Include extra compiler flags

Given the last attempts to clean up the code, this commit adds extra
compiler flags that are useful to keep the codebase sane.  The added
flags, for now, are:

  -Wall -Werror -Wextra -Wunused -Wunused-variable

diff --git a/configure.ac b/configure.ac
index a9cce1f..77fc984 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -29,6 +29,7 @@ AM_INIT_AUTOMAKE
 dnl Do we have a usable compiler and 'install'?
 AC_PROG_CC
 AC_PROG_INSTALL
+AC_LANG_WERROR
 
 dnl Checking for GNUTLS and libgcrypt.
 PKG_CHECK_MODULES(GNUTLS, gnutls >= 1.4.0, , AC_MSG_ERROR(Could not find gnutls))
@@ -36,7 +37,9 @@ AM_PATH_LIBGCRYPT(,,AC_MSG_ERROR(Could not find gcrypt))
 
 dnl Setting useful flags.
 LIBS="$LIBGCRYPT_LIBS $GNUTLS_LIBS $LIBS -lz"
-CFLAGS="$LIBGCRYPT_CFLAGS $GNUTLS_CFLAGS $CFLAGS"
+CFLAGS="$LIBGCRYPT_CFLAGS $GNUTLS_CFLAGS \
+       -Wall -Werror -Wextra -Wunused -Wunused-variable \
+       $CFLAGS"
 
 dnl Outputting the necessary files for the build.
 AC_CONFIG_HEADERS([config.h])