configure.ac: Add #include guard to config.h.

[libserialport.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index f01644b95c2f1a89c5e73e34a47f4fa1f689206d..5818778912c6e033fb8aa039b353f85db08983d0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -33,13 +33,17 @@ AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([autostuff])
 AC_CONFIG_AUX_DIR([autostuff])
 
+AH_TOP([#ifndef SP_CONFIG_H
+#define SP_CONFIG_H])
+AH_BOTTOM([#endif])
+
 # We require at least automake 1.11 (needed for 'silent rules').
 AM_INIT_AUTOMAKE([1.11 -Wall -Werror check-news])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 
 # Enable more compiler warnings.
-CFLAGS="$CFLAGS -std=c99 -Wall -Wextra -pedantic -Wmissing-prototypes"
+CFLAGS="$CFLAGS -std=c99 -Wall -Wextra -pedantic -Wmissing-prototypes -Wshadow"
 
 # Checks for programs.
 AC_PROG_CC