glsl: Add using statements for standard library functions.

Standard library functions in C++ are in the std namespace. When using
C++-style header files for the standard library, some compilers, such as
Sun Studio, provide symbols only for the std namespace and not for the
global namespace.

This patch adds using statements for standard library functions. Another
option could have been to prepend standard library function calls with
'std::'.

This patch fixes several compilation errors with Sun Studio.

src/glsl/ast_expr.cpp

@@ -24,6 +24,8 @@
 #include <cassert>
 #include "ast.h"
 
+using std::printf;
+
 const char *
 ast_expression::operator_string(enum ast_operators op)
 {

src/glsl/ast_type.cpp

@@ -27,6 +27,8 @@ extern "C" {
 #include "program/symbol_table.h"
 }
 
+using std::printf;
+
 void
 ast_type_specifier::print(void) const
 {

src/glsl/hir_field_selection.cpp

@@ -27,6 +27,8 @@
 #include "ast.h"
 #include "glsl_types.h"
 
+using std::strcmp;
+
 ir_rvalue *
 _mesa_ast_field_selection_to_hir(const ast_expression *expr,
 				 exec_list *instructions,

src/glsl/ir_print_visitor.cpp

@@ -25,6 +25,9 @@
 #include "glsl_types.h"
 #include "glsl_parser_extras.h"
 
+using std::printf;
+using std::strncmp;
+
 static void print_type(const glsl_type *t);
 
 void

src/glsl/ir_validate.cpp

@@ -39,6 +39,9 @@
 #include "program/hash_table.h"
 #include "glsl_types.h"
 
+using std::abort;
+using std::printf;
+
 class ir_validate : public ir_hierarchical_visitor {
 public:
    ir_validate()

src/glsl/lower_mat_op_to_vec.cpp

@@ -35,6 +35,9 @@
 #include "ir_expression_flattening.h"
 #include "glsl_types.h"
 
+using std::abort;
+using std::printf;
+
 class ir_mat_op_to_vec_visitor : public ir_hierarchical_visitor {
 public:
    ir_mat_op_to_vec_visitor()

src/glsl/opt_constant_propagation.cpp

@@ -41,6 +41,8 @@
 #include "ir_optimization.h"
 #include "glsl_types.h"
 
+using std::memset;
+
 class acp_entry : public exec_node
 {
 public:

src/glsl/opt_constant_variable.cpp

@@ -37,6 +37,9 @@
 #include "ir_optimization.h"
 #include "glsl_types.h"
 
+using std::calloc;
+using std::free;
+
 struct assignment_entry {
    exec_node link;
    int assignment_count;

src/glsl/opt_dead_code.cpp

@@ -32,6 +32,8 @@
 #include "ir_variable_refcount.h"
 #include "glsl_types.h"
 
+using std::printf;
+
 static bool debug = false;
 
 /**

src/glsl/opt_dead_code_local.cpp

@@ -38,6 +38,8 @@
 #include "ir_optimization.h"
 #include "glsl_types.h"
 
+using std::printf;
+
 static bool debug = false;
 
 class assignment_entry : public exec_node

src/glsl/opt_dead_functions.cpp

@@ -32,6 +32,8 @@
  #include "ir_expression_flattening.h"
  #include "glsl_types.h"
 
+ using std::strcmp;
+
  class signature_entry : public exec_node
  {
  public:

src/glsl/opt_structure_splitting.cpp

@@ -38,6 +38,9 @@
 #include "ir_rvalue_visitor.h"
 #include "glsl_types.h"
 
+using std::printf;
+using std::strcmp;
+
 static bool debug = false;
 
 // XXX using variable_entry2 here to avoid collision (MSVC multiply-defined

src/glsl/opt_swizzle_swizzle.cpp

@@ -32,6 +32,8 @@
 #include "ir_optimization.h"
 #include "glsl_types.h"
 
+using std::memset;
+
 class ir_swizzle_swizzle_visitor : public ir_hierarchical_visitor {
 public:
    ir_swizzle_swizzle_visitor()

src/glsl/opt_tree_grafting.cpp

@@ -54,6 +54,8 @@
 #include "ir_optimization.h"
 #include "glsl_types.h"
 
+using std::printf;
+
 static bool debug = false;
 
 class ir_tree_grafting_visitor : public ir_hierarchical_visitor {