@@ -111,31 +111,27 @@ def add_optimization_flags(self):
111111enable_lto = setupext .config .getboolean ('libs' ,'enable_lto' ,
112112fallback = None )
113113
114- if 'CFLAGS' in os .environ :
115- if '-fno-lto' in os .environ ['CFLAGS' ]:
116- if enable_lto is True :
117- raise ValueError ('Configuration enable_lto=True, but '
118- 'CFLAGS contains -fno-lto' )
119- enable_lto = False
120- cppflags = []
121- if 'CPPFLAGS' in os .environ :
122- cppflags .append (os .environ ['CPPFLAGS' ])
123- if '-fno-lto' in os .environ ['CPPFLAGS' ]:
124- if enable_lto is True :
125- raise ValueError ('Configuration enable_lto=True, but '
126- 'CPPFLAGS contains -fno-lto' )
127- enable_lto = False
128- cxxflags = []
129- if 'CXXFLAGS' in os .environ :
130- cxxflags .append (os .environ ['CXXFLAGS' ])
131- if '-fno-lto' in os .environ ['CXXFLAGS' ]:
132- if enable_lto is True :
133- raise ValueError ('Configuration enable_lto=True, but '
134- 'CXXFLAGS contains -fno-lto' )
135- enable_lto = False
136- ldflags = []
137- if 'LDFLAGS' in os .environ :
138- ldflags .append (os .environ ['LDFLAGS' ])
114+ def prepare_flags (name ,enable_lto ):
115+ """
116+ Prepare *FLAGS from the environment.
117+
118+ If set, return them, and also check whether LTO is disabled in each
119+ one, raising an error if Matplotlib config explicitly enabled LTO.
120+ """
121+ flags = []
122+ if name in os .environ :
123+ flags .append (os .environ [name ])
124+ if '-fno-lto' in os .environ [name ]:
125+ if enable_lto is True :
126+ raise ValueError ('Configuration enable_lto=True, but '
127+ '{0} contains -fno-lto' .format (name ))
128+ enable_lto = False
129+ return flags ,enable_lto
130+
131+ _ ,enable_lto = prepare_flags ('CFLAGS' ,enable_lto )# Only check lto.
132+ cppflags ,enable_lto = prepare_flags ('CPPFLAGS' ,enable_lto )
133+ cxxflags ,enable_lto = prepare_flags ('CXXFLAGS' ,enable_lto )
134+ ldflags ,enable_lto = prepare_flags ('LDFLAGS' ,enable_lto )
139135
140136if enable_lto is False :
141137return env