| # warn-on-use.m4 serial 9 |
| dnl Copyright (C) 2010-2021 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| # gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES) |
| # --------------------------------------- |
| # If the module 'posixcheck' is in use: |
| # |
| # For each whitespace-separated element in the list of NAMES, define |
| # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES |
| # even after being undefined as a macro. |
| # |
| # See warn-on-use.h for some hints on how to poison function names, as |
| # well as ideas on poisoning global variables and macros. NAMES may |
| # include global variables, but remember that only functions work with |
| # _GL_WARN_ON_USE. Typically, INCLUDES only needs to list a single |
| # header, but if the replacement header pulls in other headers because |
| # some systems declare functions in the wrong header, then INCLUDES |
| # should do likewise. |
| # |
| # It is generally safe to assume declarations for functions declared |
| # in the intersection of C89 and C11 (such as printf) without |
| # needing gl_WARN_ON_USE_PREPARE. |
| AC_DEFUN([gl_WARN_ON_USE_PREPARE], |
| [ |
| m4_ifdef([gl_POSIXCHECK], |
| [m4_foreach_w([gl_decl], [$2], |
| [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])), |
| [Define to 1 if ]m4_defn([gl_decl])[ is declared even after |
| undefining macros.])])dnl |
| for gl_func in m4_flatten([$2]); do |
| AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl |
| AC_CACHE_CHECK([whether $gl_func is declared without a macro], |
| [gl_Symbol], |
| [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1], |
| [[#undef $gl_func |
| (void) $gl_func;]])], |
| [AS_VAR_SET([gl_Symbol], [yes])], [AS_VAR_SET([gl_Symbol], [no])])]) |
| AS_VAR_IF([gl_Symbol], [yes], |
| [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1]) |
| dnl shortcut - if the raw declaration exists, then set a cache |
| dnl variable to allow skipping any later AC_CHECK_DECL efforts |
| eval ac_cv_have_decl_$gl_func=yes]) |
| AS_VAR_POPDEF([gl_Symbol])dnl |
| done |
| ]) |
| ]) |