gmio_core: get rid of alloca() support

CMakeLists.txt

@@ -103,20 +103,6 @@ if(NOT BUILD_STRICT_C90)
         message(WARNING "<sys/stat.h> does not provide 64b variant of fstat(), you may encounter problems with files > 2GB")
     endif()
 
-    # Have BSD-like alloca() function ?
-    check_c_source_compiles(
-        "#include <alloca.h>
-         int main() { void* ptr = alloca(256); return 0; }"
-        GMIO_HAVE_BSD_ALLOCA_FUNC)
-
-    # Have Win32 _alloca() function ?
-    if(WIN32)
-        check_c_source_compiles(
-            "#include <malloc.h>
-             int main() { void* ptr = _alloca(256); return 0; }"
-            GMIO_HAVE_WIN__ALLOCA_FUNC)
-    endif()
-
     # Have builtin byte swap functions ?
     if(CMAKE_COMPILER_IS_GNUCC)
         # __builtin_bswap16() is missing in x86 GCC version prior to v4.7

src/gmio_core/buffer.c

@@ -17,14 +17,6 @@
 
 #include <stdlib.h>
 
-#if defined(GMIO_HAVE_BSD_ALLOCA_FUNC)
-#  include <alloca.h>
-#elif defined(GMIO_HAVE_WIN__ALLOCA_FUNC)
-#  include "error.h"
-#  include <windows.h>
-#  include <malloc.h>
-#endif
-
 GMIO_INLINE gmio_buffer_t gmio_buffer_null()
 {
     gmio_buffer_t buff = { 0 };
@@ -56,30 +48,6 @@ gmio_buffer_t gmio_buffer_realloc(void* ptr, size_t size)
     return gmio_buffer(realloc(ptr, size), size, &free);
 }
 
-gmio_buffer_t gmio_buffer_alloca(size_t size)
-{
-#if defined(GMIO_HAVE_BSD_ALLOCA_FUNC)
-    return gmio_buffer(alloca(size), size, NULL);
-#elif defined(GMIO_HAVE_WIN__ALLOCA_FUNC)
-#  ifdef _MSC_VER
-    __try {
-        return gmio_buffer(_alloca(size), size, NULL);
-    }
-    __except(GetExceptionCode() == STATUS_STACK_OVERFLOW) {
-        /* The stack overflowed */
-        if (_resetstkoflw() == 0)
-            exit(GMIO_ERROR_UNKNOWN);
-        return gmio_buffer_null();
-    }
-#  else
-    return gmio_buffer(_alloca(size), size, NULL);
-#  endif /* _MSC_VER */
-#else
-    GMIO_UNUSED(size);
-    return gmio_buffer_null();
-#endif
-}
-
 void gmio_buffer_deallocate(gmio_buffer_t *buffer)
 {
     if (buffer != NULL && buffer->deallocate_func != NULL)

src/gmio_core/buffer.h

@@ -57,9 +57,6 @@ GMIO_LIB_EXPORT gmio_buffer_t gmio_buffer_calloc(size_t num, size_t size);
 /*! Returns a gmio_buffer object allocated with standard \c realloc() */
 GMIO_LIB_EXPORT gmio_buffer_t gmio_buffer_realloc(void* ptr, size_t size);
 
-/*! Returns a gmio_buffer object allocated with OS-specific \c alloca() */
-GMIO_LIB_EXPORT gmio_buffer_t gmio_buffer_alloca(size_t size);
-
 /*! Safe and convenient call to gmio_buffer::deallocate_func() */
 GMIO_LIB_EXPORT void gmio_buffer_deallocate(gmio_buffer_t* buffer);
 

src/gmio_core/config.h.cmake

@@ -37,10 +37,6 @@
 #cmakedefine GMIO_HAVE_POSIX_FSTAT64_FUNC
 #cmakedefine GMIO_HAVE_WIN__FSTAT64_FUNC
 
-/* alloca()-like */
-#cmakedefine GMIO_HAVE_BSD_ALLOCA_FUNC
-#cmakedefine GMIO_HAVE_WIN__ALLOCA_FUNC
-
 /* Compiler byte-swap functions */
 #cmakedefine GMIO_HAVE_GCC_BUILTIN_BSWAP16_FUNC
 #cmakedefine GMIO_HAVE_GCC_BUILTIN_BSWAP32_FUNC