OLD | NEW |
1 # warn-on-use.m4 serial 2 | 1 # warn-on-use.m4 serial 5 |
2 dnl Copyright (C) 2010, 2011 Free Software Foundation, Inc. | 2 dnl Copyright (C) 2010-2012 Free Software Foundation, Inc. |
3 dnl This file is free software; the Free Software Foundation | 3 dnl This file is free software; the Free Software Foundation |
4 dnl gives unlimited permission to copy and/or distribute it, | 4 dnl gives unlimited permission to copy and/or distribute it, |
5 dnl with or without modifications, as long as this notice is preserved. | 5 dnl with or without modifications, as long as this notice is preserved. |
6 | 6 |
7 # gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES) | 7 # gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES) |
8 # --------------------------------------- | 8 # --------------------------------------- |
9 # For each whitespace-separated element in the list of NAMES, define | 9 # For each whitespace-separated element in the list of NAMES, define |
10 # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES | 10 # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES |
11 # even after being undefined as a macro. | 11 # even after being undefined as a macro. |
12 # | 12 # |
13 # See warn-on-use.h for some hints on how to poison function names, as | 13 # See warn-on-use.h for some hints on how to poison function names, as |
14 # well as ideas on poisoning global variables and macros. NAMES may | 14 # well as ideas on poisoning global variables and macros. NAMES may |
15 # include global variables, but remember that only functions work with | 15 # include global variables, but remember that only functions work with |
16 # _GL_WARN_ON_USE. Typically, INCLUDES only needs to list a single | 16 # _GL_WARN_ON_USE. Typically, INCLUDES only needs to list a single |
17 # header, but if the replacement header pulls in other headers because | 17 # header, but if the replacement header pulls in other headers because |
18 # some systems declare functions in the wrong header, then INCLUDES | 18 # some systems declare functions in the wrong header, then INCLUDES |
19 # should do likewise. | 19 # should do likewise. |
20 # | 20 # |
21 # If you assume C89, then it is generally safe to assume declarations | 21 # It is generally safe to assume declarations for functions declared |
22 # for functions declared in that standard (such as gets) without | 22 # in the intersection of C89 and C11 (such as printf) without |
23 # needing gl_WARN_ON_USE_PREPARE. | 23 # needing gl_WARN_ON_USE_PREPARE. |
24 AC_DEFUN([gl_WARN_ON_USE_PREPARE], | 24 AC_DEFUN([gl_WARN_ON_USE_PREPARE], |
25 [ | 25 [ |
26 m4_foreach_w([gl_decl], [$2], | 26 m4_foreach_w([gl_decl], [$2], |
27 [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])), | 27 [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])), |
28 [Define to 1 if ]m4_defn([gl_decl])[ is declared even after | 28 [Define to 1 if ]m4_defn([gl_decl])[ is declared even after |
29 undefining macros.])])dnl | 29 undefining macros.])])dnl |
| 30 dnl FIXME: gl_Symbol must be used unquoted until we can assume |
| 31 dnl autoconf 2.64 or newer. |
30 for gl_func in m4_flatten([$2]); do | 32 for gl_func in m4_flatten([$2]); do |
31 AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl | 33 AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl |
32 AC_CACHE_CHECK([whether $gl_func is declared without a macro], | 34 AC_CACHE_CHECK([whether $gl_func is declared without a macro], |
33 gl_Symbol, | 35 gl_Symbol, |
34 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1], | 36 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1], |
35 [@%:@undef $gl_func | 37 [@%:@undef $gl_func |
36 (void) $gl_func;])], | 38 (void) $gl_func;])], |
37 [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])]) | 39 [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])]) |
38 AS_VAR_IF(gl_Symbol, [yes], | 40 AS_VAR_IF(gl_Symbol, [yes], |
39 [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1]) | 41 [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1]) |
40 dnl shortcut - if the raw declaration exists, then set a cache | 42 dnl shortcut - if the raw declaration exists, then set a cache |
41 dnl variable to allow skipping any later AC_CHECK_DECL efforts | 43 dnl variable to allow skipping any later AC_CHECK_DECL efforts |
42 eval ac_cv_have_decl_$gl_func=yes]) | 44 eval ac_cv_have_decl_$gl_func=yes]) |
43 AS_VAR_POPDEF([gl_Symbol])dnl | 45 AS_VAR_POPDEF([gl_Symbol])dnl |
44 done | 46 done |
45 ]) | 47 ]) |
OLD | NEW |