Followup to commit 3f751cb addresses

https://github.com/DOCGroup/ACE_TAO/pull/567#issuecomment-360504123 ,

> [...] the Solaris/SunCC build failed because its preprocessor splits
> the @ from the following token:
>
> $ echo '@foo' > /tmp/foo.c && /opt/compilers/suncc5.12/bin/CC -E \
>   /tmp/foo.c && rm /tmp/foo.c
> #1 "/tmp/foo.c"
> @ foo

TAO/TAO_IDL/fe/idl.ll
- Modify the rule matching annotations to include an optional space
  after the '@',
  @ ?[A-Za-z][A-Za-z0-9_]*[ \t]*(\([^)]+\))?

1 files changed, 3 insertions, 2 deletions

diff --git a/TAO/TAO_IDL/fe/idl.ll b/TAO/TAO_IDL/fe/idl.ll
index 34b42a350cb..7e1fc9cac6e 100644
--- a/TAO/TAO_IDL/fe/idl.ll
+++ b/TAO/TAO_IDL/fe/idl.ll
@@ -403,8 +403,9 @@ L"'"\\u([0-9a-fA-F]{1,4})"'" {
                     }
                   break;
                 }
-@[A-Za-z][A-Za-z0-9_]*[ \t]*(\([^)]+\))?
-                break;
+@ ?[A-Za-z][A-Za-z0-9_]*[ \t]*(\([^)]+\))? {
+                  break;
+                }
 [ \t]*          break;
 {NL}            {
                   idl_global->set_lineno (idl_global->lineno () + 1);