Can detect sizes of expressions.

backends.py

@@ -41,8 +41,10 @@ def do_replacement(regex, line, confdata):
                 pass
             elif isinstance(var, nodes.StringStatement):
                 var = var.get_value()
+            elif isinstance(var, int):
+                var = str(var)
             else:
-                raise RuntimeError('Tried to replace a variable with something other than a string.')
+                raise RuntimeError('Tried to replace a variable with something other than a string or int.')
         else:
             var = ''
         line = line.replace('@' + varname + '@', var)

environment.py

@@ -133,6 +133,35 @@ class CCompiler():
             pass
         return p.returncode == 0
 
+    def sizeof(self, element):
+        templ = '''#include<stdio.h>
+int main(int argc, char **argv) {
+    printf("%%ld\\n", (long)(sizeof(%s)));
+    return 0;
+};
+'''
+        (fd, srcname) = tempfile.mkstemp(suffix='.'+self.default_suffix)
+        exename = srcname + '.exe' # Is guaranteed to be executable on every platform.
+        os.close(fd)
+        ofile = open(srcname, 'w')
+        code = templ % element
+        ofile.write(code)
+        ofile.close()
+        commands = self.get_exelist()
+        commands.append(srcname)
+        commands += self.get_output_flags(exename)
+        p = subprocess.Popen(commands, cwd=os.path.split(srcname)[0])#s, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+        p.communicate()
+        os.remove(srcname)
+        if p.returncode != 0:
+            raise EnvironmentException('Could not compile sizeof test.')
+        pe = subprocess.Popen(exename, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        so = pe.communicate()[0]
+        os.remove(exename)
+        if pe.returncode != 0:
+            raise EnvironmentException('Could not run sizeof test binary.')
+        return int(so.decode())
+
 cxx_suffixes = ['cc', 'cpp', 'cxx', 'hh', 'hpp', 'hxx']
 
 class CXXCompiler(CCompiler):

interpreter.py

@@ -537,11 +537,20 @@ class CompilerHolder(InterpreterObject):
         self.compiler = compiler
         self.methods.update({'compiles': self.compiles_method,
                              'get_id': self.get_id_method,
+                             'sizeof': self.sizeof_method,
                              })
 
     def get_id_method(self, args, kwargs):
         return self.compiler.get_id()
     
+    def sizeof_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Sizeof takes exactly one argument.')
+        string = args[0]
+        if not isinstance(string, str):
+            raise InterpreterException('Argument to sizeof must be a string.')
+        return self.compiler.sizeof(string)
+
     def compiles_method(self, args, kwargs):
         if len(args) != 1:
             raise InterpreterException('compiles method takes exactly one argument.')
@@ -944,6 +953,7 @@ class Interpreter():
             isinstance(value, str) or\
             isinstance(value, nodes.BoolStatement) or\
             isinstance(value, nodes.IntStatement) or\
+            isinstance(value, int) or \
             isinstance(value, list):
             return True
         return False

test cases/common/35 sizeof/config.h.in

@@ -0,0 +1 @@
+#define INTSIZE @INTSIZE@

test cases/common/35 sizeof/meson.build

@@ -0,0 +1,11 @@
+project('sizeof', 'c')
+
+cc = meson.get_compiler('c')
+intsize = cc.sizeof('int')
+
+cd = configuration_data()
+cd.set('INTSIZE', intsize)
+configure_file(input : 'config.h.in', output : 'config.h', configuration : cd)
+
+e = executable('prog', 'prog.c', include_dirs : include_directories('.'))
+add_test('sizeof test', e)

test cases/common/35 sizeof/prog.c

@@ -0,0 +1,10 @@
+#include"config.h"
+#include<stdio.h>
+
+int main(int argc, char **argv) {
+    if(INTSIZE != sizeof(int)) {
+        fprintf(stderr, "Mismatch: detected int size %d, actual size %d.\n", INTSIZE, (int)sizeof(int));
+        return 1;
+    }
+    return 0;
+}