Fix CC/CXX exports and allow overrides like CFLAGS and CXXFLAGS

Some packages require being able to redefine the compiler variables
set to add additional base arguments that must be used everywhere.
This change makes it possible for that to work correctly.

macros

@@ -100,8 +100,8 @@
   FCFLAGS="${FCFLAGS:-%{build_fflags}}" ; export FCFLAGS ; \
   LDFLAGS="${LDFLAGS:-%{build_ldflags}}" ; export LDFLAGS ; \
   LT_SYS_LIBRARY_PATH="${LT_SYS_LIBRARY_PATH:-%_libdir:}" ; export LT_SYS_LIBRARY_PATH ; \
-  CC=%{__cc}; export CC ; \
-  CXX=%{__cxx}; export CXX
+  CC="${CC:-%{__cc}}" ; export CC ; \
+  CXX="${CXX:-%{__cxx}}" ; export CXX
 
 # Internal-only.  Do not use.  Expand a variable and strip the flags
 # not suitable to extension builders.

redhat-rpm-config.spec

@@ -6,7 +6,7 @@
 
 Summary: Red Hat specific rpm configuration files
 Name: redhat-rpm-config
-Version: 167
+Version: 168
 Release: 1%{?dist}
 # No version specified.
 License: GPL+
@@ -212,6 +212,10 @@ install -p -m 644 -t %{buildroot}%{_rpmluadir}/fedora/srpm forge.lua
 %{_rpmconfigdir}/macros.d/macros.kmp
 
 %changelog
+* Thu Aug 20 2020 Neal Gompa <ngompa13@gmail.com> - 168-1
+- Fix CC/CXX exports so arguments are included in exported variable
+- Allow overrides of CC/CXX like CFLAGS and CXXFLAGS from shell variables
+
 * Mon Aug 03 2020 Troy Dawson <tdawson@redhat.com> - 167-1
 - Add Requires: kernel-srpm-macros