From a37b06d7354c5cfec0e88dc22a8a5d784551f1b3 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Fri, 18 Dec 2015 15:37:17 +0100
Subject: add '--enable-debug' configure option to build with EMIT_ASN_DEBUG

... which in turn causes all the ASN_DEBUG() to be turned into
fprintf(stderr, ...) statements, once the user application decides
to set 'asn_debug = 1' somewhere in its code.

The next step would be to make _ASN_DECODE_FAILED / _ASN_ENCODE_FAILED
no longer depend on ASN_DEBUG (which it currently does)
---
 configure.ac               | 4 ++++
 include/asn1c/asn_system.h | 2 ++
 src/Makefile.am            | 3 +++
 src/asn_codecs_prim.c      | 4 ++++
 4 files changed, 13 insertions(+)

diff --git a/configure.ac b/configure.ac
index b8b5743..aaa2b5a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,10 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],
 CFLAGS="$saved_CFLAGS"
 AC_SUBST(SYMBOL_VISIBILITY)
 
+AC_ARG_ENABLE([debug], [AS_HELP_STRING([--enable-debug], [Buld the library with EMIT_ASN_DEBUG enabled])],
+		[build_debug="$enableval"], [build_debug="no"])
+AM_CONDITIONAL(BUILD_DEBUG, test "x$build_debug" = "xyes")
+
 AC_OUTPUT(
         libasn1c.pc
         src/Makefile
diff --git a/include/asn1c/asn_system.h b/include/asn1c/asn_system.h
index e420ad2..fe8a377 100644
--- a/include/asn1c/asn_system.h
+++ b/include/asn1c/asn_system.h
@@ -21,6 +21,8 @@
 #include <stdarg.h>	/* For va_start */
 #include <stddef.h>	/* for offsetof and ptrdiff_t */
 
+extern int asn_debug;
+
 #ifdef	_WIN32
 
 #include <malloc.h>
diff --git a/src/Makefile.am b/src/Makefile.am
index 633cc04..8004b37 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -5,6 +5,9 @@ LIBVERSION=1:0:0
 
 AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include/asn1c
 AM_CFLAGS = -fPIC -Wall $(LIBOSMOCORE_CFLAGS)
+if BUILD_DEBUG
+AM_CFLAGS += -DEMIT_ASN_DEBUG=1
+endif
 
 lib_LTLIBRARIES = libasn1c.la
 
diff --git a/src/asn_codecs_prim.c b/src/asn_codecs_prim.c
index 8e604a4..53d20c0 100644
--- a/src/asn_codecs_prim.c
+++ b/src/asn_codecs_prim.c
@@ -6,6 +6,10 @@
 #include <asn_codecs_prim.h>
 #include <errno.h>
 
+#if	EMIT_ASN_DEBUG == 1
+int asn_debug = 0;
+#endif
+
 /*
  * Decode an always-primitive type.
  */
-- 
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