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73 lines
2.5 KiB
Plaintext
73 lines
2.5 KiB
Plaintext
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dnl Check whether the target supports TLS.
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AC_DEFUN([LIBMUDFLAP_CHECK_TLS], [
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LIBMUDFLAP_ENABLE(tls, yes, [Use thread-local storage])
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AC_CACHE_CHECK([whether the target supports thread-local storage],
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have_tls, [
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AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
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[dnl If the test case passed with dynamic linking, try again with
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dnl static linking. This fails at least with some older Red Hat
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dnl releases.
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save_LDFLAGS="$LDFLAGS"
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LDFLAGS="-static $LDFLAGS"
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AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
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[have_tls=yes], [have_tls=no], [])
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LDFLAGS="$save_LDFLAGS"],
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[have_tls=no],
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[AC_COMPILE_IFELSE([__thread int foo;], [have_tls=yes], [have_tls=no])]
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)])
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if test "$enable_tls $have_tls" = "yes yes"; then
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AC_DEFINE(HAVE_TLS, 1,
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[Define to 1 if the target supports thread-local storage.])
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fi])
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dnl ----------------------------------------------------------------------
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dnl This whole bit snagged from libgfortran.
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sinclude(../libtool.m4)
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dnl The lines below arrange for aclocal not to bring an installed
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dnl libtool.m4 into aclocal.m4, while still arranging for automake to
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dnl add a definition of LIBTOOL to Makefile.in.
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ifelse(,,,[AC_SUBST(LIBTOOL)
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AC_DEFUN([AM_PROG_LIBTOOL])
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AC_DEFUN([AC_LIBTOOL_DLOPEN])
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AC_DEFUN([AC_PROG_LD])
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])
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dnl ----------------------------------------------------------------------
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dnl This whole bit snagged from libstdc++-v3.
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dnl
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dnl LIBMUDFLAP_ENABLE
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dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
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dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
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dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
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dnl
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dnl See docs/html/17_intro/configury.html#enable for documentation.
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dnl
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m4_define([LIBMUDFLAP_ENABLE],[dnl
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m4_define([_g_switch],[--enable-$1])dnl
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m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
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AC_ARG_ENABLE($1,_g_help,
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m4_bmatch([$5],
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[^permit ],
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[[
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case "$enableval" in
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m4_bpatsubst([$5],[permit ])) ;;
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*) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
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dnl Idea for future: generate a URL pointing to
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dnl "onlinedocs/configopts.html#whatever"
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esac
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]],
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[^$],
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[[
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case "$enableval" in
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yes|no) ;;
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*) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
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esac
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]],
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[[$5]]),
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[enable_]m4_bpatsubst([$1],-,_)[=][$2])
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m4_undefine([_g_switch])dnl
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m4_undefine([_g_help])dnl
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])
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