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7a6dbc2f SDJ |
1 | # warn-on-use.m4 serial 6 |
2 | dnl Copyright (C) 2010-2018 Free Software Foundation, Inc. | |
f434ba03 PA |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | # gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES) | |
8 | # --------------------------------------- | |
7a6dbc2f SDJ |
9 | # If the module 'posixcheck' is in use: |
10 | # | |
f434ba03 PA |
11 | # For each whitespace-separated element in the list of NAMES, define |
12 | # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES | |
13 | # even after being undefined as a macro. | |
14 | # | |
15 | # See warn-on-use.h for some hints on how to poison function names, as | |
16 | # well as ideas on poisoning global variables and macros. NAMES may | |
17 | # include global variables, but remember that only functions work with | |
18 | # _GL_WARN_ON_USE. Typically, INCLUDES only needs to list a single | |
19 | # header, but if the replacement header pulls in other headers because | |
20 | # some systems declare functions in the wrong header, then INCLUDES | |
21 | # should do likewise. | |
22 | # | |
770d76d7 PA |
23 | # It is generally safe to assume declarations for functions declared |
24 | # in the intersection of C89 and C11 (such as printf) without | |
f434ba03 PA |
25 | # needing gl_WARN_ON_USE_PREPARE. |
26 | AC_DEFUN([gl_WARN_ON_USE_PREPARE], | |
27 | [ | |
7a6dbc2f SDJ |
28 | m4_ifdef([gl_POSIXCHECK], |
29 | [m4_foreach_w([gl_decl], [$2], | |
30 | [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])), | |
31 | [Define to 1 if ]m4_defn([gl_decl])[ is declared even after | |
32 | undefining macros.])])dnl | |
770d76d7 PA |
33 | dnl FIXME: gl_Symbol must be used unquoted until we can assume |
34 | dnl autoconf 2.64 or newer. | |
7a6dbc2f SDJ |
35 | for gl_func in m4_flatten([$2]); do |
36 | AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl | |
37 | AC_CACHE_CHECK([whether $gl_func is declared without a macro], | |
38 | gl_Symbol, | |
39 | [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1], | |
f434ba03 PA |
40 | [@%:@undef $gl_func |
41 | (void) $gl_func;])], | |
7a6dbc2f SDJ |
42 | [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])]) |
43 | AS_VAR_IF(gl_Symbol, [yes], | |
44 | [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1]) | |
45 | dnl shortcut - if the raw declaration exists, then set a cache | |
46 | dnl variable to allow skipping any later AC_CHECK_DECL efforts | |
47 | eval ac_cv_have_decl_$gl_func=yes]) | |
48 | AS_VAR_POPDEF([gl_Symbol])dnl | |
49 | done | |
50 | ]) | |
f434ba03 | 51 | ]) |