diff options
Diffstat (limited to 'm4/stddef_h.m4')
| -rw-r--r-- | m4/stddef_h.m4 | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/m4/stddef_h.m4 b/m4/stddef_h.m4 index cd666c4a58c..1303d2e06c7 100644 --- a/m4/stddef_h.m4 +++ b/m4/stddef_h.m4 @@ -1,4 +1,4 @@ -# stddef_h.m4 serial 9 +# stddef_h.m4 serial 11 dnl Copyright (C) 2009-2021 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -6,7 +6,7 @@ dnl with or without modifications, as long as this notice is preserved. dnl A placeholder for <stddef.h>, for platforms that have issues. -AC_DEFUN([gl_STDDEF_H], +AC_DEFUN_ONCE([gl_STDDEF_H], [ AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) AC_REQUIRE([gt_TYPE_WCHAR_T]) @@ -68,13 +68,28 @@ AC_DEFUN([gl_STDDEF_H], fi ]) +# gl_STDDEF_MODULE_INDICATOR([modulename]) +# sets the shell variable that indicates the presence of the given module +# to a C preprocessor expression that will evaluate to 1. +# This macro invocation must not occur in macros that are AC_REQUIREd. AC_DEFUN([gl_STDDEF_MODULE_INDICATOR], [ - dnl Use AC_REQUIRE here, so that the default settings are expanded once only. - AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) + dnl Ensure to expand the default settings once only. + gl_STDDEF_H_REQUIRE_DEFAULTS gl_MODULE_INDICATOR_SET_VARIABLE([$1]) ]) +# Initializes the default values for AC_SUBSTed shell variables. +# This macro must not be AC_REQUIREd. It must only be invoked, and only +# outside of macros or in macros that are not AC_REQUIREd. +AC_DEFUN([gl_STDDEF_H_REQUIRE_DEFAULTS], +[ + m4_defun(GL_MODULE_INDICATOR_PREFIX[_STDDEF_H_MODULE_INDICATOR_DEFAULTS], [ + ]) + m4_require(GL_MODULE_INDICATOR_PREFIX[_STDDEF_H_MODULE_INDICATOR_DEFAULTS]) + AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) +]) + AC_DEFUN([gl_STDDEF_H_DEFAULTS], [ dnl Assume proper GNU behavior unless another module says otherwise. |