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src/libmain/stack.cc: fix 'ucontext' usage on glibc-2.26 

Build fails as:

$ make
  CXX    src/libmain/stack.o
src/libmain/stack.cc: In function 'void nix::sigsegvHandler(int, siginfo_t*, void*)':
src/libmain/stack.cc:21:21: error: 'ucontext' was not declared in this scope
     sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
                     ^~~~~~~~
src/libmain/stack.cc:21:21: note: suggested alternative: 'ucontext_t'
     sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
                     ^~~~~~~~
                     ucontext_t

It's caused by upstream rename:
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=251287734e89a52da3db682a8241eb6bccc050c9

which basically changes
    typedef struct ucontext {} ucontext_t;
to
    typedef struct ucontext_t {} ucontext_t;

The change uses ucontext_t.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
(cherry picked from commit c9857ef262)
This commit is contained in:
Sergei Trofimovich 2017-08-31 21:41:36 +01:00 committed by Eelco Dolstra
parent b3a616e860
commit 41352d50db
No known key found for this signature in database
GPG Key ID: 8170B4726D7198DE
1 changed files with 2 additions and 2 deletions
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4
src/libmain/stack.cc
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@ -20,9 +20,9 @@ static void sigsegvHandler(int signo, siginfo_t * info, void * ctx)
bool haveSP = true;
char * sp = 0;
#if defined(__x86_64__) && defined(REG_RSP)
sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
sp = (char *) ((ucontext_t *) ctx)->uc_mcontext.gregs[REG_RSP];
#elif defined(REG_ESP)
sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_ESP];
sp = (char *) ((ucontext_t *) ctx)->uc_mcontext.gregs[REG_ESP];
#else
haveSP = false;
#endif