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freebsd11_network: Restore the old mbuf member access mechanism.

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This time with a comment noting that they work around a GCC2 compiler bug,
so some poor soul doesn't make the same mistake I did. Fixes the GCC2 KDLs
caused by my previous commits.
This commit is contained in:
Augustin Cavalier
2018-07-06 18:28:18 -04:00
parent 8101468dbf
commit 1b98805383
1 changed files with 15 additions and 7 deletions
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src/libs/compat/freebsd11_network/compat/sys/mbuf.h
+15 -7
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@@ -168,16 +168,24 @@ struct mbuf {
union { union {
struct { struct {
struct pkthdr m_pkthdr; /* M_PKTHDR set */ struct pkthdr MH_pkthdr;
union { union {
struct m_ext m_ext; /* M_EXT set */ struct m_ext MH_ext;
char m_pktdat[0]; char MH_databuf[0];
}; } MH_dat;
}; } MH;
char m_dat[0]; /* !M_PKTHDR, !M_EXT */ char M_databuf[0];
}; } M_dat;
}; };
/* The reason we use these really nasty macros, instead of naming the
* structs and unions properly like FreeBSD does ... is because of a
* GCC2 compiler bug. Specifically a parser bug: adding -O0 has no
* effect on this problem. */
#define m_pkthdr M_dat.MH.MH_pkthdr
#define m_ext M_dat.MH.MH_dat.MH_ext
#define m_pktdat M_dat.MH.MH_dat.MH_databuf
#define m_dat M_dat.M_databuf
void m_catpkt(struct mbuf *m, struct mbuf *n); void m_catpkt(struct mbuf *m, struct mbuf *n);
void m_adj(struct mbuf*, int); void m_adj(struct mbuf*, int);