build: disable warnings on cast alignments

clang is often wront about it (it increases alignment requirement, but
the surrounding structure ensure the alignment is correct). Dunno if
gcc is smarter or just ignore most of these problems.

diff --git a/configure.ac b/configure.ac
index 3d86fe2ec346627f96afe9df4cad003d08f69137..2741f374a81ef6b2cfaeca253241c80537e22e59 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -78,12 +78,12 @@ AX_CFLAGS_GCC_OPTION([-Wformat], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wformat-security], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wimplicit-fallthrough], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wfatal-errors], [LLDP_CFLAGS])
-AX_CFLAGS_GCC_OPTION([-Wcast-align], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wheader-guard], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wdocumentation], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Winline], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wpointer-arith], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-fno-omit-frame-pointer], [LLDP_CFLAGS])
+AX_CFLAGS_GCC_OPTION([-Wno-cast-align], [LLDP_CFLAGS]) dnl clang is bad at this
 AX_CFLAGS_GCC_OPTION([-Wno-unused-parameter], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wno-missing-field-initializers], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wno-sign-compare], [LLDP_CFLAGS]) dnl Should be fixed later