Readd _cling_config

Author: sudo-panda

python/cppyy_backend/_cling_config.py

@@ -0,0 +1,100 @@
+from __future__ import print_function
+import os, sys, subprocess
+
+MYHOME = os.path.dirname(__file__)
+
+def main():
+    if len(sys.argv) == 2:
+        options = sys.argv[1]
+
+        if options == '--cmake':
+            print(os.path.join(MYHOME, "cmake"))
+            return 0
+
+        if options == '--cppflags':
+            options = '--cflags'
+
+        if options != '--help':
+            rcfg = os.path.join(MYHOME, 'bin', 'root-config')
+            try:
+                cli_arg = subprocess.check_output(
+                    [os.path.join(MYHOME, 'bin', 'root-config'), options],
+                    stderr=subprocess.STDOUT)
+                out = cli_arg.decode("utf-8").strip()
+                if 'flags' in options and 'STDCXX' in os.environ and '-std=' in out:
+                    req = os.environ['STDCXX']
+                    true_flags = None
+                    if req == '17':
+                        true_flags = '-std=c++1z'
+                    elif req == '20':
+                        true_flags = '-std=c++2a'
+                    else:
+                        true_flags = '-std=c++'+req
+                    if true_flags:
+                        pos = out.find('std=')
+                        out = out[:pos] + true_flags + out[pos+9:]
+                print(out)
+                return 0
+            except OSError:
+                if not os.path.exists(rcfg) or not 'win32' in sys.platform:
+                    raise
+
+                # happens on Windows b/c root-config is a bash script; the
+                # following covers the most important options until that
+                # gets fixed upstream
+
+                def get_include_dir():
+                    return os.path.join(MYHOME, 'include')
+
+                def get_library_dir():
+                    return os.path.join(MYHOME, 'lib')
+
+                def get_basic_cppflags():
+                    flags = '-Zc:__cplusplus '
+                    if 'STDCXX' in os.environ:
+                        return flags + '/std:c++'+os.environ['STDCXX']
+                    else:
+                        for line in open(rcfg):
+                            if 'cxxversion' in line:
+                                if '11' in line:
+                                    return flags+'/std:c++11'
+                                elif '14' in line:
+                                    return flags+'/std:c++14'
+                                elif '17' in line:
+                                    return flags+'/std:c++17'
+                                else:
+                                  # includes C++20, which won't get it's own flag until
+                                  # it is feature-complete
+                                    return flags+'/std:c++latest'
+                        raise
+
+                if options == '--incdir':
+                    print(get_include_dir())
+                    return 0
+
+                elif options == '--libdir':
+                    print(get_library_dir())
+                    return 0
+
+                elif options == '--auxcflags':
+                # most important is get the C++ version flag right
+                    print(get_basic_cppflags())
+                    return 0
+
+                elif options == '--cflags':
+                # most important are C++ flag and include directory
+                    print(get_basic_cppflags(), '/I'+get_include_dir(), '/FIw32pragma.h')
+                    return 0
+
+                elif options == '--ldflags':
+                    print('/LIBPATH:'+get_library_dir(), 'libCoreLegacy.lib', 'libRIOLegacy.lib')
+                    return 0
+
+            except subprocess.CalledProcessError:
+                pass
+
+    print('Usage: cling-config [--cflags] [--cppflags] [--cmake]')
+    return 1
+
+if __name__ == '__main__':
+    sys.exit(main())