62 lines
2.8 KiB
Text
62 lines
2.8 KiB
Text
# warn-on-use.m4 serial 10
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dnl Copyright (C) 2010-2023 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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# gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES)
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# ---------------------------------------
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# If the module 'posixcheck' is in use:
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#
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# For each whitespace-separated element in the list of NAMES, define
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# HAVE_RAW_DECL_name if the function has a declaration among INCLUDES
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# even after being undefined as a macro.
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#
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# See warn-on-use.h for some hints on how to poison function names, as
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# well as ideas on poisoning global variables and macros. NAMES may
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# include global variables, but remember that only functions work with
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# _GL_WARN_ON_USE. Typically, INCLUDES only needs to list a single
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# header, but if the replacement header pulls in other headers because
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# some systems declare functions in the wrong header, then INCLUDES
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# should do likewise.
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#
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# It is generally safe to assume declarations for functions declared
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# in the intersection of C89 and C11 (such as printf) without
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# needing gl_WARN_ON_USE_PREPARE.
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AC_DEFUN([gl_WARN_ON_USE_PREPARE],
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[
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m4_ifdef([gl_POSIXCHECK],
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[m4_foreach_w([gl_decl], [$2],
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[AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])),
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[Define to 1 if ]m4_defn([gl_decl])[ is declared even after
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undefining macros.])])dnl
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for gl_func in m4_flatten([$2]); do
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AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl
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dnl As a workaround to implicit built-in function declarations in
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dnl clang (e.g. strndup), reference ac_compile_for_check_decl instead
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dnl of ac_compile. If, for whatever reason, the override of AC_PROG_CC
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dnl in zzgnulib.m4 is inactive, use the original ac_compile.
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ac_save_ac_compile="$ac_compile"
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if test -n "$ac_compile_for_check_decl"; then
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ac_compile="$ac_compile_for_check_decl"
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fi
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AC_CACHE_CHECK([whether $gl_func is declared without a macro],
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[gl_Symbol],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
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[[#undef $gl_func
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(void) $gl_func;]])],
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[AS_VAR_SET([gl_Symbol], [yes])], [AS_VAR_SET([gl_Symbol], [no])])])
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ac_compile="$ac_save_ac_compile"
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AS_VAR_IF([gl_Symbol], [yes],
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[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
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dnl Shortcut for an AC_CHECK_DECL invocation that may come later:
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dnl If the raw declaration exists with the given includes, then
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dnl AC_CHECK_DECL with its many includes would see it as well.
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dnl So, set a cache variable to allow skipping any later
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dnl AC_CHECK_DECL invocation for $gl_func.
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eval "ac_cv_have_decl_$gl_func=yes"
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])
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AS_VAR_POPDEF([gl_Symbol])dnl
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done
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])
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])
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