diff options
Diffstat (limited to 'm4/stdarg.m4')
| -rw-r--r-- | m4/stdarg.m4 | 72 |
1 files changed, 55 insertions, 17 deletions
diff --git a/m4/stdarg.m4 b/m4/stdarg.m4 index e8e680a..ab3e7f5 100644 --- a/m4/stdarg.m4 +++ b/m4/stdarg.m4 @@ -1,5 +1,5 @@ -# stdarg.m4 serial 1 -dnl Copyright (C) 2006 Free Software Foundation, Inc. +# stdarg.m4 serial 6 +dnl Copyright (C) 2006, 2008-2016 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. @@ -9,32 +9,70 @@ dnl Provide a working va_copy in combination with <stdarg.h>. AC_DEFUN([gl_STDARG_H], [ + STDARG_H='' + NEXT_STDARG_H='<stdarg.h>' AC_MSG_CHECKING([for va_copy]) AC_CACHE_VAL([gl_cv_func_va_copy], [ - AC_TRY_COMPILE([#include <stdarg.h>], [ + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdarg.h>]], + [[ #ifndef va_copy void (*func) (va_list, va_list) = va_copy; #endif -], - [gl_cv_func_va_copy=yes], [gl_cv_func_va_copy=no])]) + ]])], + [gl_cv_func_va_copy=yes], + [gl_cv_func_va_copy=no])]) AC_MSG_RESULT([$gl_cv_func_va_copy]) if test $gl_cv_func_va_copy = no; then - # Provide a substitute, either __va_copy or as a simple assignment. - AC_CACHE_VAL([gl_cv_func___va_copy], [ - AC_TRY_COMPILE([#include <stdarg.h>], [ + dnl Provide a substitute. + dnl Usually a simple definition in <config.h> is enough. Not so on AIX 5 + dnl with some versions of the /usr/vac/bin/cc compiler. It has an <stdarg.h> + dnl which does '#undef va_copy', leading to a missing va_copy symbol. For + dnl this platform, we use an <stdarg.h> substitute. But we cannot use this + dnl approach on other platforms, because <stdarg.h> often defines only + dnl preprocessor macros and gl_ABSOLUTE_HEADER, gl_CHECK_NEXT_HEADERS do + dnl not work in this situation. + AC_EGREP_CPP([vaccine], + [#if defined _AIX && !defined __GNUC__ + AIX vaccine + #endif + ], [gl_aixcc=yes], [gl_aixcc=no]) + if test $gl_aixcc = yes; then + dnl Provide a substitute <stdarg.h> file. + STDARG_H=stdarg.h + gl_NEXT_HEADERS([stdarg.h]) + dnl Fallback for the case when <stdarg.h> contains only macro definitions. + if test "$gl_cv_next_stdarg_h" = '""'; then + gl_cv_next_stdarg_h='"///usr/include/stdarg.h"' + NEXT_STDARG_H="$gl_cv_next_stdarg_h" + fi + else + dnl Provide a substitute in <config.h>, either __va_copy or as a simple + dnl assignment. + gl_CACHE_VAL_SILENT([gl_cv_func___va_copy], [ + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdarg.h>]], + [[ #ifndef __va_copy error, bail out #endif -], - [gl_cv_func___va_copy=yes], [gl_cv_func___va_copy=no])]) - if test $gl_cv_func___va_copy = yes; then - AC_DEFINE([va_copy], [__va_copy], - [Define as a macro for copying va_list variables.]) - else - AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */ + ]])], + [gl_cv_func___va_copy=yes], + [gl_cv_func___va_copy=no])]) + if test $gl_cv_func___va_copy = yes; then + AC_DEFINE([va_copy], [__va_copy], + [Define as a macro for copying va_list variables.]) + else + AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */ #define gl_va_copy(a,b) ((a) = (b))]) - AC_DEFINE([va_copy], [gl_va_copy], - [Define as a macro for copying va_list variables.]) + AC_DEFINE([va_copy], [gl_va_copy], + [Define as a macro for copying va_list variables.]) + fi fi fi + AC_SUBST([STDARG_H]) + AM_CONDITIONAL([GL_GENERATE_STDARG_H], [test -n "$STDARG_H"]) + AC_SUBST([NEXT_STDARG_H]) ]) |