Re: [Qemu-devel] [PATCH] slirp: Replace QEMU_BUILD_BUG_ON with own macro

[Samuel Thibault <samuel.thibault@gnu.org>]

(Which I'll fold as appropriate within Marc-André's patch series)

Samuel Thibault, le dim. 27 janv. 2019 02:51:13 +0100, a ecrit:
> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
> ---
>  slirp/ip.h       |  6 ++++--
>  slirp/ip6.h      |  6 ++++--
>  slirp/ip6_icmp.h | 12 +++++++-----
>  slirp/util.h     | 25 +++++++++++++++++++++++++
>  4 files changed, 40 insertions(+), 9 deletions(-)
> 
> diff --git a/slirp/ip.h b/slirp/ip.h
> index 2baeeb9a3a..77182e61a9 100644
> --- a/slirp/ip.h
> +++ b/slirp/ip.h
> @@ -35,6 +35,8 @@
>  
>  #include <glib.h>
>  
> +#include "util.h"
> +
>  #if G_BYTE_ORDER == G_BIG_ENDIAN
>  # undef NTOHL
>  # undef NTOHS
> @@ -229,8 +231,8 @@ struct	ipasfrag {
>  	struct ip ipf_ip;
>  };
>  
> -QEMU_BUILD_BUG_ON(offsetof(struct ipq, frag_link) !=
> -                  offsetof(struct ipasfrag, ipf_link));
> +SLIRP_BUILD_BUG_ON(offsetof(struct ipq, frag_link) !=
> +                   offsetof(struct ipasfrag, ipf_link));
>  
>  #define ipf_off      ipf_ip.ip_off
>  #define ipf_tos      ipf_ip.ip_tos
> diff --git a/slirp/ip6.h b/slirp/ip6.h
> index 4e7c366505..3db099acef 100644
> --- a/slirp/ip6.h
> +++ b/slirp/ip6.h
> @@ -8,6 +8,8 @@
>  
>  #include <glib.h>
>  
> +#include "util.h"
> +
>  #define ALLNODES_MULTICAST  { .s6_addr = \
>                              { 0xff, 0x02, 0x00, 0x00,\
>                              0x00, 0x00, 0x00, 0x00,\
> @@ -152,7 +154,7 @@ struct ip6_pseudohdr {
>   * If we marked the struct as packed then we would be unable to take
>   * the address of any of the fields in it.
>   */
> -QEMU_BUILD_BUG_ON(sizeof(struct ip6) != 40);
> -QEMU_BUILD_BUG_ON(sizeof(struct ip6_pseudohdr) != 40);
> +SLIRP_BUILD_BUG_ON(sizeof(struct ip6) != 40);
> +SLIRP_BUILD_BUG_ON(sizeof(struct ip6_pseudohdr) != 40);
>  
>  #endif
> diff --git a/slirp/ip6_icmp.h b/slirp/ip6_icmp.h
> index 3f44ed2f49..ea7fcfe5e6 100644
> --- a/slirp/ip6_icmp.h
> +++ b/slirp/ip6_icmp.h
> @@ -6,6 +6,8 @@
>  #ifndef SLIRP_IP6_ICMP_H
>  #define SLIRP_IP6_ICMP_H
>  
> +#include "util.h"
> +
>  /*
>   * Interface Control Message Protocol version 6 Definitions.
>   * Per RFC 4443, March 2006.
> @@ -50,14 +52,14 @@ struct ndp_ra {     /* Router Advertisement Message */
>      uint32_t retrans_time;  /* Retrans Timer */
>  };
>  
> -QEMU_BUILD_BUG_ON(sizeof(struct ndp_ra) != 12);
> +SLIRP_BUILD_BUG_ON(sizeof(struct ndp_ra) != 12);
>  
>  struct ndp_ns {     /* Neighbor Solicitation Message */
>      uint32_t reserved;
>      struct in6_addr target; /* Target Address */
>  };
>  
> -QEMU_BUILD_BUG_ON(sizeof(struct ndp_ns) != 20);
> +SLIRP_BUILD_BUG_ON(sizeof(struct ndp_ns) != 20);
>  
>  struct ndp_na {     /* Neighbor Advertisement Message */
>  #if G_BYTE_ORDER == G_BIG_ENDIAN
> @@ -78,7 +80,7 @@ struct ndp_na {     /* Neighbor Advertisement Message */
>      struct in6_addr target; /* Target Address */
>  };
>  
> -QEMU_BUILD_BUG_ON(sizeof(struct ndp_na) != 20);
> +SLIRP_BUILD_BUG_ON(sizeof(struct ndp_na) != 20);
>  
>  struct ndp_redirect {
>      uint32_t reserved;
> @@ -86,7 +88,7 @@ struct ndp_redirect {
>      struct in6_addr dest;   /* Destination Address */
>  };
>  
> -QEMU_BUILD_BUG_ON(sizeof(struct ndp_redirect) != 36);
> +SLIRP_BUILD_BUG_ON(sizeof(struct ndp_redirect) != 36);
>  
>  /*
>   * Structure of an icmpv6 header.
> @@ -113,7 +115,7 @@ struct icmp6 {
>  #define icmp6_redirect icmp6_body.ndp_redirect
>  };
>  
> -QEMU_BUILD_BUG_ON(sizeof(struct icmp6) != 40);
> +SLIRP_BUILD_BUG_ON(sizeof(struct icmp6) != 40);
>  
>  #define ICMP6_MINLEN    4
>  #define ICMP6_ERROR_MINLEN  8
> diff --git a/slirp/util.h b/slirp/util.h
> index ef75804560..fc2c2e58fe 100644
> --- a/slirp/util.h
> +++ b/slirp/util.h
> @@ -48,6 +48,31 @@
>  # define SLIRP_PACKED __attribute__((packed))
>  #endif
>  
> +#ifndef glue
> +#define xglue(x, y) x ## y
> +#define glue(x, y) xglue(x, y)
> +#endif
> +
> +#define SLIRP_BUILD_BUG_ON_STRUCT(x) \
> +    struct { \
> +        int:(x) ? -1 : 1; \
> +    }
> +
> +/* SLIRP_BUILD_BUG_MSG() emits the message given if _Static_assert is
> + * supported; otherwise, it will be omitted from the compiler error
> + * message (but as it remains present in the source code, it can still
> + * be useful when debugging). */
> +#if defined(CONFIG_STATIC_ASSERT)
> +#define SLIRP_BUILD_BUG_MSG(x, msg) _Static_assert(!(x), msg)
> +#elif defined(__COUNTER__)
> +#define SLIRP_BUILD_BUG_MSG(x, msg) typedef SLIRP_BUILD_BUG_ON_STRUCT(x) \
> +    glue(qemu_build_bug_on__, __COUNTER__) __attribute__((unused))
> +#else
> +#define SLIRP_BUILD_BUG_MSG(x, msg)
> +#endif
> +
> +#define SLIRP_BUILD_BUG_ON(x) SLIRP_BUILD_BUG_MSG(x, "not expecting: " #x)
> +
>  #define SCALE_MS 1000000
>  
>  #define ETH_ALEN    6
> -- 
> 2.20.1
> 

-- 
Samuel
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