Separate the module 'waitpid' from the module 'sys_wait'. * lib/sys_wait.in.h (waitpid): Declare only if the 'waitpid' module is present. * m4/sys_wait_h.m4 (gl_SYS_WAIT_MODULE_INDICATOR): Invoke gl_MODULE_INDICATOR_FOR_TESTS. (gl_SYS_WAIT_H_DEFAULTS): Initialize GNULIB_WAITPID. * modules/sys_wait (Depends-on): Remove waitpid. (Makefile.am): Substitute GNULIB_WAITPID. * modules/waitpid (configure.ac): Invoke gl_SYS_WAIT_MODULE_INDICATOR. * tests/test-sys_wait-c++.cc (GNULIB_NAMESPACE::waitpid): Check the signature only if the 'waitpid' module is present. * doc/posix-functions/waitpid.texi: Mention the 'waitpid' module. * NEWS: Mention the change. * modules/grantpt (Depends-on): Add waitpid. * modules/wait-process (Depends-on): Likewise.

Files:
tests/test-tsearch.sh
tests/test-tsearch.c
tests/signature.h

Depends-on:
stdint

configure.ac:
TEST_TSEARCH_LIBM=
AC_LINK_IFELSE(
  [AC_LANG_PROGRAM(
     [[#ifndef __NO_MATH_INLINES
       # define __NO_MATH_INLINES 1 /* for glibc */
       #endif
       #include <math.h>
       double x;]],
     [[x = log (x);]])],
  [],
  [TEST_TSEARCH_LIBM=-lm])
AC_SUBST([TEST_TSEARCH_LIBM])
AC_CHECK_FUNCS_ONCE([initstate])

Makefile.am:
TESTS += test-tsearch.sh
check_PROGRAMS += test-tsearch
test_tsearch_LDADD = $(LDADD) @TEST_TSEARCH_LIBM@