sqlite3.m4: Fix cross compilation

sqlite3 version check uses AC_RUN_IFELSE without a cross compilation
argument, which makes cross builds from source fail.

Thanks to Helmut Grohne for the bug report on the Debian Bug Tracking
System (bug 1119126).

We now use AC_COMPUTE_INT as this macro works for cross builds, and
check the version against SQLITE_VERSION_NUMBER.

Author: Julien-Elie

m4/sqlite3.m4

@@ -46,25 +46,22 @@ dnl Restore CPPFLAGS, LDFLAGS, and LIBS to their previous values before
 dnl INN_LIB_SQLITE3_SWITCH was called.
 AC_DEFUN([INN_LIB_SQLITE3_RESTORE], [INN_LIB_HELPER_RESTORE([SQLITE3])])
 
-dnl Ensures SQLite v3 meets our minimum version requirement.
-AC_DEFUN([_INN_LIB_SQLITE3_SOURCE], [[
-#include <sqlite3.h>
-
-int main(void) {
-    return sqlite3_libversion_number() < 3008002;
-}
-]])
-
-dnl Checks if SQLite v3 is present.  The single argument, if "true", says to
-dnl fail if the SQLite library could not be found.
+dnl Checks if SQLite v3 is present. The single argument, if "true", says to
+dnl fail if the SQLite library could not be found. We do not use pkg-config
+dnl like the upstream version of this file as we have a specific check to
+dnl ensure that SQLite v3 meets our minimum version requirement.
 AC_DEFUN([_INN_LIB_SQLITE3_INTERNAL],
 [AC_CACHE_CHECK([for a sufficiently recent SQLite],
     [inn_cv_have_sqlite3],
     [INN_LIB_HELPER_PATHS([SQLITE3])
      INN_LIB_SQLITE3_SWITCH
      LIBS="-lsqlite3 $LIBS"
-     AC_RUN_IFELSE([AC_LANG_SOURCE([_INN_LIB_SQLITE3_SOURCE])],
-        [inn_cv_have_sqlite3=yes],
+     AC_COMPUTE_INT([_INN_LIB_SQLITE3_VERSION], [SQLITE_VERSION_NUMBER],
+        [#include <sqlite3.h>])
+     AS_IF([test "x$_INN_LIB_SQLITE3_VERSION" != x],
+        [AS_IF([test "$_INN_LIB_SQLITE3_VERSION" -ge 3008002],
+            [inn_cv_have_sqlite3=yes],
+            [inn_cv_have_sqlite3=no])],
         [inn_cv_have_sqlite3=no])
      INN_LIB_SQLITE3_RESTORE])
  AS_IF([test x"$inn_cv_have_sqlite3" = xyes],

support/getrra-c-util

@@ -62,25 +62,22 @@ download() {
                 sed -i -e '$d' ${TEMP}
             elif [ "$3" = "sqlite3.m4" ]; then
                 sed -i -e '49 i \
-dnl Ensures SQLite v3 meets our minimum version requirement.\
-AC_DEFUN([_INN_LIB_SQLITE3_SOURCE], [[\
-#include <sqlite3.h>\
-\
-int main(void) {\
-    return sqlite3_libversion_number() < 3008002;\
-}\
-]])\
-\
-dnl Checks if SQLite v3 is present.  The single argument, if "true", says to\
-dnl fail if the SQLite library could not be found.\
+dnl Checks if SQLite v3 is present. The single argument, if "true", says to\
+dnl fail if the SQLite library could not be found. We do not use pkg-config\
+dnl like the upstream version of this file as we have a specific check to\
+dnl ensure that SQLite v3 meets our minimum version requirement.\
 AC_DEFUN([_INN_LIB_SQLITE3_INTERNAL],\
 [AC_CACHE_CHECK([for a sufficiently recent SQLite],\
     [inn_cv_have_sqlite3],\
     [INN_LIB_HELPER_PATHS([SQLITE3])\
      INN_LIB_SQLITE3_SWITCH\
      LIBS="-lsqlite3 $LIBS"\
-     AC_RUN_IFELSE([AC_LANG_SOURCE([_INN_LIB_SQLITE3_SOURCE])],\
-        [inn_cv_have_sqlite3=yes],\
+     AC_COMPUTE_INT([_INN_LIB_SQLITE3_VERSION], [SQLITE_VERSION_NUMBER],\
+        [#include <sqlite3.h>])\
+     AS_IF([test "x$_INN_LIB_SQLITE3_VERSION" != x],\
+        [AS_IF([test "$_INN_LIB_SQLITE3_VERSION" -ge 3008002],\
+            [inn_cv_have_sqlite3=yes],\
+            [inn_cv_have_sqlite3=no])],\
         [inn_cv_have_sqlite3=no])\
      INN_LIB_SQLITE3_RESTORE])\
  AS_IF([test x"$inn_cv_have_sqlite3" = xyes],\