[trunk] activate LargeFileSupport in CMake

4 files changed, 165 insertions, 0 deletions

diff --git a/CMake/TestFileOffsetBits.c b/CMake/TestFileOffsetBits.c
new file mode 100644
index 00000000..993b2da4
--- /dev/null
+++ b/CMake/TestFileOffsetBits.c
@@ -0,0 +1,10 @@
+#include <sys/types.h>
+
+int main(int argc, char **argv)
+{
+  /* Cause a compile-time error if off_t is smaller than 64 bits */
+#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+  int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ];  
+  return 0;
+}
+
diff --git a/CMake/TestLargeFiles.c.cmake.in b/CMake/TestLargeFiles.c.cmake.in
new file mode 100644
index 00000000..82691032
--- /dev/null
+++ b/CMake/TestLargeFiles.c.cmake.in
@@ -0,0 +1,24 @@
+#cmakedefine _LARGEFILE_SOURCE
+#cmakedefine _LARGEFILE64_SOURCE
+#cmakedefine _LARGE_FILES
+#cmakedefine _FILE_OFFSET_BITS 
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+  /* Cause a compile-time error if off_t is smaller than 64 bits,
+   * and make sure we have ftello / fseeko.
+   */
+#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+  int off_t_is_large[ (LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1 ];  
+  FILE *fp = fopen(argv[0],"r");
+  off_t offset = ftello( fp );
+
+  fseeko( fp, offset, SEEK_CUR );
+  fclose(fp);
+  return 0;
+}
+
diff --git a/CMake/TestLargeFiles.cmake b/CMake/TestLargeFiles.cmake
new file mode 100644
index 00000000..96159d69
--- /dev/null
+++ b/CMake/TestLargeFiles.cmake
@@ -0,0 +1,120 @@
+# - Define macro to check large file support
+#
+#  OPJ_TEST_LARGE_FILES(VARIABLE)
+#
+#  VARIABLE will be set to true if off_t is 64 bits, and fseeko/ftello present.
+#  This macro will also set defines necessary enable large file support, for instance
+#  _LARGE_FILES
+#  _LARGEFILE_SOURCE
+#  _FILE_OFFSET_BITS 64  
+#  HAVE_FSEEKO
+#
+#  However, it is YOUR job to make sure these defines are set in a CMakedefine so they
+#  end up in a config.h file that is included in your source if necessary!
+
+MACRO(OPJ_TEST_LARGE_FILES VARIABLE)
+    IF(NOT DEFINED ${VARIABLE})
+
+        # On most platforms it is probably overkill to first test the flags for 64-bit off_t,
+        # and then separately fseeko. However, in the future we might have 128-bit filesystems
+        # (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
+
+        MESSAGE(STATUS "Checking for 64-bit off_t")
+
+        # First check without any special flags
+        TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"    
+                    "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c")
+        if(FILE64_OK)
+          MESSAGE(STATUS "Checking for 64-bit off_t - present")			
+      	endif(FILE64_OK)
+
+        if(NOT FILE64_OK)	
+            # Test with _FILE_OFFSET_BITS=64
+            TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
+                        "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c"
+                        COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" )
+            if(FILE64_OK)
+                MESSAGE(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64")
+                set(_FILE_OFFSET_BITS 64)
+            endif(FILE64_OK)
+        endif(NOT FILE64_OK)    
+
+        if(NOT FILE64_OK)
+            # Test with _LARGE_FILES
+            TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
+                        "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c"
+                        COMPILE_DEFINITIONS "-D_LARGE_FILES" )
+            if(FILE64_OK)
+                MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES")
+                set(_LARGE_FILES 1)
+            endif(FILE64_OK)
+        endif(NOT FILE64_OK)
+	
+        if(NOT FILE64_OK)
+            # Test with _LARGEFILE_SOURCE
+            TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
+                        "${PROJECT_SOURCE_DIR}/CMake/TestFileOffsetBits.c"
+                        COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
+            if(FILE64_OK)
+                MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE")
+      		      	       set(_LARGEFILE_SOURCE 1)
+            endif(FILE64_OK)
+        endif(NOT FILE64_OK)
+
+        if(NOT FILE64_OK)
+            # now check for Windows stuff
+            TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
+                        "${PROJECT_SOURCE_DIR}/CMake/TestWindowsFSeek.c")
+            if(FILE64_OK)
+                MESSAGE(STATUS "Checking for 64-bit off_t - present with _fseeki64")
+                set(HAVE__FSEEKI64 1)
+            endif(FILE64_OK)
+        endif(NOT FILE64_OK)
+
+        if(NOT FILE64_OK)
+            MESSAGE(STATUS "Checking for 64-bit off_t - not present")
+        else(NOT FILE64_OK)
+
+            # Set the flags we might have determined to be required above
+            configure_file("${PROJECT_SOURCE_DIR}/CMake/TestLargeFiles.c.cmake.in" 
+                           "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
+
+            MESSAGE(STATUS "Checking for fseeko/ftello")            
+	    # Test if ftello/fseeko are	available
+	    TRY_COMPILE(FSEEKO_COMPILE_OK "${PROJECT_BINARY_DIR}"
+                        "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
+	    if(FSEEKO_COMPILE_OK)
+                MESSAGE(STATUS "Checking for fseeko/ftello - present")
+            endif(FSEEKO_COMPILE_OK)
+
+            if(NOT FSEEKO_COMPILE_OK)
+                # glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...)
+                TRY_COMPILE(FSEEKO_COMPILE_OK "${PROJECT_BINARY_DIR}"
+                            "${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c"
+                            COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
+                if(FSEEKO_COMPILE_OK)
+                    MESSAGE(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE")
+                    set(_LARGEFILE_SOURCE 1)
+                endif(FSEEKO_COMPILE_OK)
+            endif(NOT FSEEKO_COMPILE_OK)
+
+        endif(NOT FILE64_OK)
+
+	    if(FSEEKO_COMPILE_OK)
+                SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
+                set(HAVE_FSEEKO 1)
+        else(FSEEKO_COMPILE_OK)
+			if (HAVE__FSEEKI64)
+				SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
+				SET(HAVE__FSEEKI64 1 CACHE INTERNAL "Windows 64-bit fseek" FORCE)
+			else (HAVE__FSEEKI64)
+                MESSAGE(STATUS "Checking for fseeko/ftello - not found")
+                SET(${VARIABLE} 0 CACHE INTERNAL "Result of test for large file support" FORCE)
+			endif (HAVE__FSEEKI64)
+        endif(FSEEKO_COMPILE_OK)
+
+    ENDIF(NOT DEFINED ${VARIABLE})
+ENDMACRO(OPJ_TEST_LARGE_FILES VARIABLE)
+
+
+
diff --git a/CMake/TestWindowsFSeek.c b/CMake/TestWindowsFSeek.c
new file mode 100644
index 00000000..ad9f0be1
--- /dev/null
+++ b/CMake/TestWindowsFSeek.c
@@ -0,0 +1,11 @@
+
+#include <stdio.h>
+    
+int main()
+{
+  __int64 off=0;
+
+  _fseeki64(NULL, off, SEEK_SET);
+        
+  return 0;
+}