maint: improve handling installation issues

README.md

@@ -17,6 +17,11 @@ method proposed by [Feng & Palomar (2015)](https://doi.org/10.1109/TSP.2015.2452
 
 **R version:** [**https://mirca.github.io/riskParityPortfolio**](https://mirca.github.io/riskParityPortfolio)
 
+## Installation
+
+``pip install riskparityportfolio``
+
+
 ## License
 
 Copyright 2019 Ze Vinicius and Daniel Palomar

setup.py

@@ -4,7 +4,7 @@
 import setuptools
 import os
 
-__version__ = '0.1.0dev'
+__version__ = '0.1.1'
 
 # Prepare and send a new release to PyPI
 if "release" in sys.argv[-1]:
@@ -61,33 +61,36 @@ def has_flag(compiler, flagname):
 
 
 def cpp_flag(compiler):
-    """Return the -std=c++[11/14] compiler flag.
-
-    The c++14 is prefered over c++11 (when it is available).
+    """Return the -std=c++[11/14/17] compiler flag.
+    The newer version is prefered over c++11 (when it is available).
     """
-    if has_flag(compiler, '-std=c++14'):
-        return '-std=c++14'
-    elif has_flag(compiler, '-std=c++11'):
-        return '-std=c++11'
-    else:
-        raise RuntimeError('Unsupported compiler -- at least C++11 support '
-                           'is needed!')
+    flags = ['-std=c++17', '-std=c++14', '-std=c++11']
+
+    for flag in flags:
+        if has_flag(compiler, flag): return flag
 
+    raise RuntimeError('Unsupported compiler -- at least C++11 support '
+                       'is needed!')
 
 class BuildExt(build_ext):
     """A custom build extension for adding compiler-specific options."""
     c_opts = {
         'msvc': ['/EHsc'],
         'unix': [],
     }
-
+    l_opts = {
+        'msvc': [],
+        'unix': [],
+    }
     if sys.platform == 'darwin':
-        c_opts['unix'] += ['-stdlib=libc++', '-mmacosx-version-min=10.7']
+        darwin_opts = ['-stdlib=libc++', '-mmacosx-version-min=10.7']
+        c_opts['unix'] += darwin_opts
+        l_opts['unix'] += darwin_opts
 
     def build_extensions(self):
-        # compiler flags
         ct = self.compiler.compiler_type
         opts = self.c_opts.get(ct, [])
+        link_opts = self.l_opts.get(ct, [])
         if ct == 'unix':
             opts.append('-DVERSION_INFO="%s"' % self.distribution.get_version())
             opts.append(cpp_flag(self.compiler))
@@ -97,6 +100,7 @@ def build_extensions(self):
             opts.append('/DVERSION_INFO=\\"%s\\"' % self.distribution.get_version())
         for ext in self.extensions:
             ext.extra_compile_args = opts
+            ext.extra_link_args = link_opts
         # third-party libraries flags
         localincl = "third-party"
         if not os.path.exists(os.path.join(localincl, "eigen_3.3.7", "Eigen",