added gcc_versiont

Author: Daniel Kroening

src/goto-cc/Makefile

@@ -8,6 +8,7 @@ SRC = armcc_cmdline.cpp \
       cw_mode.cpp \
       gcc_cmdline.cpp \
       gcc_mode.cpp \
+      gcc_version.cpp \
       goto_cc_cmdline.cpp \
       goto_cc_languages.cpp \
       goto_cc_main.cpp \

src/goto-cc/gcc_version.cpp

@@ -0,0 +1,89 @@
+/*******************************************************************\
+
+Module: GCC Mode
+
+Author: Daniel Kroening, 2018
+
+\*******************************************************************/
+
+#include "gcc_version.h"
+
+#include <util/prefix.h>
+#include <util/run.h>
+#include <util/string2int.h>
+#include <util/string_utils.h>
+#include <util/tempfile.h>
+
+#include <fstream>
+
+void gcc_versiont::get(const std::string &executable)
+{
+  temporary_filet tmp_file_in("goto-gcc.", ".in");
+  temporary_filet tmp_file_out("goto-gcc.", ".out");
+  temporary_filet tmp_file_err("goto-gcc.", ".err");
+
+  {
+    std::ofstream out(tmp_file_in());
+
+    out << "#if defined(__clang_major__)\n"
+           "clang __clang_major__ __clang_minor__ __clang_patchlevel__\n"
+           "#elif defined(__BCC__)\n"
+           "bcc 0 0 0\n"
+           "#else\n"
+           "gcc __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__\n"
+           "#endif\n";
+  }
+
+  // some variants output stuff on stderr, say Apple LLVM,
+  // which we silence.
+  int result = run(
+    executable,
+    {executable, "-E", "-", "-o", "-"},
+    tmp_file_in(),
+    tmp_file_out(),
+    tmp_file_err());
+
+  v_major = v_minor = v_patchlevel = 0;
+  flavor = flavort::UNKNOWN;
+
+  if(result >= 0)
+  {
+    std::ifstream in(tmp_file_out());
+    std::string line;
+
+    while(!in.fail() && std::getline(in, line))
+      if(!line.empty() && line[0] != '#')
+        break;
+
+    auto split = split_string(line, ' ');
+
+    if(split.size() >= 4)
+    {
+      if(split[0] == "gcc")
+        flavor = flavort::GCC;
+      else if(split[0] == "bcc")
+        flavor = flavort::BCC;
+      else if(split[0] == "clang")
+        flavor = flavort::CLANG;
+
+      v_major = unsafe_string2unsigned(split[1]);
+      v_minor = unsafe_string2unsigned(split[2]);
+      v_patchlevel = unsafe_string2unsigned(split[3]);
+    }
+  }
+}
+
+bool gcc_versiont::is_at_least(
+  unsigned _major,
+  unsigned _minor,
+  unsigned _patchlevel) const
+{
+  return v_major > _major || (v_major == _major && v_minor > _minor) ||
+         (v_major == _major && v_minor == _minor &&
+          v_patchlevel >= _patchlevel);
+}
+
+std::ostream &operator<<(std::ostream &out, const gcc_versiont &v)
+{
+  return out << v.v_major << '.' << v.v_minor << '.' << v.v_patchlevel;
+}

src/goto-cc/gcc_version.h

@@ -0,0 +1,45 @@
+/*******************************************************************\
+
+Module: gcc version numbering scheme
+
+Author: Daniel Kroening
+
+Date: May 2018
+
+\*******************************************************************/
+
+#ifndef CPROVER_GOTO_CC_GCC_VERSION_H
+#define CPROVER_GOTO_CC_GCC_VERSION_H
+
+#include <iosfwd>
+#include <string>
+
+class gcc_versiont
+{
+public:
+  unsigned v_major, v_minor, v_patchlevel;
+
+  void get(const std::string &executable);
+
+  bool is_at_least(
+    unsigned v_major,
+    unsigned v_minor = 0,
+    unsigned v_patchlevel = 0) const;
+
+  enum class flavort
+  {
+    UNKNOWN,
+    CLANG,
+    GCC,
+    BCC
+  } flavor;
+
+  gcc_versiont()
+    : v_major(0), v_minor(0), v_patchlevel(0), flavor(flavort::UNKNOWN)
+  {
+  }
+};
+
+std::ostream &operator<<(std::ostream &, const gcc_versiont &);
+
+#endif