Added a check for signed char.

CMakeLists.txt

@@ -997,8 +997,24 @@ MARK_AS_ADVANCED(ENABLE_DOXYGEN_BUILD_RELEASE_DOCS DOXYGEN_ENABLE_TASKS ENABLE_D
 # Option checks
 ################################
 
+####
+# Check to see if char is signed or unsigned.
+####
+
+SET(SIGNED_TEST_SOURCE "\n
+  #include <stdlib.h>\n
+  int main(void) {\n
+    char is_signed = (char) - 1;\n
+    if(is_signed < 0)\n
+      return 0;\n
+    else\n
+      return 1;\n
+}\n")
+
+CHECK_C_SOURCE_RUNS("${SIGNED_TEST_SOURCE}" CHAR_IS_SIGNED)
+MESSAGE(STATUS "Type 'char' is signed: ${CHAR_IS_SIGNED}")
+
 
-#
 # Library include checks
 CHECK_INCLUDE_FILE("math.h"      HAVE_MATH_H)
 CHECK_INCLUDE_FILE("unistd.h"  HAVE_UNISTD_H)

config.h.cmake.in

@@ -209,6 +209,9 @@ are set when opening a binary file on Windows. */
 /* Define if we have filelengthi64. */
 #cmakedefine HAVE_FILE_LENGTH_I64 @HAVE_FILE_LENGTH_I64@
 
+/* Define whether char is signed by default. */
+#cmakedefine CHAR_IS_SIGNED
+
 /* The size of `void*` as computed by sizeof. */
 #cmakedefine SIZEOF_VOIDSTAR @SIZEOF_VOIDSTAR@
 /* The size of `char` as computed by sizeof. */

nc_test/CMakeLists.txt

@@ -14,12 +14,29 @@ SET (nc_test_SRC
   test_write.c
   util.c
   )
+
+SET (nc_test2_SRC
+  nc_test2.c
+  error.c
+  test_get.c
+  test_put.c
+  test_read.c
+  test_write.c
+  util.c
+  )
+
 ADD_EXECUTABLE(nc_test ${nc_test_SRC})
 TARGET_LINK_LIBRARIES(nc_test
   netcdf
   ${HAVE_LIBM}
   )
 
+ADD_EXECUTABLE(nc_test2 ${nc_test2_SRC})
+TARGET_LINK_LIBRARIES(nc_test2
+  netcdf
+  ${HAVE_LIBM}
+  )
+
 # Some extra stand-alone tests
 SET(TESTS t_nc tst_small tst_misc tst_norm tst_names tst_nofill tst_nofill2 tst_nofill3 tst_meta)
 
@@ -66,6 +83,7 @@ FOREACH(CTEST ${TESTS})
 ENDFOREACH()
 
 ADD_TEST(nc_test ${EXECUTABLE_OUTPUT_PATH}/nc_test)
+ADD_TEST(nc_test2 ${EXECUTABLE_OUTPUT_PATH}/nc_test)
 
 IF(BUILD_DISKLESS)
   add_sh_test(nc_test run_diskless)