[tools] Check C & C++ syntax.

BUGS

@@ -7,6 +7,7 @@ Current
 - If a job is paused for longer than the timeout period, sometimes it has
   the timed out status when un-paused.
 - Tmp files are being left behind after shutdown.
+- gcc is not working inside the sandbox.
 
 
 Current (tool related)

README.md

@@ -32,9 +32,9 @@ Extensions | Tools
 .pl .pm .t | [perl_syntax](https://en.wikipedia.org/wiki/Perl) • [perldoc](http://perldoc.perl.org/) • [perltidy](http://perltidy.sourceforge.net/)
 .pod .pod6 | [perldoc](http://perldoc.perl.org/)
 .java | [uncrustify](http://uncrustify.sourceforge.net/)
-.c .h | [splint](http://www.splint.org/) • [uncrustify](http://uncrustify.sourceforge.net/)
+.c .h | [c_syntax](https://gcc.gnu.org/) • [splint](http://www.splint.org/) • [uncrustify](http://uncrustify.sourceforge.net/)
 .o | [objdump_headers](https://en.wikipedia.org/wiki/Objdump) • [objdump_disassemble](https://en.wikipedia.org/wiki/Objdump) • [readelf](https://en.wikipedia.org/wiki/Objdump)
-.cpp | bcpp • [uncrustify](http://uncrustify.sourceforge.net/)
+.cpp | [cpp_syntax](https://gcc.gnu.org/) • bcpp • [uncrustify](http://uncrustify.sourceforge.net/)
 .pdf | [pdf2txt](http://www.unixuser.org/~euske/python/pdfminer/)
 .html | [html_syntax](http://www.html-tidy.org/) • [tidy](http://www.html-tidy.org/) • [html2text](http://www.mbayer.de/html2text/)
 .php | [php5_syntax](https://en.wikipedia.org/wiki/PHP)

tools.py

@@ -509,6 +509,12 @@ perltidy.url = "http://perltidy.sourceforge.net/"
 # perl6_syntax.dependencies = {"rakudo"}
 
 
+def c_syntax(path):
+    return _run_command(["gcc", "-fsyntax-only", path])
+c_syntax.dependencies = {"gcc"}
+c_syntax.url = "https://gcc.gnu.org/"
+
+
 def splint(path):
     stdout, stderr, returncode = _do_command(["splint", "-preproc", path])
     status = Status.ok if returncode == 0 else Status.problem
@@ -595,6 +601,12 @@ html2text.dependencies = {"html2text"}
 html2text.url = "html2text"
 
 
+def cpp_syntax(path):
+    return _run_command(["gcc", "-fsyntax-only", path])
+cpp_syntax.dependencies = {"gcc"}
+cpp_syntax.url = "https://gcc.gnu.org/"
+
+
 def bcpp(path):
     stdout, stderr, returncode = _do_command(["bcpp", "-fi", path])
     status = Status.normal if returncode == 0 else Status.problem
@@ -754,9 +766,9 @@ TOOLS_FOR_EXTENSIONS = \
         # (["p6", "pm6"], [perl6_syntax, perldoc]),
         (["pod", "pod6"], [perldoc]),
         (["java"], [uncrustify]),
-        (["c", "h"], [splint, uncrustify]),
+        (["c", "h"], [c_syntax, splint, uncrustify]),
         (["o"], [objdump_headers, objdump_disassemble, readelf]),
-        (["cpp"], [bcpp, uncrustify]),
+        (["cpp"], [cpp_syntax, bcpp, uncrustify]),
         (["pdf"], [pdf2txt]),
         (["html"], [html_syntax, tidy, html2text]),
         (["php"], [php5_syntax]),

tools_test.py

@@ -153,6 +153,9 @@ class ToolsTestCase(unittest.TestCase):
                          ("hello.h", tools.Status.normal),
                          ("hello.cpp", tools.Status.normal)])
 
+    def test_c_syntax(self):
+        self._test_tool(tools.c_syntax, [("hello.c", tools.Status.ok)])
+
     def test_splint(self):
         self._test_tool(tools.splint, [("hello.c", tools.Status.ok),
                                        ("hello.h", tools.Status.ok)])
@@ -194,6 +197,9 @@ class ToolsTestCase(unittest.TestCase):
     def test_html2text(self):
         self._test_tool(tools.html2text, [("hi.html", tools.Status.normal)])
 
+    def test_cpp_syntax(self):
+        self._test_tool(tools.cpp_syntax, [("hello.cpp", tools.Status.ok)])
+
     def test_bcpp(self):
         self._test_tool(tools.bcpp, [("hello.cpp", tools.Status.normal)])