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49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
# trunc.m4 serial 2
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dnl Copyright (C) 2007 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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AC_DEFUN([gl_FUNC_TRUNC],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Persuade glibc <math.h> to declare trunc().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether trunc() is declared.
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AC_CHECK_DECLS([trunc], , , [#include <math.h>])
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if test "$ac_cv_have_decl_trunc" = yes; then
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dnl Test whether trunc() can be used without libm.
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TRUNC_LIBM=?
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AC_TRY_LINK([
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double x;],
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[x = trunc(x);],
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[TRUNC_LIBM=])
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if test "$TRUNC_LIBM" = "?"; then
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save_LIBS="$LIBS"
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LIBS="$LIBS -lm"
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AC_TRY_LINK([
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double x;],
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[x = trunc(x);],
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[TRUNC_LIBM="-lm"])
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LIBS="$save_LIBS"
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fi
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if test "$TRUNC_LIBM" = "?"; then
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TRUNC_LIBM=
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fi
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else
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HAVE_DECL_TRUNC=0
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AC_LIBOBJ([trunc])
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TRUNC_LIBM=
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fi
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AC_SUBST([HAVE_DECL_TRUNC])
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AC_SUBST([TRUNC_LIBM])
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])
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