From a6d965d846dd989bfd9bcfa806575cadf5643656 Mon Sep 17 00:00:00 2001
From: Mike Gilbert <floppym@gentoo.org>
Date: Fri, 5 Jan 2018 13:34:21 -0500
Subject: [PATCH 05/14] Improve distutils C++ support

https://bugs.python.org/issue1222585
---
 Lib/_osx_support.py                   |  6 +--
 Lib/distutils/cygwinccompiler.py      | 21 ++++++++--
 Lib/distutils/sysconfig.py            | 25 ++++++++---
 Lib/distutils/tests/test_sysconfig.py | 16 +++----
 Lib/distutils/unixccompiler.py        | 60 +++++++++++++--------------
 Makefile.pre.in                       |  4 +-
 6 files changed, 80 insertions(+), 52 deletions(-)

diff --git a/Lib/_osx_support.py b/Lib/_osx_support.py
index 37975fe8a3..b4e46df29c 100644
--- a/Lib/_osx_support.py
+++ b/Lib/_osx_support.py
@@ -14,13 +14,13 @@ __all__ = [
 # configuration variables that may contain universal build flags,
 # like "-arch" or "-isdkroot", that may need customization for
 # the user environment
-_UNIVERSAL_CONFIG_VARS = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS', 'BASECFLAGS',
-                            'BLDSHARED', 'LDSHARED', 'CC', 'CXX',
+_UNIVERSAL_CONFIG_VARS = ('CFLAGS', 'CXXFLAGS', 'LDFLAGS', 'CPPFLAGS', 'BASECFLAGS',
+                            'BLDSHARED', 'LDSHARED', 'LDCXXSHARED', 'CC', 'CXX',
                             'PY_CFLAGS', 'PY_LDFLAGS', 'PY_CPPFLAGS',
                             'PY_CORE_CFLAGS', 'PY_CORE_LDFLAGS')
 
 # configuration variables that may contain compiler calls
-_COMPILER_CONFIG_VARS = ('BLDSHARED', 'LDSHARED', 'CC', 'CXX')
+_COMPILER_CONFIG_VARS = ('BLDSHARED', 'LDSHARED', 'LDCXXSHARED', 'CC', 'CXX')
 
 # prefix added to original configuration variable names
 _INITPRE = '_OSX_SUPPORT_INITIAL_'
diff --git a/Lib/distutils/cygwinccompiler.py b/Lib/distutils/cygwinccompiler.py
index 66c12dd358..dddb9fd2d4 100644
--- a/Lib/distutils/cygwinccompiler.py
+++ b/Lib/distutils/cygwinccompiler.py
@@ -123,8 +123,10 @@ class CygwinCCompiler(UnixCCompiler):
         # dllwrap 2.10.90 is buggy
         if self.ld_version >= "2.10.90":
             self.linker_dll = "gcc"
+            self.linker_dll_cxx = "g++"
         else:
             self.linker_dll = "dllwrap"
+            self.linker_dll_cxx = "dllwrap"
 
         # ld_version >= "2.13" support -shared so use it instead of
         # -mdll -static
@@ -138,9 +140,13 @@ class CygwinCCompiler(UnixCCompiler):
         self.set_executables(compiler='gcc -mcygwin -O -Wall',
                              compiler_so='gcc -mcygwin -mdll -O -Wall',
                              compiler_cxx='g++ -mcygwin -O -Wall',
+                             compiler_so_cxx='g++ -mcygwin -mdll -O -Wall',
                              linker_exe='gcc -mcygwin',
                              linker_so=('%s -mcygwin %s' %
-                                        (self.linker_dll, shared_option)))
+                                        (self.linker_dll, shared_option)),
+                             linker_exe_cxx='g++ -mcygwin',
+                             linker_so_cxx=('%s -mcygwin %s' %
+                                            (self.linker_dll_cxx, shared_option)))
 
         # cygwin and mingw32 need different sets of libraries
         if self.gcc_version == "2.91.57":
@@ -164,8 +170,12 @@ class CygwinCCompiler(UnixCCompiler):
                 raise CompileError(msg)
         else: # for other files use the C-compiler
             try:
-                self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
-                           extra_postargs)
+                if self.detect_language(src) == 'c++':
+                    self.spawn(self.compiler_so_cxx + cc_args + [src, '-o', obj] +
+                               extra_postargs)
+                else:
+                    self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
+                               extra_postargs)
             except DistutilsExecError as msg:
                 raise CompileError(msg)
 
@@ -300,9 +310,14 @@ class Mingw32CCompiler(CygwinCCompiler):
         self.set_executables(compiler='gcc -O -Wall',
                              compiler_so='gcc -mdll -O -Wall',
                              compiler_cxx='g++ -O -Wall',
+                             compiler_so_cxx='g++ -mdll -O -Wall',
                              linker_exe='gcc',
                              linker_so='%s %s %s'
                                         % (self.linker_dll, shared_option,
+                                           entry_point),
+                             linker_exe_cxx='g++',
+                             linker_so_cxx='%s %s %s'
+                                        % (self.linker_dll_cxx, shared_option,
                                            entry_point))
         # Maybe we should also append -mthreads, but then the finished
         # dlls need another dll (mingwm10.dll see Mingw32 docs)
diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
index 37feae5df7..f78d01257a 100644
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -193,9 +193,12 @@ def customize_compiler(compiler):
                 _osx_support.customize_compiler(_config_vars)
                 _config_vars['CUSTOMIZED_OSX_COMPILER'] = 'True'
 
-        (cc, cxx, cflags, ccshared, ldshared, shlib_suffix, ar, ar_flags) = \
-            get_config_vars('CC', 'CXX', 'CFLAGS',
-                            'CCSHARED', 'LDSHARED', 'SHLIB_SUFFIX', 'AR', 'ARFLAGS')
+        (cc, cxx, ccshared, ldshared, ldcxxshared, shlib_suffix, ar, ar_flags) = \
+            get_config_vars('CC', 'CXX', 'CCSHARED', 'LDSHARED', 'LDCXXSHARED',
+                            'SHLIB_SUFFIX', 'AR', 'ARFLAGS')
+
+        cflags = ''
+        cxxflags = ''
 
         if 'CC' in os.environ:
             newcc = os.environ['CC']
@@ -210,19 +213,27 @@ def customize_compiler(compiler):
             cxx = os.environ['CXX']
         if 'LDSHARED' in os.environ:
             ldshared = os.environ['LDSHARED']
+        if 'LDCXXSHARED' in os.environ:
+            ldcxxshared = os.environ['LDCXXSHARED']
         if 'CPP' in os.environ:
             cpp = os.environ['CPP']
         else:
             cpp = cc + " -E"           # not always
         if 'LDFLAGS' in os.environ:
             ldshared = ldshared + ' ' + os.environ['LDFLAGS']
+            ldcxxshared = ldcxxshared + ' ' + os.environ['LDFLAGS']
         if 'CFLAGS' in os.environ:
-            cflags = cflags + ' ' + os.environ['CFLAGS']
+            cflags = os.environ['CFLAGS']
             ldshared = ldshared + ' ' + os.environ['CFLAGS']
+        if 'CXXFLAGS' in os.environ:
+            cxxflags = os.environ['CXXFLAGS']
+            ldcxxshared = ldcxxshared + ' ' + os.environ['CXXFLAGS']
         if 'CPPFLAGS' in os.environ:
             cpp = cpp + ' ' + os.environ['CPPFLAGS']
             cflags = cflags + ' ' + os.environ['CPPFLAGS']
+            cxxflags = cxxflags + ' ' + os.environ['CPPFLAGS']
             ldshared = ldshared + ' ' + os.environ['CPPFLAGS']
+            ldcxxshared = ldcxxshared + ' ' + os.environ['CPPFLAGS']
         if 'AR' in os.environ:
             ar = os.environ['AR']
         if 'ARFLAGS' in os.environ:
@@ -231,13 +242,17 @@ def customize_compiler(compiler):
             archiver = ar + ' ' + ar_flags
 
         cc_cmd = cc + ' ' + cflags
+        cxx_cmd = cxx + ' ' + cxxflags
         compiler.set_executables(
             preprocessor=cpp,
             compiler=cc_cmd,
             compiler_so=cc_cmd + ' ' + ccshared,
-            compiler_cxx=cxx,
+            compiler_cxx=cxx_cmd,
+            compiler_so_cxx=cxx_cmd + ' ' + ccshared,
             linker_so=ldshared,
             linker_exe=cc,
+            linker_so_cxx=ldcxxshared,
+            linker_exe_cxx=cxx,
             archiver=archiver)
 
         compiler.shared_lib_extension = shlib_suffix
diff --git a/Lib/distutils/tests/test_sysconfig.py b/Lib/distutils/tests/test_sysconfig.py
index 236755d095..1388728963 100644
--- a/Lib/distutils/tests/test_sysconfig.py
+++ b/Lib/distutils/tests/test_sysconfig.py
@@ -114,12 +114,13 @@ class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
         os.environ['AR'] = 'env_ar'
         os.environ['CC'] = 'env_cc'
         os.environ['CPP'] = 'env_cpp'
-        os.environ['CXX'] = 'env_cxx --env-cxx-flags'
+        os.environ['CXX'] = 'env_cxx'
         os.environ['LDSHARED'] = 'env_ldshared'
         os.environ['LDFLAGS'] = '--env-ldflags'
         os.environ['ARFLAGS'] = '--env-arflags'
         os.environ['CFLAGS'] = '--env-cflags'
         os.environ['CPPFLAGS'] = '--env-cppflags'
+        os.environ['CXXFLAGS'] = '--env-cxxflags'
 
         comp = self.customize_compiler()
         self.assertEqual(comp.exes['archiver'],
@@ -127,12 +128,12 @@ class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
         self.assertEqual(comp.exes['preprocessor'],
                          'env_cpp --env-cppflags')
         self.assertEqual(comp.exes['compiler'],
-                         'env_cc --sc-cflags --env-cflags --env-cppflags')
+                         'env_cc --env-cflags --env-cppflags')
         self.assertEqual(comp.exes['compiler_so'],
-                         ('env_cc --sc-cflags '
+                         ('env_cc '
                           '--env-cflags ''--env-cppflags --sc-ccshared'))
         self.assertEqual(comp.exes['compiler_cxx'],
-                         'env_cxx --env-cxx-flags')
+                         'env_cxx --env-cxxflags --env-cppflags')
         self.assertEqual(comp.exes['linker_exe'],
                          'env_cc')
         self.assertEqual(comp.exes['linker_so'],
@@ -149,6 +150,7 @@ class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
         del os.environ['ARFLAGS']
         del os.environ['CFLAGS']
         del os.environ['CPPFLAGS']
+        del os.environ['CXXFLAGS']
 
         comp = self.customize_compiler()
         self.assertEqual(comp.exes['archiver'],
@@ -156,11 +158,11 @@ class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
         self.assertEqual(comp.exes['preprocessor'],
                          'sc_cc -E')
         self.assertEqual(comp.exes['compiler'],
-                         'sc_cc --sc-cflags')
+                         'sc_cc ')
         self.assertEqual(comp.exes['compiler_so'],
-                         'sc_cc --sc-cflags --sc-ccshared')
+                         'sc_cc  --sc-ccshared')
         self.assertEqual(comp.exes['compiler_cxx'],
-                         'sc_cxx')
+                         'sc_cxx ')
         self.assertEqual(comp.exes['linker_exe'],
                          'sc_cc')
         self.assertEqual(comp.exes['linker_so'],
diff --git a/Lib/distutils/unixccompiler.py b/Lib/distutils/unixccompiler.py
index f0792de74a..16e7fbea83 100644
--- a/Lib/distutils/unixccompiler.py
+++ b/Lib/distutils/unixccompiler.py
@@ -52,14 +52,17 @@ class UnixCCompiler(CCompiler):
     # are pretty generic; they will probably have to be set by an outsider
     # (eg. using information discovered by the sysconfig about building
     # Python extensions).
-    executables = {'preprocessor' : None,
-                   'compiler'     : ["cc"],
-                   'compiler_so'  : ["cc"],
-                   'compiler_cxx' : ["cc"],
-                   'linker_so'    : ["cc", "-shared"],
-                   'linker_exe'   : ["cc"],
-                   'archiver'     : ["ar", "-cr"],
-                   'ranlib'       : None,
+    executables = {'preprocessor'    : None,
+                   'compiler'        : ["cc"],
+                   'compiler_so'     : ["cc"],
+                   'compiler_cxx'    : ["c++"],
+                   'compiler_so_cxx' : ["c++"],
+                   'linker_so'       : ["cc", "-shared"],
+                   'linker_exe'      : ["cc"],
+                   'linker_so_cxx'   : ["c++", "-shared"],
+                   'linker_exe_cxx'  : ["c++"],
+                   'archiver'        : ["ar", "-cr"],
+                   'ranlib'          : None,
                   }
 
     if sys.platform[:6] == "darwin":
@@ -110,12 +113,19 @@ class UnixCCompiler(CCompiler):
 
     def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
         compiler_so = self.compiler_so
+        compiler_so_cxx = self.compiler_so_cxx
         if sys.platform == 'darwin':
             compiler_so = _osx_support.compiler_fixup(compiler_so,
                                                     cc_args + extra_postargs)
+            compiler_so_cxx = _osx_support.compiler_fixup(compiler_so_cxx,
+                                                    cc_args + extra_postargs)
         try:
-            self.spawn(compiler_so + cc_args + [src, '-o', obj] +
-                       extra_postargs)
+            if self.detect_language(src) == 'c++':
+                self.spawn(compiler_so_cxx + cc_args + [src, '-o', obj] +
+                           extra_postargs)
+            else:
+                self.spawn(compiler_so + cc_args + [src, '-o', obj] +
+                           extra_postargs)
         except DistutilsExecError as msg:
             raise CompileError(msg)
 
@@ -173,30 +183,16 @@ class UnixCCompiler(CCompiler):
                 ld_args.extend(extra_postargs)
             self.mkpath(os.path.dirname(output_filename))
             try:
-                if target_desc == CCompiler.EXECUTABLE:
-                    linker = self.linker_exe[:]
+                if target_lang == "c++":
+                    if target_desc == CCompiler.EXECUTABLE:
+                        linker = self.linker_exe_cxx[:]
+                    else:
+                        linker = self.linker_so_cxx[:]
                 else:
-                    linker = self.linker_so[:]
-                if target_lang == "c++" and self.compiler_cxx:
-                    # skip over environment variable settings if /usr/bin/env
-                    # is used to set up the linker's environment.
-                    # This is needed on OSX. Note: this assumes that the
-                    # normal and C++ compiler have the same environment
-                    # settings.
-                    i = 0
-                    if os.path.basename(linker[0]) == "env":
-                        i = 1
-                        while '=' in linker[i]:
-                            i += 1
-
-                    if os.path.basename(linker[i]) == 'ld_so_aix':
-                        # AIX platforms prefix the compiler with the ld_so_aix
-                        # script, so we need to adjust our linker index
-                        offset = 1
+                    if target_desc == CCompiler.EXECUTABLE:
+                        linker = self.linker_exe[:]
                     else:
-                        offset = 0
-
-                    linker[i+offset] = self.compiler_cxx[i]
+                        linker = self.linker_so[:]
 
                 if sys.platform == 'darwin':
                     linker = _osx_support.compiler_fixup(linker, ld_args)
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 27666e9d16..abdb4a096f 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -630,10 +630,10 @@ sharedmods: $(BUILDPYTHON) pybuilddir.txt Modules/_math.o
 	    *\ -s*|s*) quiet="-q";; \
 	    *) quiet="";; \
 	esac; \
-	echo "$(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' \
+	echo "$(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' CFLAGS='$(PY_CFLAGS)' \
 		_TCLTK_INCLUDES='$(TCLTK_INCLUDES)' _TCLTK_LIBS='$(TCLTK_LIBS)' \
 		$(PYTHON_FOR_BUILD) $(srcdir)/setup.py $$quiet build"; \
-	$(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' \
+	$(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' CFLAGS='$(PY_CFLAGS)' \
 		_TCLTK_INCLUDES='$(TCLTK_INCLUDES)' _TCLTK_LIBS='$(TCLTK_LIBS)' \
 		$(PYTHON_FOR_BUILD) $(srcdir)/setup.py $$quiet build
 
-- 
2.33.0

