Add --disable-werror

Allow the user to disable -Werror through --disable-werror

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>

Makefile.am

@@ -2,7 +2,10 @@ ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 lib_LTLIBRARIES = libkcapi.la
 
-COMMON_CPPFLAGS = -Wextra -Wall -pedantic -fwrapv --param ssp-buffer-size=4 -O2 -Werror -std=gnu99 -Wconversion
+COMMON_CPPFLAGS = -Wextra -Wall -pedantic -fwrapv --param ssp-buffer-size=4 -O2 -std=gnu99 -Wconversion
+if ENABLE_WERROR
+COMMON_CPPFLAGS += -Werror
+endif
 COMMON_LDFLAGS =  -Wl,-z,relro,-z,now
 
 libtool: $(LIBTOOL_DEPS)

configure.ac

@@ -76,6 +76,9 @@ AX_ADD_FORTIFY_SOURCE
 
 AC_CHECK_API_VERSION
 
+AC_ARG_ENABLE([werror], [AS_HELP_STRING([--disable-werror], [Disable -Werror])], [with_werror=$enableval], [with_werror=yes])
+AM_CONDITIONAL([ENABLE_WERROR], [test "x$with_werror" = "xyes"])
+
 AC_ARG_ENABLE([kcapi-test], [AS_HELP_STRING([--enable-kcapi-test], [Compile kcapi test program])], [with_kcapi_test=$enableval])
 AM_CONDITIONAL([ENABLE_KCAPI_TEST], [test "x$with_kcapi_test" = "xyes"])