diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/configure.ac b/configure.ac index 382e62a97a1..f810c839587 100644 --- a/configure.ac +++ b/configure.ac @@ -3774,13 +3774,24 @@ AC_CACHE_CHECK([for _setjmp], [emacs_cv_func__setjmp], _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.]) +if test $emacs_cv_func__setjmp = yes; then + AC_DEFINE([HAVE__SETJMP], 1, [Define to 1 if _setjmp and _longjmp work.]) +else + AC_CACHE_CHECK([for sigsetjmp], [emacs_cv_func_sigsetjmp], + [AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <setjmp.h> + ]], + [[sigjmp_buf j; + if (! sigsetjmp (j, 1)) + siglongjmp (j, 1);]])], + [emacs_cv_func_sigsetjmp=yes], + [emacs_cv_func_sigsetjmp=no])]) + if test $emacs_cv_func_sigsetjmp = yes; then + AC_DEFINE([HAVE_SIGSETJMP], 1, + [Define to 1 if sigsetjmp and siglongjmp work. + The value of this symbol is irrelevant if HAVE__SETJMP is defined.]) + fi fi case $opsys in |