Converted alignment check to work also when cross compiling.

1 files changed, 22 insertions, 17 deletions

diff --git a/compilers.py b/compilers.py
index 56b2c8a..f457cf3 100644
--- a/compilers.py
+++ b/compilers.py
@@ -361,7 +361,28 @@ int main(int argc, char **argv) {
             raise EnvironmentException('Could not run sizeof test binary.')
         return int(res.stdout)
 
+    def cross_alignment(self, typename, env):
+        templ = '''#include<stddef.h>
+struct tmp {
+  char c;
+  %s target;
+};
+
+int testarray[%d-offsetof(struct tmp, target)];
+'''
+        try:
+            extra_args = env.cross_info.config['properties'][self.language + '_args']
+        except KeyError:
+            pass
+        for i in range(1, 1024):
+            code = templ % (typename, i)
+            if self.compiles(code, extra_args):
+                return i
+        raise EnvironmentException('Cross checking offsetof overflowed.')
+
     def alignment(self, typename, env):
+        if self.is_cross:
+            return self.cross_alignment(typename, env)
         templ = '''#include<stdio.h>
 #include<stddef.h>
 
@@ -375,23 +396,7 @@ int main(int argc, char **argv) {
   return 0;
 }
 '''
-        varname = 'alignment ' + typename
-        varname = varname.replace(' ', '_')
-        if self.is_cross:
-            val = env.cross_info.config['properties'][varname]
-            if val is not None:
-                if isinstance(val, int):
-                    return val
-                raise EnvironmentException('Cross variable {0} is not an integer.'.format(varname))
-        cross_failed = False
-        try:
-            res = self.run(templ % typename)
-        except CrossNoRunException:
-            cross_failed = True
-        if cross_failed:
-            message = '''Can not determine alignment of {0} because cross compiled binaries are not runnable.
-Please define the corresponding variable {1} in your cross compilation definition file.'''.format(typename, varname)
-            raise EnvironmentException(message)
+        res = self.run(templ % typename)
         if not res.compiled:
             raise EnvironmentException('Could not compile alignment test.')
         if res.returncode != 0: