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43 lines
1.1 KiB
43 lines
1.1 KiB
15 years ago
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dnl See whether we need a declaration for a function.
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dnl GCC_NEED_DECLARATION(FUNCTION [, EXTRA-HEADER-FILES])
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AC_DEFUN(GCC_NEED_DECLARATION,
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[AC_MSG_CHECKING([whether $1 must be declared])
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AC_CACHE_VAL(gcc_cv_decl_needed_$1,
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[AC_TRY_COMPILE([
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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$2],
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[char *(*pfn) = (char *(*)) $1],
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eval "gcc_cv_decl_needed_$1=no", eval "gcc_cv_decl_needed_$1=yes")])
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if eval "test \"`echo '$gcc_cv_decl_needed_'$1`\" = yes"; then
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AC_MSG_RESULT(yes)
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gcc_need_declarations="$gcc_need_declarations $1"
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gcc_tr_decl=NEED_DECLARATION_`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
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AC_DEFINE_UNQUOTED($gcc_tr_decl)
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else
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AC_MSG_RESULT(no)
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fi
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])dnl
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dnl Check multiple functions to see whether each needs a declaration.
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dnl GCC_NEED_DECLARATIONS(FUNCTION... [, EXTRA-HEADER-FILES])
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AC_DEFUN(GCC_NEED_DECLARATIONS,
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[for ac_func in $1
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do
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GCC_NEED_DECLARATION($ac_func, $2)
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done
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]
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)
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