rtems: Copy cmetric rules from linux snippet

The previous rules failed when /bin/sh did not support 'set -o pipefail'
(such as in case of dash).

diff --git a/snippets/rtems.omk b/snippets/rtems.omk
index 47a18b062516e9aa5509821d010a36e5e3f27309..d42cfe20f8b209d03ed0a8ec80888c8d59027f63 100644 (file)
--- a/snippets/rtems.omk
+++ b/snippets/rtems.omk
@@ -168,15 +168,22 @@ $(2): $(1)
        $(Q)if [ -n `dirname $$@` ] ; then \
              if [ ! -e `dirname $$@` ] ; then \
                mkdir -p `dirname $$@` ; fi ; fi
-       $(Q)echo >$$@ '/* Automatically generated from $$< */'
-       $(Q)echo >>$$@ '/* Conditionals to control compilation */'
-       $(Q)set -o pipefail ; $(NM) $$< \
+       $(Q)echo >$$@.tmp '/* Automatically generated from $$< */'
+       $(Q)echo >>$$@.tmp '/* Conditionals to control compilation */'
+# Bellow, the tricks with redirection are for shells without set -o pipefail
+# (see http://www.mail-archive.com/dash@vger.kernel.org/msg00149.html)
+       $(Q)exec 3>&1; status=`exec 4>&1 >&3; { $(NM) $$<; echo $$$$? >&4; }\
                | sed -n 's/^ *0*\(0[0-9A-Fa-f]*\) *A *_cmetric2cond_\([A-Za-z_0-9]*\) */#define \2 0x\1/p' \
-               | sort >>$$@
-       $(Q)echo >>$$@ '/* Defines from the values defined to symbols */'
-       $(Q)set -o pipefail ; $(NM) $$< \
+               | sort >>$$@.tmp` && exit $$$$status
+       $(Q)echo >>$$@.tmp '/* Defines from the values defined to symbols in hexadecimal format */'
+       $(Q)exec 3>&1; status=`exec 4>&1 >&3; { $(NM) $$<; echo $$$$? >&4; }\
                | sed -n 's/^ *0*\(0[0-9A-Fa-f]*\) *A *_cmetric2def_\([A-Za-z_0-9]*\) */#define \2 0x\1/p' \
-               | sort >>$$@
+               | sort >>$$@.tmp` && exit $$$$status
+       $(Q)echo >>$$@.tmp '/* Defines from the values defined to symbols in decimal format */'
+       $(Q)exec 3>&1; status=`exec 4>&1 >&3; { $(NM) -td $$<; echo $$$$? >&4; }\
+               | sed -n 's/^ *0*\(0\|[1-9][0-9]*\) *A *_cmetric2defdec_\([A-Za-z_0-9]*\) */#define \2 \1/p' \
+               | sort >>$$@.tmp` && exit $$$$status
+       $(Q)mv $$@.tmp $$@
 endef
 
 idl_COMPILE = $(IDL_COMPILER)