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regex: avoid glibc deadlock during configure glibc has a known bug where certain corruptions of the heap can cause malloc to default to printing a debug message that includes a backtrace, but the act of getting the backtrace uses dlopen which in turn calls into malloc, causing a recursive lock ending in deadlock. Thus, when configure is probing for a known glibc heap corruption bug, the overall configure would hang. The solution suggested by glibc developers is to force malloc to quit printing debug messages, which avoids recursive malloc. * m4/regex.m4 (gl_REGEX): Avoid recursive malloc deadlock when glibc bug 15078 in turn triggers bug 16159. Reported by Michal Privoznik. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 03 Dec 2013 10:34:13 -0700
parents af0e27b20c3a
children 14900a007cbc
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Description:
cosl() function: cosine function with long double argument.

Files:
lib/cosl.c
lib/trigl.h
lib/sincosl.c
lib/trigl.c
m4/cosl.m4

Depends-on:
math
extensions
cos             [test $HAVE_COSL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1]
float           [test $HAVE_COSL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
isnanl          [test $HAVE_COSL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
floor           [test $HAVE_COSL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
floorl          [test $HAVE_COSL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]

configure.ac:
gl_FUNC_COSL
if test $HAVE_COSL = 0; then
  AC_LIBOBJ([cosl])
  if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0; then
    AC_LIBOBJ([sincosl])
    AC_LIBOBJ([trigl])
  fi
fi
gl_MATH_MODULE_INDICATOR([cosl])

Makefile.am:

Include:
<math.h>

Link:
$(ACOSL_LIBM)

License:
LGPL

Maintainer:
Paolo Bonzini