random: workaround old Cygwin bug

[Bruno Haible]

Althrough I don't want to spent time fixing normal bugs seen on old
Cygwin 1.5.25, this one is a compilation error:

../../gltests/test-random.c:22: warning: initialization from incompatible pointer type
../../gltests/test-random.c:23: error: `initstate' undeclared here (not in a function)
../../gltests/test-random.c:24: error: `setstate' undeclared here (not in a function)
../../gltests/test-random.c:25: warning: initialization from incompatible pointer type
../../gltests/test-random.c: In function `main':
../../gltests/test-random.c:38: warning: implicit declaration of function `initstate'
make[4]: *** [test-random.o] Error 1

Caused by missing declarations of initstate() and setstate() in /usr/include/cygwin/stdlib.h.

This patch fixes it.


2017-08-17 Bruno Haible <***@clisp.org>

random: Fix test compilation failure on Cygwin 1.5.25.
* m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize HAVE_DECL_INITSTATE,
HAVE_DECL_SETSTATE.
* m4/random.m4 (gl_FUNC_RANDOM): Test whether initstate and setstate are
declared.
* modules/stdlib (Makefile.am): Substitute HAVE_DECL_INITSTATE,
HAVE_DECL_SETSTATE.
* lib/stdlib.in.h (initstate): Declare also if HAVE_DECL_INITSTATE is 0.
(setstate): Declare also if HAVE_DECL_SETSTATE is 0.
* doc/posix-functions/initstate.texi: Mention the Cygwin 1.5.x problem.
* doc/posix-functions/random.texi: Likewise.
* doc/posix-functions/setstate.texi: Likewise.
* doc/posix-functions/srandom.texi: Likewise.

diff --git a/doc/posix-functions/initstate.texi b/doc/posix-functions/initstate.texi
index aca7e7b..0ddfebf 100644
--- a/doc/posix-functions/initstate.texi
+++ b/doc/posix-functions/initstate.texi
@@ -11,6 +11,9 @@ Portability problems fixed by Gnulib:
@item
This function is missing on some platforms:
Solaris 2.4, mingw, MSVC 14.
+@item
+This function is not declared on some platforms:
+Cygwin 1.5.25.
@end itemize

Portability problems not fixed by Gnulib:
diff --git a/doc/posix-functions/random.texi b/doc/posix-functions/random.texi
index 93093df..88d36f9 100644
--- a/doc/posix-functions/random.texi
+++ b/doc/posix-functions/random.texi
@@ -15,4 +15,8 @@ Solaris 2.4, mingw, MSVC 14.

Portability problems not fixed by Gnulib:
@itemize
+@item
+This function has a slightly incompatible declaration (the return type being
+@samp{int} instead of @samp{long}) on some platforms:
+Cygwin 1.5.25.
@end itemize
diff --git a/doc/posix-functions/setstate.texi b/doc/posix-functions/setstate.texi
index bc4a01e..2393574 100644
--- a/doc/posix-functions/setstate.texi
+++ b/doc/posix-functions/setstate.texi
@@ -11,6 +11,9 @@ Portability problems fixed by Gnulib:
@item
This function is missing on some platforms:
Solaris 2.4, mingw, MSVC 14.
+@item
+This function is not declared on some platforms:
+Cygwin 1.5.25.
@end itemize

Portability problems not fixed by Gnulib:
diff --git a/doc/posix-functions/srandom.texi b/doc/posix-functions/srandom.texi
index db0eaef..74770f7 100644
--- a/doc/posix-functions/srandom.texi
+++ b/doc/posix-functions/srandom.texi
@@ -15,4 +15,8 @@ Solaris 2.4, mingw, MSVC 14.

Portability problems not fixed by Gnulib:
@itemize
+@item
+This function has a slightly incompatible declaration (the return type being
+@samp{long} instead of @samp{void) on some platforms:
+Cygwin 1.5.25.
@end itemize
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index c6e68fd..ef41c99 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -597,7 +597,7 @@ _GL_WARN_ON_USE (srandom, "srandom is unportable - "
#endif

#if @GNULIB_RANDOM@
-# if !@HAVE_RANDOM@
+# if !@HAVE_RANDOM@ || !@HAVE_DECL_INITSTATE@
_GL_FUNCDECL_SYS (initstate, char *,
(unsigned int seed, char *buf, size_t buf_size)
_GL_ARG_NONNULL ((2)));
@@ -614,7 +614,7 @@ _GL_WARN_ON_USE (initstate, "initstate is unportable - "
#endif

#if @GNULIB_RANDOM@
-# if !@HAVE_RANDOM@
+# if !@HAVE_RANDOM@ || !@HAVE_DECL_SETSTATE@
_GL_FUNCDECL_SYS (setstate, char *, (char *arg_state) _GL_ARG_NONNULL ((1)));
# endif
_GL_CXXALIAS_SYS (setstate, char *, (char *arg_state));
diff --git a/m4/random.m4 b/m4/random.m4
index acd093d..f5cf0b5 100644
--- a/m4/random.m4
+++ b/m4/random.m4
@@ -1,4 +1,4 @@
-# random.m4 serial 1
+# random.m4 serial 2
dnl Copyright (C) 2012-2017 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -12,6 +12,16 @@ AC_DEFUN([gl_FUNC_RANDOM],
if test $ac_cv_func_random = no; then
HAVE_RANDOM=0
fi
+
+ AC_CHECK_DECLS_ONCE([initstate])
+ if test $ac_cv_have_decl_initstate = no; then
+ HAVE_DECL_INITSTATE=0
+ fi
+
+ AC_CHECK_DECLS_ONCE([setstate])
+ if test $ac_cv_have_decl_setstate = no; then
+ HAVE_DECL_SETSTATE=0
+ fi
])

# Prerequisites of lib/random.c.
diff --git a/m4/stdlib_h.m4 b/m4/stdlib_h.m4
index ec4a058..3537346 100644
--- a/m4/stdlib_h.m4
+++ b/m4/stdlib_h.m4
@@ -1,4 +1,4 @@
-# stdlib_h.m4 serial 43
+# stdlib_h.m4 serial 44
dnl Copyright (C) 2007-2017 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -78,6 +78,7 @@ AC_DEFUN([gl_STDLIB_H_DEFAULTS],
HAVE_DECL_GETLOADAVG=1; AC_SUBST([HAVE_DECL_GETLOADAVG])
HAVE_GETSUBOPT=1; AC_SUBST([HAVE_GETSUBOPT])
HAVE_GRANTPT=1; AC_SUBST([HAVE_GRANTPT])
+ HAVE_DECL_INITSTATE=1; AC_SUBST([HAVE_DECL_INITSTATE])
HAVE_MKDTEMP=1; AC_SUBST([HAVE_MKDTEMP])
HAVE_MKOSTEMP=1; AC_SUBST([HAVE_MKOSTEMP])
HAVE_MKOSTEMPS=1; AC_SUBST([HAVE_MKOSTEMPS])
@@ -96,6 +97,7 @@ AC_DEFUN([gl_STDLIB_H_DEFAULTS],
HAVE_SECURE_GETENV=1; AC_SUBST([HAVE_SECURE_GETENV])
HAVE_SETENV=1; AC_SUBST([HAVE_SETENV])
HAVE_DECL_SETENV=1; AC_SUBST([HAVE_DECL_SETENV])
+ HAVE_DECL_SETSTATE=1; AC_SUBST([HAVE_DECL_SETSTATE])
HAVE_STRTOD=1; AC_SUBST([HAVE_STRTOD])
HAVE_STRTOLL=1; AC_SUBST([HAVE_STRTOLL])
HAVE_STRTOULL=1; AC_SUBST([HAVE_STRTOULL])
diff --git a/modules/stdlib b/modules/stdlib
index 257b5db..62224e8 100644
--- a/modules/stdlib
+++ b/modules/stdlib
@@ -72,6 +72,7 @@ stdlib.h: stdlib.in.h $(top_builddir)/config.status $(CXXDEFS_H) \
-e 's|@''HAVE_DECL_GETLOADAVG''@|$(HAVE_DECL_GETLOADAVG)|g' \
-e 's|@''HAVE_GETSUBOPT''@|$(HAVE_GETSUBOPT)|g' \
-e 's|@''HAVE_GRANTPT''@|$(HAVE_GRANTPT)|g' \
+ -e 's|@''HAVE_DECL_INITSTATE''@|$(HAVE_DECL_INITSTATE)|g' \
-e 's|@''HAVE_MKDTEMP''@|$(HAVE_MKDTEMP)|g' \
-e 's|@''HAVE_MKOSTEMP''@|$(HAVE_MKOSTEMP)|g' \
-e 's|@''HAVE_MKOSTEMPS''@|$(HAVE_MKOSTEMPS)|g' \
@@ -89,6 +90,7 @@ stdlib.h: stdlib.in.h $(top_builddir)/config.status $(CXXDEFS_H) \
-e 's|@''HAVE_RPMATCH''@|$(HAVE_RPMATCH)|g' \
-e 's|@''HAVE_SECURE_GETENV''@|$(HAVE_SECURE_GETENV)|g' \
-e 's|@''HAVE_DECL_SETENV''@|$(HAVE_DECL_SETENV)|g' \
+ -e 's|@''HAVE_DECL_SETSTATE''@|$(HAVE_DECL_SETSTATE)|g' \
-e 's|@''HAVE_STRTOD''@|$(HAVE_STRTOD)|g' \
-e 's|@''HAVE_STRTOLL''@|$(HAVE_STRTOLL)|g' \
-e 's|@''HAVE_STRTOULL''@|$(HAVE_STRTOULL)|g' \