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build support for detecting clock_gettime, with -lrt if needed

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* acinclude.m4 (gl_CLOCK_TIME):
* configure.ac: Locally include gl_CLOCK_TIME.  To be fixed properly
  when gnulib updates their license to reflect the actual BSD state of
  things.
* libguile/Makefile.am (libguile_@GUILE_EFFECTIVE_VERSION@_la_LDFLAGS):
  Add -lrt for clock_gettime, if needed.
* meta/guile-2.0-uninstalled.pc.in:
* meta/guile-2.0.pc.in: Likewise, in Libs.private.
This commit is contained in:
Andy Wingo 2011-05-04 20:16:55 +02:00
commit e3b8bce8f4
5 changed files with 38 additions and 2 deletions
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32
acinclude.m4
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@ -502,3 +502,35 @@ AC_DEFUN([GUILE_LIBUNISTRING_WITH_ICONV_SUPPORT], [
dnl Declare file $1 to be a script that needs configuring,
dnl and arrange to make it executable in the process.
AC_DEFUN([GUILE_CONFIG_SCRIPT],[AC_CONFIG_FILES([$1],[chmod +x $1])])
# clock_time.m4 serial 10
dnl Copyright (C) 2002-2006, 2009-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Check for clock_gettime and clock_settime, and set LIB_CLOCK_GETTIME.
# For a program named, say foo, you should add a line like the following
# in the corresponding Makefile.am file:
# foo_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
AC_DEFUN([gl_CLOCK_TIME],
[
dnl Persuade glibc and Solaris <time.h> to declare these functions.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
# Solaris 2.5.1 needs -lposix4 to get the clock_gettime function.
# Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
# Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all*
# programs in the package would end up linked with that potentially-shared
# library, inducing unnecessary run-time overhead.
LIB_CLOCK_GETTIME=
AC_SUBST([LIB_CLOCK_GETTIME])
gl_saved_libs=$LIBS
AC_SEARCH_LIBS([clock_gettime], [rt posix4],
[test "$ac_cv_search_clock_gettime" = "none required" ||
LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
AC_CHECK_FUNCS([clock_gettime clock_settime])
LIBS=$gl_saved_libs
])