2018-01-20 02:14:59 -05:00
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# -*- Autoconf -*-
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2018-01-20 02:05:25 -05:00
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AC_DEFUN([RUBY_CHECK_PRINTF_PREFIX], [
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AC_CACHE_CHECK([for printf prefix for $1], [rb_cv_pri_prefix_]AS_TR_SH($1),[
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[rb_cv_pri_prefix_]AS_TR_SH($1)=[NONE]
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RUBY_WERROR_FLAG(RUBY_APPEND_OPTIONS(CFLAGS, $rb_cv_wsuppress_flags)
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for pri in $2; do
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AC_TRY_COMPILE(
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[@%:@include <stdio.h>
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@%:@include <stddef.h>
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@%:@ifdef __GNUC__
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@%:@define PRINTF_ARGS(decl, string_index, first_to_check) \
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decl __attribute__((format(printf, string_index, first_to_check)))
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@%:@else
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@%:@define PRINTF_ARGS(decl, string_index, first_to_check) decl
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@%:@endif
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PRINTF_ARGS(void test_sprintf(const char*, ...), 1, 2);],
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[printf("%]${pri}[d", (]$1[)42);
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test_sprintf("%]${pri}[d", (]$1[)42);],
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[rb_cv_pri_prefix_]AS_TR_SH($1)[=[$pri]; break])
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done)])
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AS_IF([test "[$rb_cv_pri_prefix_]AS_TR_SH($1)" != NONE], [
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AC_DEFINE_UNQUOTED([PRI_]m4_ifval($3,$3,AS_TR_CPP(m4_bpatsubst([$1],[_t$])))[_PREFIX],
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"[$rb_cv_pri_prefix_]AS_TR_SH($1)")
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])
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])dnl
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