicitly declared `type_info`/`operator new`/`operator delete` is no longer illegal.
llvm/llvm-project#90620

Clang 19.1.1 with VS 17.11 supports `import std`.
- llvm/llvm-project#108732
- microsoft/STL#4626

.github/workflows/build.yml

@@ -55,13 +55,13 @@ jobs:
         run: cmake -P workflow.cmake -- clang
 
       - name: clang-win32
-        run: make clang-win32 CXXFLAGS="-Xmicrosoft-windows-sys-root /opt/msvc -fuse-ld=lld -target x86_64-pc-windows-msvc" LAUNCHER="WINEDEBUG=-all wine "
+        run: make clang-win32 VCTOOLSINSTALLDIR=/opt/msvc CXXFLAGS="-Xmicrosoft-windows-sys-root /opt/msvc -fuse-ld=lld -target x86_64-pc-windows-msvc" LAUNCHER="WINEDEBUG=-all wine "
 
       - name: cmake x-clang-win32
         run: cmake -P workflow.cmake -- x-clang-win32
 
       - name: clang-cl
-        run: make clang-cl CXXFLAGS="-winsysroot /opt/msvc -fuse-ld=lld" LAUNCHER="WINEDEBUG=-all wine "
+        run: make clang-cl VCTOOLSINSTALLDIR=/opt/msvc CXXFLAGS="-winsysroot /opt/msvc -fuse-ld=lld" LAUNCHER="WINEDEBUG=-all wine "
 
       - name: gcc snapshot
         continue-on-error: true
@@ -96,7 +96,7 @@ jobs:
         run: |
           export PATH=/opt/compiler-explorer/clang-trunk/bin:$PATH
           export LD_LIBRARY_PATH=$(dirname $(clang -print-file-name=libc++.so)):$LD_LIBRARY_PATH
-          make clang-win32 CXXFLAGS="-Xmicrosoft-windows-sys-root /opt/msvc -fuse-ld=lld -target x86_64-pc-windows-msvc" LAUNCHER="WINEDEBUG=-all wine "
+          make clang-win32 VCTOOLSINSTALLDIR=/opt/msvc CXXFLAGS="-Xmicrosoft-windows-sys-root /opt/msvc -fuse-ld=lld -target x86_64-pc-windows-msvc" LAUNCHER="WINEDEBUG=-all wine "
 
       - name: cmake x-clang-win32 trunk
         continue-on-error: true
@@ -110,7 +110,7 @@ jobs:
         run: |
           export PATH=/opt/compiler-explorer/clang-trunk/bin:$PATH
           export LD_LIBRARY_PATH=$(dirname $(clang -print-file-name=libc++.so)):$LD_LIBRARY_PATH
-          make clang-cl CXXFLAGS="-winsysroot /opt/msvc -fuse-ld=lld" LAUNCHER="WINEDEBUG=-all wine "
+          make clang-cl VCTOOLSINSTALLDIR=/opt/msvc CXXFLAGS="-winsysroot /opt/msvc -fuse-ld=lld" LAUNCHER="WINEDEBUG=-all wine "
 
       - name: msvc-wine
         run: PATH=/opt/msvc/bin/x64:$PATH make msvc LAUNCHER="WINEDEBUG=-all wine " VCTOOLSINSTALLDIR=/opt/msvc

Makefile

@@ -20,13 +20,15 @@ clang-cl: \
 	module-partition/clang-cl \
 	module-impl/clang-cl \
 	header-unit/clang-cl \
+	import-std/clang-cl \
 	shared-lib/clang-cl \
 
 clang-win32: \
 	named-module/clang \
 	module-partition/clang \
 	module-impl/clang \
 	header-unit/clang \
+	import-std/clang-win32 \
 	shared-lib/clang-win32 \
 
 clang-mingw: \
@@ -55,6 +57,8 @@ TARGETS1 = \
 	header-unit/gcc \
 	import-std/msvc \
 	import-std/clang \
+	import-std/clang-win32 \
+	import-std/clang-cl \
 	shared-lib/msvc \
 	shared-lib/clang \
 	shared-lib/clang-win32 \

import-std/Makefile.clang-cl

@@ -0,0 +1,11 @@
+hello.exe: main.cpp std.obj std.pcm
+	clang-cl /EHsc /std:c++latest -fprebuilt-module-path=. -D__cpp_lib_modules=202207L main.cpp std.obj /Fe:hello $(CXXFLAGS)
+
+std.obj std.pcm:
+	clang-cl /EHsc /std:c++latest -Wno-reserved-module-identifier -Wno-include-angled-in-module-purview \
+	-fprebuilt-module-path=. -fmodule-output=std.pcm \
+	-c -x c++-module $(CXXFLAGS) -- "$(VCTOOLSINSTALLDIR)/modules/std.ixx"
+
+clean:
+	-del *.pcm *.obj *.exe
+	-rm  *.pcm *.obj *.exe

import-std/Makefile.clang-win32

@@ -0,0 +1,11 @@
+hello.exe: main.cpp std.o std.pcm
+	clang++ -std=c++23 -fprebuilt-module-path=. -D__cpp_lib_modules=202207L main.cpp std.o -o hello.exe $(CXXFLAGS)
+
+std.o std.pcm:
+	clang++ -std=c++23 -Wno-reserved-module-identifier -Wno-include-angled-in-module-purview \
+	-fprebuilt-module-path=. -fmodule-output=std.pcm \
+	-c -x c++-module "$(VCTOOLSINSTALLDIR)/modules/std.ixx" $(CXXFLAGS)
+
+clean:
+	-del *.pcm *.o *.exe
+	-rm  *.pcm *.o *.exe