Improve the exports generating awk script. In the past, we had

work around problems in the awk script by avoiding some #if and
#ifdefs.  This has bitten us many times in generating the exports.c
file.  This improvement allows corrects the header file parsing.

Submitted by:	Sander Striker <striker@apache.org>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89647 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 120 insertions, 0 deletions

diff --git a/build/make_exports.awk b/build/make_exports.awk
new file mode 100644
index 0000000000..27fd631eb9
--- /dev/null
+++ b/build/make_exports.awk
@@ -0,0 +1,120 @@
+
+BEGIN {
+    printf("/*\n")
+    printf(" * THIS FILE WAS AUTOGENERATED BY make_exports.awk\n")
+    printf(" *\n")
+    printf(" * This is an ugly hack that needs to be here, so\n")
+    printf(" * that libtool will link all of the APR functions\n")
+    printf(" * into server regardless of whether the base server\n")
+    printf(" * uses them.\n")
+    printf(" */\n")
+    printf("\n")
+    printf("#define CORE_PRIVATE\n")
+    printf("\n")
+    
+    for (i = 1; i < ARGC; i++) {
+        file = ARGV[i]
+        sub("([^/]*[/])*", "", file)
+        printf("#include \"%s\"\n", file)
+    }
+
+    printf("\n")
+    printf("const void *ap_ugly_hack = NULL;\n")
+    printf("\n")
+    
+    TYPE_NORMAL = 0
+    TYPE_HEADER = 1
+
+    stackptr = 0
+}
+
+function push(line) {
+    stack[stackptr] = line
+    stackptr++
+}
+
+function do_output() {
+    printf("/*\n")
+    printf(" * %s\n", FILENAME)
+    printf(" */\n")
+    
+    for (i = 0; i < stackptr; i++) {
+        printf("%s\n", stack[i])
+    }
+    
+    stackptr = 0
+
+    printf("\n");
+}
+
+function enter_scope(type) {
+    scope++
+    scope_type[scope] = type
+    scope_stack[scope] = stackptr
+    delete scope_used[scope]
+}
+
+function leave_scope() {
+    used = scope_used[scope]
+   
+    if (!used)
+        stackptr = scope_stack[scope]
+
+    scope--
+    if (used) {
+        scope_used[scope] = 1
+        
+        if (!scope)
+            do_output()
+    }
+}
+
+function add_symbol(symbol) {
+    idx = index(symbol, "#")
+
+    if (!idx) {
+        push("const void *ap_hack_" symbol " = (const void *)" symbol ";")
+        scope_used[scope] = 1
+    }
+}
+
+/^[ \t]*AP[RU]?_DECLARE[^(]*[(][^)]*[)]([^ ]* )*[^(]+[(]/  { 
+    sub("[ \t]*AP[RU]?_DECLARE[^(]*[(][^)]*[)]", "");
+    sub("[(].*", "");
+    sub("^[ \t]+", "");
+    sub("([^ ]* ^([ \t]*[(]))*", "");
+
+    add_symbol($0)
+    next
+}
+
+/^#[ \t]*if(ndef| !defined[(])([^_]*_)*H/ {
+    enter_scope(TYPE_HEADER)
+    next
+}
+
+/^#[ \t]*if([n]?def)? / {
+    enter_scope(TYPE_NORMAL)
+    push($0)
+    next
+}
+
+/^#[ \t]*endif/ {
+    if (scope_type[scope] == TYPE_NORMAL)
+        push($0)
+        
+    leave_scope()
+    next
+}
+
+/^#[ \t]*else/ {
+    push($0)
+    next
+}
+
+/^#[ \t]*elif/ {
+    push($0)
+    next
+}
+
+