Fix Windows CI: timespec double-guard + exclude server on MSVC

Author: unamedkr

CMakeLists.txt

@@ -280,8 +280,8 @@ foreach(ex_src ${EXAMPLE_C_SOURCES} ${EXAMPLE_CXX_SOURCES})
     target_link_libraries(${ex_name} turboquant)
 endforeach()
 
-# OpenAI-compatible HTTP server
-if(TQ_BUILD_SERVER)
+# OpenAI-compatible HTTP server (POSIX only — uses sys/socket.h)
+if(TQ_BUILD_SERVER AND NOT MSVC)
     add_executable(quant-server src/server/tq_server.c)
     target_include_directories(quant-server PRIVATE
         ${CMAKE_SOURCE_DIR}/src/server

quant.h

@@ -144,8 +144,9 @@ typedef volatile long atomic_int;
 #ifndef CLOCK_MONOTONIC
 #define CLOCK_MONOTONIC 1
 #endif
-#ifndef _TIMESPEC_DEFINED
-#define _TIMESPEC_DEFINED
+#if !defined(_TIMESPEC_DEFINED) && !defined(__struct_timespec_defined)
+#define _TIMESPEC_DEFINED 1
+#define __struct_timespec_defined 1
 struct timespec { long tv_sec; long tv_nsec; };
 #endif
 static inline int clock_gettime(int id, struct timespec* ts) {

tools/quant.c

@@ -43,8 +43,9 @@
 #ifndef CLOCK_MONOTONIC
 #define CLOCK_MONOTONIC 1
 #endif
-#if defined(_WIN32) && !defined(_TIMESPEC_DEFINED)
-#define _TIMESPEC_DEFINED
+#if defined(_WIN32) && !defined(_TIMESPEC_DEFINED) && !defined(__struct_timespec_defined)
+#define _TIMESPEC_DEFINED 1
+#define __struct_timespec_defined 1
 struct timespec { long tv_sec; long tv_nsec; };
 #endif
 static int clock_gettime(int id, struct timespec* ts) {