build: allow more modern coding style with empty initializers

In C99, we can do:

     struct ifreq ifr = {};

Instead of

     struct ifreq ifr;
     memset(&ifr, 0. sizeof(ifr));

We disable the empty initializer warning to allow this. Moreover, we
also allow to mix code and declarations.

diff --git a/configure.ac b/configure.ac
index 9b47ae32f3ac63f3cb6e8cc9d57a39a6371d43ad..8ec60e027c3740db5b7994994d421b1f6e458167 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -60,12 +60,13 @@ AX_CFLAGS_GCC_OPTION([-W])
 AX_CFLAGS_GCC_OPTION([-Wextra])
 AX_CFLAGS_GCC_OPTION([-Wformat])
 AX_CFLAGS_GCC_OPTION([-Wformat-security])
+AX_CFLAGS_GCC_OPTION([-Wfatal-errors])
 AX_CFLAGS_GCC_OPTION([-Wcast-align])
 AX_CFLAGS_GCC_OPTION([-Winline])
 AX_CFLAGS_GCC_OPTION([-fstack-protector])
 AX_CFLAGS_GCC_OPTION([-D_FORTIFY_SOURCE=2])
-AX_CFLAGS_GCC_OPTION([-Wdeclaration-after-statement])
 AX_CFLAGS_GCC_OPTION([-Wno-unused-parameter])
+AX_CFLAGS_GCC_OPTION([-Wno-missing-field-initializers])
 AX_CFLAGS_GCC_OPTION([-Wno-sign-compare]) dnl Should be fixed later
 AX_LDFLAGS_OPTION([-Wl,-z,relro])
 AX_LDFLAGS_OPTION([-Wl,-z,now])