[git commit branch/0.9.33] buildsys: gen_bits_syscall_h: do not leave undefined SYS_xxx around

[Mike Frysinger]

commit: http://git.uclibc.org/uClibc/commit/?id=29411db7b6cf872e73b5560c46dd941f91e704cd
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/0.9.33

If we end up doing '#undef __NR_xxx', we don't want to leave the
corresponding SYS_xxx symbol defined.  So undef it too.

For example, with the ARM EABI layer, we have a bunch of legacy
syscalls that we define early on and then later undefine (such
as __NR_utime).  But we left SYS_utime defined so code that tests
for that define before using it would be broken (since it'd be
defined to a non-existent symbol).

URL: https://bugs.gentoo.org/425006
Signed-off-by: Mike Frysinger <vapier at gentoo.org>
---
 extra/scripts/gen_bits_syscall_h.sh |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/extra/scripts/gen_bits_syscall_h.sh b/extra/scripts/gen_bits_syscall_h.sh
index f6353ba..fd141f0 100755
--- a/extra/scripts/gen_bits_syscall_h.sh
+++ b/extra/scripts/gen_bits_syscall_h.sh
@@ -40,7 +40,8 @@ $CC -E $INCLUDE_OPTS - |
   sed -ne 's/^UCLIBC\(__ARM_NR_\|__NR_\)\([A-Za-z0-9_]*\) *\(.*\)/#undef \1\2\
 #define \1\2 \3\
 #define SYS_\2 \1\2/gp' \
-     -e 's/^UNDEFUCLIBC\(__ARM_NR_\|__NR_\)\([A-Za-z0-9_]*\).*/#undef \1\2/gp'
+     -e 's/^UNDEFUCLIBC\(__ARM_NR_\|__NR_\)\([A-Za-z0-9_]*\).*/#undef \1\2\
+#undef SYS_\2/gp'
   echo ;
   echo "#endif" ;
 )