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-rw-r--r--gl/m4/warn-on-use.m461
1 files changed, 38 insertions, 23 deletions
diff --git a/gl/m4/warn-on-use.m4 b/gl/m4/warn-on-use.m4
index e43beeb..10649c5 100644
--- a/gl/m4/warn-on-use.m4
+++ b/gl/m4/warn-on-use.m4
@@ -1,11 +1,13 @@
1# warn-on-use.m4 serial 5 1# warn-on-use.m4 serial 10
2dnl Copyright (C) 2010-2013 Free Software Foundation, Inc. 2dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation 3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it, 4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved. 5dnl 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# If the module 'posixcheck' is in use:
10#
9# For each whitespace-separated element in the list of NAMES, define 11# For each whitespace-separated element in the list of NAMES, define
10# HAVE_RAW_DECL_name if the function has a declaration among INCLUDES 12# HAVE_RAW_DECL_name if the function has a declaration among INCLUDES
11# even after being undefined as a macro. 13# even after being undefined as a macro.
@@ -23,25 +25,38 @@ dnl with or without modifications, as long as this notice is preserved.
23# needing gl_WARN_ON_USE_PREPARE. 25# needing gl_WARN_ON_USE_PREPARE.
24AC_DEFUN([gl_WARN_ON_USE_PREPARE], 26AC_DEFUN([gl_WARN_ON_USE_PREPARE],
25[ 27[
26 m4_foreach_w([gl_decl], [$2], 28 m4_ifdef([gl_POSIXCHECK],
27 [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])), 29 [m4_foreach_w([gl_decl], [$2],
28 [Define to 1 if ]m4_defn([gl_decl])[ is declared even after 30 [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])),
29 undefining macros.])])dnl 31 [Define to 1 if ]m4_defn([gl_decl])[ is declared even after
30dnl FIXME: gl_Symbol must be used unquoted until we can assume 32 undefining macros.])])dnl
31dnl autoconf 2.64 or newer. 33 for gl_func in m4_flatten([$2]); do
32 for gl_func in m4_flatten([$2]); do 34 AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl
33 AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl 35 dnl As a workaround to implicit built-in function declarations in
34 AC_CACHE_CHECK([whether $gl_func is declared without a macro], 36 dnl clang (e.g. strndup), reference ac_compile_for_check_decl instead
35 gl_Symbol, 37 dnl of ac_compile. If, for whatever reason, the override of AC_PROG_CC
36 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1], 38 dnl in zzgnulib.m4 is inactive, use the original ac_compile.
37[@%:@undef $gl_func 39 ac_save_ac_compile="$ac_compile"
38 (void) $gl_func;])], 40 if test -n "$ac_compile_for_check_decl"; then
39 [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])]) 41 ac_compile="$ac_compile_for_check_decl"
40 AS_VAR_IF(gl_Symbol, [yes], 42 fi
41 [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1]) 43 AC_CACHE_CHECK([whether $gl_func is declared without a macro],
42 dnl shortcut - if the raw declaration exists, then set a cache 44 [gl_Symbol],
43 dnl variable to allow skipping any later AC_CHECK_DECL efforts 45 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
44 eval ac_cv_have_decl_$gl_func=yes]) 46[[#undef $gl_func
45 AS_VAR_POPDEF([gl_Symbol])dnl 47 (void) $gl_func;]])],
46 done 48 [AS_VAR_SET([gl_Symbol], [yes])], [AS_VAR_SET([gl_Symbol], [no])])])
49 ac_compile="$ac_save_ac_compile"
50 AS_VAR_IF([gl_Symbol], [yes],
51 [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
52 dnl Shortcut for an AC_CHECK_DECL invocation that may come later:
53 dnl If the raw declaration exists with the given includes, then
54 dnl AC_CHECK_DECL with its many includes would see it as well.
55 dnl So, set a cache variable to allow skipping any later
56 dnl AC_CHECK_DECL invocation for $gl_func.
57 eval "ac_cv_have_decl_$gl_func=yes"
58 ])
59 AS_VAR_POPDEF([gl_Symbol])dnl
60 done
61 ])
47]) 62])