Issue #26: Detect empty array constructors, require at least on operand.

Test/array.frag

@@ -100,3 +100,5 @@ void foo3()
     resize2.length();
     resize2[5] = 4.0;  // ERROR
 }
+
+int[] i = int[](); // ERROR, need constructor arguments

Test/baseResults/array.frag.out

@@ -22,7 +22,9 @@ ERROR: 0:79: '' : array size required
 ERROR: 0:84: 'return' : type does not match, or is not convertible to, the function's return type 
 ERROR: 0:93: 'length' :  array must be declared with a size before using this method
 ERROR: 0:101: '[' :  array index out of range '5'
-ERROR: 23 compilation errors.  No code generated.
+ERROR: 0:104: 'constructor' : array constructor must have at least one argument 
+ERROR: 0:104: '=' :  cannot convert from 'const float' to 'global implicitly-sized array of int'
+ERROR: 25 compilation errors.  No code generated.
 
 
 Shader version: 130
@@ -264,6 +266,7 @@ ERROR: node is still EOpNull!
 0:?     'guns' (global implicitly-sized array of 3-component vector of float)
 0:?     'f' (global float)
 0:?     'gUnusedUnsized' (global implicitly-sized array of float)
+0:?     'i' (global implicitly-sized array of int)
 
 
 Linked fragment stage:
@@ -508,4 +511,5 @@ ERROR: node is still EOpNull!
 0:?     'guns' (global 8-element array of 3-component vector of float)
 0:?     'f' (global float)
 0:?     'gUnusedUnsized' (global 1-element array of float)
+0:?     'i' (global 1-element array of int)
 

glslang/MachineIndependent/ParseHelper.cpp

@@ -1973,6 +1973,10 @@ bool TParseContext::constructorError(TSourceLoc loc, TIntermNode* node, TFunctio
         type.getQualifier().storage = EvqConst;
 
     if (type.isArray()) {
+        if (function.getParamCount() == 0) {
+            error(loc, "array constructor must have at least one argument", "constructor", "");
+            return true;
+        }
         if (type.isImplicitlySizedArray()) {
             // auto adapt the constructor type to the number of arguments
             type.changeArraySize(function.getParamCount());
@@ -1992,7 +1996,7 @@ bool TParseContext::constructorError(TSourceLoc loc, TIntermNode* node, TFunctio
 
         // "If a matrix argument is given to a matrix constructor,
         // it is a compile-time error to have any other arguments."
-        if (function.getParamCount() > 1)
+        if (function.getParamCount() != 1)
             error(loc, "matrix constructed from matrix can only have one argument", "constructor", "");
         return false;
     }