MSVC fixes round 2: address PierreChatelier feedback (#10)

1. -Wall -Wpedantic: wrapped in if(NOT MSVC) for all targets
2. dirent.h: minimal FindFirstFile-based opendir/readdir/closedir for MSVC
3. PTHREAD_MUTEX_INITIALIZER: switch to SRWLOCK + SRWLOCK_INIT
   (CRITICAL_SECTION has no static initializer equivalent)
4. Windows.h: added #include in tq_transformer.c for LARGE_INTEGER

35/35 tests pass, zero warnings on macOS.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: unamedkr

CMakeLists.txt

@@ -203,13 +203,13 @@ if(TQ_BUILD_ROCM)
     endif()
 endif()
 
-# Compiler warnings
-target_compile_options(turboquant PRIVATE
-    -Wall -Wextra -Wpedantic -Wno-unused-parameter
-)
-target_compile_options(turboquant_shared PRIVATE
-    -Wall -Wextra -Wpedantic -Wno-unused-parameter
-)
+# Compiler warnings (skip on MSVC — handled separately above)
+if(NOT MSVC)
+    target_compile_options(turboquant PRIVATE
+        -Wall -Wextra -Wpedantic -Wno-unused-parameter)
+    target_compile_options(turboquant_shared PRIVATE
+        -Wall -Wextra -Wpedantic -Wno-unused-parameter)
+endif()
 
 # Tests
 if(TQ_BUILD_TESTS)
@@ -289,7 +289,9 @@ if(TQ_BUILD_SERVER)
     if(NOT MSVC)
         target_link_libraries(quant-server m)
     endif()
-    target_compile_options(quant-server PRIVATE
-        -Wall -Wextra -Wpedantic -Wno-unused-parameter)
+    if(NOT MSVC)
+        target_compile_options(quant-server PRIVATE
+            -Wall -Wextra -Wpedantic -Wno-unused-parameter)
+    endif()
     message(STATUS "quant.cpp: HTTP server target enabled (quant-server)")
 endif()

src/engine/tq_generate.c

@@ -13,7 +13,15 @@
 #include <string.h>
 #include <math.h>
 #include <stdio.h>
+#ifdef _WIN32
+#include <windows.h>
+#define pthread_mutex_t SRWLOCK
+#define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
+#define pthread_mutex_lock(m) AcquireSRWLockExclusive(m)
+#define pthread_mutex_unlock(m) ReleaseSRWLockExclusive(m)
+#else
 #include <pthread.h>
+#endif
 
 /* ============================================================
  * Argmax sampling: return token with highest logit

src/engine/tq_model.c

@@ -31,6 +31,26 @@
 #define R_OK 4
 #endif
 #define access _access
+/* Minimal dirent.h for MSVC (FindFirstFile-based) */
+#ifndef _DIRENT_H_WIN32
+#define _DIRENT_H_WIN32
+struct dirent { char d_name[260]; };
+typedef struct { HANDLE h; WIN32_FIND_DATAA fd; int first; } DIR;
+static DIR* opendir(const char* p) {
+    char buf[270]; snprintf(buf, sizeof(buf), "%s\\*", p);
+    DIR* d = (DIR*)malloc(sizeof(DIR));
+    d->h = FindFirstFileA(buf, &d->fd); d->first = 1;
+    if (d->h == INVALID_HANDLE_VALUE) { free(d); return NULL; }
+    return d;
+}
+static struct dirent* readdir(DIR* d) {
+    static struct dirent e;
+    if (d->first) { d->first = 0; } else if (!FindNextFileA(d->h, &d->fd)) return NULL;
+    strncpy(e.d_name, d->fd.cFileName, 259); e.d_name[259] = 0;
+    return &e;
+}
+static void closedir(DIR* d) { FindClose(d->h); free(d); }
+#endif
 #else
 #include <sys/mman.h>
 #include <sys/stat.h>

src/engine/tq_ops.c

@@ -28,6 +28,19 @@ typedef CONDITION_VARIABLE pthread_cond_t;
 #define pthread_cond_destroy(c)  ((void)0)
 /* __thread → __declspec(thread) */
 #define __thread __declspec(thread)
+/* PTHREAD_MUTEX_INITIALIZER: SRWLOCK can be zero-initialized */
+typedef SRWLOCK pthread_mutex_srw_t;
+#undef pthread_mutex_t
+#define pthread_mutex_t SRWLOCK
+#undef pthread_mutex_init
+#define pthread_mutex_init(m, a) InitializeSRWLock(m)
+#undef pthread_mutex_lock
+#define pthread_mutex_lock(m)    AcquireSRWLockExclusive(m)
+#undef pthread_mutex_unlock
+#define pthread_mutex_unlock(m)  ReleaseSRWLockExclusive(m)
+#undef pthread_mutex_destroy
+#define pthread_mutex_destroy(m) ((void)0)
+#define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
 #else
 #include <pthread.h>
 #endif

src/engine/tq_transformer.c

@@ -30,6 +30,9 @@
 #ifdef __APPLE__
 #include <unistd.h> /* getpagesize, posix_memalign */
 #endif
+#ifdef _WIN32
+#include <windows.h> /* QueryPerformanceCounter, LARGE_INTEGER */
+#endif
 
 /* Unified Q2/1-bit matmul dispatch.
  * When model->use_1bit_weights, Q2 fields contain sign bits + norms,