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* configure.ac (_setjmp, _longjmp): Check by compiling

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instead of by guessing.  The guesses were wrong for
recent versions of Solaris, such as Solaris 11.
This commit is contained in:
Paul Eggert 2012-09-03 23:25:44 -07:00
parent 6578b4d842
commit 7b6c362efe
2 changed files with 24 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2012-09-04 Paul Eggert <eggert@cs.ucla.edu>
* configure.ac (_setjmp, _longjmp): Check by compiling
instead of by guessing. The guesses were wrong for
recent versions of Solaris, such as Solaris 11.
2012-09-03 Paul Eggert <eggert@cs.ucla.edu>
* configure.ac (WARN_CFLAGS): Omit -Wjump-misses-init.

22
configure.ac
View File

@ -3791,13 +3791,27 @@ else
esac
fi dnl GCC?
AC_CACHE_CHECK([for _setjmp], [emacs_cv_func__setjmp],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <setjmp.h>
]],
[[jmp_buf j;
if (! _setjmp (j))
_longjmp (j, 1);]])],
[emacs_cv_func__setjmp=yes],
[emacs_cv_func__setjmp=no])])
if test $emacs_cv_func__setjmp = no; then
AC_DEFINE([_setjmp], [setjmp],
[Define to setjmp if _setjmp and _longjmp do not work. See _longjmp.])
AC_DEFINE([_longjmp], [longjmp],
[Define to longjmp if _setjmp and _longjmp do not work.
Because longjmp may alter signal masks, callers of _longjmp
should not assume that it leaves signal masks alone.])
fi
case $opsys in
sol2* | unixware )
dnl setjmp and longjmp can safely replace _setjmp and _longjmp,
dnl but they will run more slowly.
AC_DEFINE(_setjmp, setjmp, [Some platforms redefine this.])
AC_DEFINE(_longjmp, longjmp, [Some platforms redefine this.])
dnl TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
dnl subprocesses the usual way. But TIOCSIGNAL does work for PTYs,
dnl and this is all we need.