compat UPDATE include alloca.h

Author: michalvasko

CMakeModules/UseCompat.cmake

@@ -59,6 +59,8 @@ macro(USE_COMPAT)
     check_symbol_exists(mmap "sys/mman.h" HAVE_MMAP)
     check_symbol_exists(setenv "stdlib.h" HAVE_SETENV)
 
+    check_include_file("alloca.h" HAVE_ALLOCA_H)
+
     list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_POSIX_C_SOURCE=200809L)
     list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
     list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D__BSD_VISIBLE=1)

compat/compat.h.in

@@ -3,7 +3,7 @@
  * @author Michal Vasko <[email protected]>
  * @brief compatibility functions header
  *
- * Copyright (c) 2021 - 2023 CESNET, z.s.p.o.
+ * Copyright (c) 2021 - 2025 CESNET, z.s.p.o.
  *
  * This source code is licensed under BSD 3-Clause License (the "License").
  * You may not use this file except in compliance with the License.
@@ -21,6 +21,11 @@
 # include <ws2tcpip.h>
 #endif
 
+#cmakedefine HAVE_ALLOCA_H
+#ifdef HAVE_ALLOCA_H
+# include <alloca.h>
+#endif
+
 #include <limits.h>
 #include <pthread.h>
 #include <stdarg.h>