77 lines
2.7 KiB
Plaintext
77 lines
2.7 KiB
Plaintext
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# stdarg.m4 serial 8
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dnl Copyright (C) 2006, 2008-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Bruno Haible.
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dnl Provide a working va_copy in combination with <stdarg.h>.
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AC_DEFUN([gl_STDARG_H],
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[
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GL_GENERATE_STDARG_H=false
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NEXT_STDARG_H='<stdarg.h>'
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AC_CACHE_CHECK([for va_copy],
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[gl_cv_func_va_copy],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdarg.h>]],
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[[
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#ifndef va_copy
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void (*func) (va_list, va_list) = va_copy;
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#endif
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]])],
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[gl_cv_func_va_copy=yes],
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[gl_cv_func_va_copy=no])
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])
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if test $gl_cv_func_va_copy = no; then
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dnl Provide a substitute.
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dnl Usually a simple definition in <config.h> is enough. Not so on AIX 5
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dnl with some versions of the /usr/vac/bin/cc compiler. It has an <stdarg.h>
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dnl which does '#undef va_copy', leading to a missing va_copy symbol. For
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dnl this platform, we use an <stdarg.h> substitute. But we cannot use this
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dnl approach on other platforms, because <stdarg.h> often defines only
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dnl preprocessor macros and gl_ABSOLUTE_HEADER, gl_CHECK_NEXT_HEADERS do
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dnl not work in this situation.
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AC_EGREP_CPP([vaccine],
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[#if defined _AIX && !defined __GNUC__
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AIX vaccine
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#endif
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], [gl_aixcc=yes], [gl_aixcc=no])
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if test $gl_aixcc = yes; then
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dnl Provide a substitute <stdarg.h> file.
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GL_GENERATE_STDARG_H=true
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gl_NEXT_HEADERS([stdarg.h])
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dnl Fallback for the case when <stdarg.h> contains only macro definitions.
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if test "$gl_cv_next_stdarg_h" = '""'; then
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gl_cv_next_stdarg_h='"///usr/include/stdarg.h"'
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NEXT_STDARG_H="$gl_cv_next_stdarg_h"
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fi
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else
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dnl Provide a substitute in <config.h>, either __va_copy or as a simple
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dnl assignment.
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gl_CACHE_VAL_SILENT([gl_cv_func___va_copy], [
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdarg.h>]],
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[[
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#ifndef __va_copy
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error, bail out
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#endif
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]])],
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[gl_cv_func___va_copy=yes],
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[gl_cv_func___va_copy=no])])
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if test $gl_cv_func___va_copy = yes; then
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AC_DEFINE([va_copy], [__va_copy],
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[Define as a macro for copying va_list variables.])
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else
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AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */
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#define gl_va_copy(a,b) ((a) = (b))])
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AC_DEFINE([va_copy], [gl_va_copy],
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[Define as a macro for copying va_list variables.])
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fi
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fi
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fi
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AC_SUBST([NEXT_STDARG_H])
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])
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