Issue #8211: Save/restore CFLAGS around AC_PROG_CC in configure.in, compiler

optimizations are disabled when --with-pydebug is used.

Misc/NEWS

@@ -12,6 +12,9 @@ What's New in Python 2.7 beta 1?
 Core and Builtins
 -----------------
 
+- Issue #8211: Save/restore CFLAGS around AC_PROG_CC in configure.in, compiler
+  optimizations are disabled when --with-pydebug is used.
+
 - Issue #1583863: An unicode subclass can now override the __unicode__ method
 
 - Issue #6474: Make error message from passing an inadequate number of keyword

configure

@@ -2367,6 +2367,7 @@ echo "$as_me: error: cached CC is different -- throw away $cache_file
    { (exit 1); exit 1; }; }
 fi
 
+save_CFLAGS=$CFLAGS
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -3286,6 +3287,7 @@ ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
+CFLAGS=$save_CFLAGS
 
 
 

configure.in

@@ -493,7 +493,9 @@ then
 (it is also a good idea to do 'make clean' before compiling)])
 fi
 
+save_CFLAGS=$CFLAGS
 AC_PROG_CC
+CFLAGS=$save_CFLAGS
 
 AC_SUBST(CXX)
 AC_SUBST(MAINCC)