scripts: fix symbol overriding in configuration

When redefining the same symbol in configuration (basically after an inclusion),
we need to undefine the previous symbol to avoid "redefined" errors.

Signed-off-by: David Marchand <david.marchand@6wind.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>

diff --git a/scripts/gen-config-h.sh b/scripts/gen-config-h.sh
index efd7667..2fac08c 100755 (executable)
--- a/scripts/gen-config-h.sh
+++ b/scripts/gen-config-h.sh
@@ -33,11 +33,11 @@
 
 echo "#ifndef __RTE_CONFIG_H"
 echo "#define __RTE_CONFIG_H"
-grep CONFIG_ $1                                                         \
-| grep -v '^[ \t]*#'                                                    \
-| sed 's,CONFIG_\(.*\)=y.*$,#define \1 1,'                      \
-| sed 's,CONFIG_\(.*\)=n.*$,#undef \1,'                                 \
-| sed 's,CONFIG_\(.*\)=\(.*\)$,#define \1 \2,'                  \
-| sed 's,\# CONFIG_\(.*\) is not set$,#undef \1,'
+grep CONFIG_ $1 |
+grep -v '^[ \t]*#' |
+sed 's,CONFIG_\(.*\)=y.*$,#undef \1\n#define \1 1,' |
+sed 's,CONFIG_\(.*\)=n.*$,#undef \1,' |
+sed 's,CONFIG_\(.*\)=\(.*\)$,#undef \1\n#define \1 \2,' |
+sed 's,\# CONFIG_\(.*\) is not set$,#undef \1,'
 echo "#endif /* __RTE_CONFIG_H */"