tox.ini (macos-nohomebrew): Pass compiler configuration to configure …

…using variables other than CC, CXX.

Previously, they were in the environment also at 'make' time
and due to our design in 'sage-env' override the actual
configured compilers from the 'configure' run, which
includes additional options (-std=....)

build/bin/sage-spkg

@@ -646,6 +646,8 @@ fi
 # Actually install
 ##################################################################
 
+env
+
 # Set the $SAGE_DESTDIR variable to be passed to the spkg-install
 # script (the script itself could set this, but better to standardize
 # this in one place)

tox.ini

@@ -417,9 +417,9 @@ setenv =
     gcc_9:                    CONFIG_CONFIGURE_ARGS_2=--with-system-gcc=force CC=gcc-9 CXX=g++-9 FC=gfortran-9
     gcc_10:                   CONFIG_CONFIGURE_ARGS_2=--with-system-gcc=force CC=gcc-10 CXX=g++-10 FC=gfortran-10
     gcc_11:                   CONFIG_CONFIGURE_ARGS_2=--with-system-gcc=force CC=gcc-11 CXX=g++-11 FC=gfortran-11
-    macos-nohomebrew:         CONFIG_CONFIGURE_ARGS_2=--with-system-gcc=force --with-mp=gmp --without-system-mpfr --without-system-readline
-    macos-nohomebrew:           CXX=g++ -isysroot {env:MACOS_SDK}
-    macos-nohomebrew:            CC=gcc -isysroot {env:MACOS_SDK}
+    macos-nohomebrew:         CONFIG_CONFIGURE_ARGS_2=--with-system-gcc=force CC="$CONFIGURED_CC" CXX="$CONFIGURED_CXX" --with-mp=gmp --without-system-mpfr --without-system-readline --without-system-boost
+    macos-nohomebrew:           CONFIGURED_CXX=g++ -isysroot {env:MACOS_SDK}
+    macos-nohomebrew:           CONFIGURED_CC=gcc -isysroot {env:MACOS_SDK}
     # We use libgd only used in a very limited way, in {matrix,vector}_mod_2_dense.  Disable search for other packages.
     macos-nohomebrew:             LIBGD_CONFIGURE=--without-freetype --without-raqm --without-fontconfig --without-jpeg --without-liq --without-xpm --without-tiff --without-webp --without-heif --without-avif
     macos:                        MACOS_SDK=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk