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>

Description:
C99 functions for transcendental functions with long double arguments.

Files:

Depends-on:
floorl
ceill
acosl
asinl
atanl
cosl
expl
logl
sinl
sqrtl
tanl

configure.ac:
AC_REQUIRE([gl_FUNC_FLOORL])
AC_REQUIRE([gl_FUNC_CEILL])
AC_REQUIRE([gl_FUNC_ACOSL])
AC_REQUIRE([gl_FUNC_ASINL])
AC_REQUIRE([gl_FUNC_ATANL])
AC_REQUIRE([gl_FUNC_COSL])
AC_REQUIRE([gl_FUNC_EXPL])
AC_REQUIRE([gl_FUNC_LOGL])
AC_REQUIRE([gl_FUNC_SINL])
AC_REQUIRE([gl_FUNC_SQRTL])
AC_REQUIRE([gl_FUNC_TANL])
LIBS="$LIBS $FLOORL_LIBM $CEILL_LIBM $ACOSL_LIBM $ASINL_LIBM $ATANL_LIBM $ACOSL_LIBM $EXPL_LIBM $LOGL_LIBM $SINL_LIBM $SQRTL_LIBM $TANL_LIBM"

Makefile.am:

Include:
<math.h>

License:
GPL

Maintainer:
Paolo Bonzini  <bonzini@gnu.org>