Try windows

.github/workflows/main.yaml

@@ -8,7 +8,7 @@ on:
   workflow_dispatch: {}
 
 env:
-  CACHE_VERSION: 0
+  CACHE_VERSION: 1
 
 # only run one copy per PR
 concurrency:
@@ -37,6 +37,26 @@ jobs:
           path: ./stan/
           key: ${{ runner.os }}-stan-${{ hashFiles('stan/src/stan/version.hpp') }}-v${{ env.CACHE_VERSION }}
 
+
+      - name: Set up PATH for C example
+        if: matrix.os == 'windows-latest'
+        run: |
+          Add-Content $env:GITHUB_PATH "$(pwd)/stan/lib/stan_math/lib/tbb"
+          Add-Content $env:GITHUB_PATH "$(pwd)/test_models/full"
+
+
+      - name: Build C example (Windows)
+        if: matrix.os == 'windows-latest'
+        run: |
+          cd c-example/
+          make -j4 example.exe example_runtime.exe
+          rm ../src/bridgestan.o
+
+          echo "Dynamically linked example"
+          ./example.exe
+          echo "Runtime loading example"
+          ./example_runtime.exe ../test_models/full/full_model.so
+
       - name: Build C example (Unix)
         if: matrix.os != 'windows-latest'
         run: |

c-example/Makefile

@@ -4,11 +4,17 @@ include ../Makefile
 
 MODEL?=full
 CC = gcc
+# .dll on Windows, .so on Linux
+ifeq ($(OS_TAG),windows)
+	DLL = dll
+else
+	DLL = so
+endif
 
-../test_models/$(MODEL)/lib$(MODEL)_model.so: ../test_models/$(MODEL)/$(MODEL)_model.so
-	cp ../test_models/$(MODEL)/$(MODEL)_model.so ../test_models/$(MODEL)/lib$(MODEL)_model.so
+../test_models/$(MODEL)/lib$(MODEL)_model.$(DLL): ../test_models/$(MODEL)/$(MODEL)_model.so
+	cp ../test_models/$(MODEL)/$(MODEL)_model.so ../test_models/$(MODEL)/lib$(MODEL)_model.$(DLL)
 
-example$(EXE): example.c ../test_models/$(MODEL)/lib$(MODEL)_model.so
+example$(EXE): example.c ../test_models/$(MODEL)/lib$(MODEL)_model.$(DLL)
 	$(CC) -c -I ../src example.c -o example.o
 	$(LINK.c) -o example$(EXE) example.o -Wl,-rpath ../test_models/$(MODEL) -L ../test_models/$(MODEL) -l$(MODEL)_model
 	$(RM) example.o
@@ -30,4 +36,4 @@ example_static$(EXE):  example.c ../test_models/$(MODEL)/$(MODEL)_model.a
 	$(RM) example.o
 
 example_runtime$(EXE): runtime_loading.c
-	$(CC) -I ../src runtime_loading.c -o example_runtime$(EXE) -ldl
+	$(CC) -I ../src runtime_loading.c -o example_runtime$(EXE)

c-example/runtime_loading.c

@@ -1,6 +1,24 @@
 #include "bridgestan.h"
 #include <stdio.h>
+
+#ifdef _WIN32
+// hacky way to get dlopen and friends on Windows
+
+#include <libloaderapi.h>
+#include <errhandlingapi.h>
+#define dlopen(lib, flags) LoadLibraryA(lib)
+#define dlsym(handle, sym) GetProcAddress(handle, sym)
+
+char* dlerror() {
+  DWORD err = GetLastError();
+  int length = snprintf(NULL, 0, "%d", err);
+  char* str = malloc(length + 1);
+  snprintf(str, length + 1, "%d", err);
+  return str;
+}
+#else
 #include <dlfcn.h>
+#endif
 
 #if __STDC_VERSION__ < 202000
 #define typeof __typeof__
@@ -34,8 +52,8 @@ int main(int argc, char** argv) {
   int patch = *(int*)dlsym(handle, "bs_patch_version");
   fprintf(stderr, "Using BridgeStan version %d.%d.%d\n", major, minor, patch);
 
-  // Get function pointers. Uses C23's typeof to re-use bridgestan.h definitions.
-  // We could also write out the types and not include bridgestan.h
+  // Get function pointers. Uses C23's typeof to re-use bridgestan.h
+  // definitions. We could also write out the types and not include bridgestan.h
   typeof(&bs_model_construct) bs_model_construct
       = dlsym(handle, "bs_model_construct");
   typeof(&bs_free_error_msg) bs_free_error_msg
@@ -45,6 +63,12 @@ int main(int argc, char** argv) {
   typeof(&bs_name) bs_name = dlsym(handle, "bs_name");
   typeof(&bs_param_num) bs_param_num = dlsym(handle, "bs_param_num");
 
+  if (!bs_model_construct || !bs_free_error_msg || !bs_model_destruct ||
+      !bs_name || !bs_param_num) {
+    fprintf(stderr, "Error: %s\n", dlerror());
+    return 1;
+  }
+
   // from here on, the code is exactly the same as example.c
 
   // this could potentially error, and we may get information back about why.