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https://src.fedoraproject.org/rpms/unuran/blob/4e6e6392ad892454339458b655fd0324e58de3b7/f/unuran-configure-c99.patch
https://bugzilla.redhat.com/show_bug.cgi?id=2150308
Avoid calling the undeclared exit function. Instead return
from main. Implicit function declarations were removed from C99,
and future compilers are likely to reject them.
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -14,7 +14,7 @@ int main (void)
nan = inf / inf;
/* nan = 0.0 / 0.0; */
status = (nan == nan);
- exit (status);
+ return status;
}]])],
[ac_cv_c_ieee_comparisons="yes"],
[ac_cv_c_ieee_comparisons="no"],
@@ -43,7 +43,7 @@ int main (void)
double x = 0.0;
double inf = 1.0 / x;
int status = (inf < DBL_MAX/2.);
- exit (status);
+ return status;
}]])],
[ac_cv_c_divide_by_zero="yes"],
[ac_cv_c_divide_by_zero="no"],
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