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47 lines
2.1 KiB
47 lines
2.1 KiB
# warn-on-use.m4 serial 5 |
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dnl Copyright (C) 2010-2017 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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# 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_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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dnl FIXME: gl_Symbol must be used unquoted until we can assume |
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dnl autoconf 2.64 or newer. |
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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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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) $gl_func;])], |
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[AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])]) |
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AS_VAR_IF(gl_Symbol, [yes], |
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[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1]) |
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dnl shortcut - if the raw declaration exists, then set a cache |
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dnl variable to allow skipping any later AC_CHECK_DECL efforts |
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eval ac_cv_have_decl_$gl_func=yes]) |
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AS_VAR_POPDEF([gl_Symbol])dnl |
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done |
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])
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