fix(windows): missing codecvt link

Author: Daniele Briggi

.github/workflows/main.yml

@@ -88,6 +88,21 @@ jobs:
           pacman -S --noconfirm git
         shell: msys2 {0}
 
+      - name: windows check compiler versions
+        if: matrix.os == 'windows-latest'
+        run: |
+          echo "=== Compiler Versions ==="
+          gcc --version
+          g++ --version
+          echo "=== C++17 Feature Test ==="
+          echo '#include <iostream>' > test.cpp
+          echo '#include <codecvt>' >> test.cpp
+          echo '#include <locale>' >> test.cpp
+          echo 'int main() { std::codecvt_utf8_utf16<wchar_t> conv; return 0; }' >> test.cpp
+          g++ -std=c++17 -c test.cpp 2>&1 || echo "C++17 codecvt not supported"
+          rm -f test.cpp test.o
+        shell: msys2 {0}
+
       - name: windows build sqlite-ai
         if: matrix.name == 'windows'
         run: make extension ${{ matrix.make && matrix.make || ''}}

Makefile

@@ -28,6 +28,7 @@ MAKEFLAGS += -j$(CPUS)
 CC = gcc
 CXX = g++
 CFLAGS = -Wall -Wextra -Wno-unused-parameter -I$(SRC_DIR) -I$(LLAMA_DIR)/ggml/include -I$(LLAMA_DIR)/include
+CXXFLAGS = -std=c++17 -Wall -Wextra -Wno-unused-parameter -I$(SRC_DIR) -I$(LLAMA_DIR)/ggml/include -I$(LLAMA_DIR)/include
 LDFLAGS = -L./$(BUILD_LLAMA)/common -L./$(BUILD_LLAMA)/ggml/src -L./$(BUILD_LLAMA)/src -L./$(BUILD_WHISPER)/src -lcommon -lggml -lggml-cpu -lggml-base -lllama -lwhisper
 LLAMA_OPTIONS = $(LLAMA) -DLLAMA_CURL=OFF -DLLAMA_BUILD_EXAMPLES=OFF -DLLAMA_BUILD_TESTS=OFF -DLLAMA_BUILD_TOOLS=OFF -DLLAMA_BUILD_SERVER=OFF
 WHISPER_OPTIONS = $(WHISPER) -DWHISPER_BUILD_EXAMPLES=OFF -DWHISPER_BUILD_TESTS=OFF -DWHISPER_BUILD_SERVER=OFF
@@ -55,6 +56,9 @@ ifeq ($(PLATFORM),windows)
     # Create .def file for Windows
     DEF_FILE := $(BUILD_DIR)/ai.def
     STRIP = strip --strip-unneeded $@
+    # Windows-specific flags to work around MinGW codecvt issues
+    LLAMA_OPTIONS += -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1 -DGGML_USE_UNICODE=0"
+    WHISPER_OPTIONS += -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1"
 else ifeq ($(PLATFORM),macos)
     TARGET := $(DIST_DIR)/ai.dylib
     LLAMA_LIBS += $(BUILD_LLAMA)/ggml/src/ggml-metal/libggml-metal.a $(BUILD_LLAMA)/ggml/src/ggml-blas/libggml-blas.a