Reduce size of httpd binary by telling linker to export all symbols
from libmain.a, rather than bloating the symbol table with ap_hack_*
to do so indirectly.

Upstream: https://svn.apache.org/r1861685 (as new default-off configure option)

--- httpd-2.4.39/Makefile.in.export
+++ httpd-2.4.39/Makefile.in
@@ -4,8 +4,15 @@
 
 PROGRAM_NAME         = $(progname)
 PROGRAM_SOURCES      = modules.c
-PROGRAM_LDADD        = buildmark.o $(HTTPD_LDFLAGS) $(PROGRAM_DEPENDENCIES) $(HTTPD_LIBS) $(EXTRA_LIBS) $(AP_LIBS) $(LIBS)
+PROGRAM_LDADD        = buildmark.o $(HTTPD_LDFLAGS) \
+	$(PROGRAM_LDDEPS)  \
+	$(HTTPD_LIBS) $(EXTRA_LIBS) $(AP_LIBS) $(LIBS)
 PROGRAM_PRELINK      = $(COMPILE) -c $(top_srcdir)/server/buildmark.c
+PROGRAM_LDDEPS = \
+  $(BUILTIN_LIBS) \
+  $(MPM_LIB) \
+  -Wl,--whole-archive,server/.libs/libmain.a,--no-whole-archive \
+  os/$(OS_DIR)/libos.la
 PROGRAM_DEPENDENCIES = \
   server/libmain.la \
   $(BUILTIN_LIBS) \
--- httpd-2.4.39/server/main.c.export
+++ httpd-2.4.39/server/main.c
@@ -835,17 +835,3 @@
     return !OK;
 }
 
-#ifdef AP_USING_AUTOCONF
-/* This ugly little hack pulls any function referenced in exports.c into
- * the web server.  exports.c is generated during the build, and it
- * has all of the APR functions specified by the apr/apr.exports and
- * apr-util/aprutil.exports files.
- */
-const void *ap_suck_in_APR(void);
-const void *ap_suck_in_APR(void)
-{
-    extern const void *ap_ugly_hack;
-
-    return ap_ugly_hack;
-}
-#endif
--- httpd-2.4.39/server/Makefile.in.export
+++ httpd-2.4.39/server/Makefile.in
@@ -12,7 +12,7 @@
 	connection.c listen.c util_mutex.c \
 	mpm_common.c mpm_unix.c mpm_fdqueue.c \
 	util_charset.c util_cookies.c util_debug.c util_xml.c \
-	util_filter.c util_pcre.c util_regex.c exports.c \
+	util_filter.c util_pcre.c util_regex.c \
 	scoreboard.c error_bucket.c protocol.c core.c request.c provider.c \
 	eoc_bucket.c eor_bucket.c core_filters.c \
 	util_expr_parse.c util_expr_scan.c util_expr_eval.c