From 0f5141979a5f025678cfad4f14cb9a6c43d8d2ec Mon Sep 17 00:00:00 2001
From: Hugues Delorme <delorme.hugues@fougsys.fr>
Date: Fri, 3 Apr 2015 15:12:58 +0200
Subject: [PATCH] cmake: on UNIX systems force 64b overrides of stat(),
 fstat(), ...

---
 CMakeLists.txt         | 35 ++++++++++++++++++++++++++++++++++-
 src/gmio_core/stream.c |  9 ---------
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2650bdc..8ad8289 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,14 +62,47 @@ if(NOT BUILD_STRICT_C90)
     check_include_files(stdbool.h GMIO_HAVE_STDBOOL_H)
 
     # Check POSIX features
+    if(UNIX)
+        # See:
+        #     http://linux.die.net/man/2/fstat64
+        #     https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man2/fstat.2.html
+        #     https://www.gnu.org/software/libc/manual/html_mono/libc.html#Feature-Test-Macros
+        if(APPLE)
+            add_definitions(-D_DARWIN_USE_64_BIT_INODE)
+        else()
+            add_definitions(-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE)
+        endif()
+    endif()
+
     check_include_files(sys/types.h GMIO_HAVE_SYS_TYPES_H)
     check_include_files(sys/stat.h GMIO_HAVE_SYS_STAT_H)
     check_function_exists(fileno GMIO_HAVE_POSIX_FILENO_FUNC)
-    check_function_exists(fstat64 GMIO_HAVE_POSIX_FSTAT64_FUNC)
+    # Have POSIX fstat64() ?
+    check_c_source_compiles(
+        "#include <sys/stat.h>
+         int main() { fstat64(0, NULL); return 0; }"
+        GMIO_HAVE_POSIX_FSTAT64_FUNC)
     if(WIN32)
         check_function_exists(_fstat64 GMIO_HAVE_WIN__FSTAT64_FUNC)
     endif()
 
+    # Check sizeof(struct stat[64])
+    set(CMAKE_EXTRA_INCLUDE_FILES sys/stat.h)
+    if(GMIO_HAVE_WIN__FSTAT64_FUNC)
+        check_type_size("((struct _stat64*)0)->st_size" GMIO_SIZEOF_STRUCT_STAT_ST_SIZE)
+    elsif(GMIO_HAVE_POSIX_FSTAT64_FUNC)
+        check_type_size("((struct stat64*)0)->st_size" GMIO_SIZEOF_STRUCT_STAT_ST_SIZE)
+    else()
+        check_type_size("((struct stat*)0)->st_size" GMIO_SIZEOF_STRUCT_STAT_ST_SIZE)
+    endif()
+    set(CMAKE_EXTRA_INCLUDE_FILES)
+
+    if(GMIO_HAVE_SYS_STAT_H
+           AND NOT(GMIO_SIZEOF_STRUCT_STAT_ST_SIZE STREQUAL "0") # Not arch-dependent size
+           AND NOT(GMIO_SIZEOF_STRUCT_STAT_ST_SIZE EQUAL 8))
+        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>
diff --git a/src/gmio_core/stream.c b/src/gmio_core/stream.c
index 1899305..61fb13f 100644
--- a/src/gmio_core/stream.c
+++ b/src/gmio_core/stream.c
@@ -20,15 +20,6 @@
 #include <stdlib.h>
 
 #if defined(GMIO_HAVE_SYS_TYPES_H) && defined(GMIO_HAVE_SYS_STAT_H)
-
-/* For some platforms maybe it's better to override stat(), fstat(), etc. with
- * 64bit variants. See:
- *   http://linux.die.net/man/2/fstat64
- *       #define _FILE_OFFSET_BITS 64
- *   https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man2/fstat.2.html
- *       #define _DARWIN_USE_64_BIT_INODE
- */
-
 #  include <sys/types.h>
 #  include <sys/stat.h>