[hackers] [scc] Add #elif || Roberto E. Vargas Caballero

[git]

commit aaf9dd81207b3944018233ca15f6befa871aaf0f
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Mon Jul 27 10:56:43 2015 +0200
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Mon Jul 27 10:56:43 2015 +0200

    Add #elif
    
    The implemetation of elif is really easy, it is a #else chained
    with a #if.

diff --git a/cc1/cc1.h b/cc1/cc1.h
index 8da3585..84982e2 100644
--- a/cc1/cc1.h
+++ b/cc1/cc1.h
@@ -214,6 +214,7 @@ enum tokens {
        PRAGMA,
        ERROR,
        IFDEF,
+       ELIF,
        IFNDEF,
        UNDEF,
        ENDIF,
diff --git a/cc1/cpp.c b/cc1/cpp.c
index 9099840..7dab27e 100644
--- a/cc1/cpp.c
+++ b/cc1/cpp.c
@@ -522,6 +522,13 @@ elseclause(void)
 }
 
 static void
+elif(void)
+{
+       elseclause();
+       ifclause(0, 0);
+}
+
+static void
 undef(void)
 {
        Symbol *sym;
@@ -549,6 +556,7 @@ cpp(void)
                {LINE, line},
                {IFDEF, ifdef},
                {IF, cppif},
+               {ELIF, elif},
                {IFNDEF, ifndef},
                {ELSE, elseclause},
                {ENDIF, endif},
diff --git a/cc1/symbol.c b/cc1/symbol.c
index 8c86de2..0b672fb 100644
--- a/cc1/symbol.c
+++ b/cc1/symbol.c
@@ -263,6 +263,7 @@ ikeywords(void)
                {"line", LINE, LINE},
                {"ifdef", IFDEF, IFDEF},
                {"if", IF, IF},
+               {"elif", ELIF, ELIF},
                {"else", ELSE, ELSE},
                {"ifndef", IFNDEF, IFNDEF},
                {"endif", ENDIF, ENDIF},