Mercurial > gnulib
view m4/hypot.m4 @ 40214:452ab00796c7
Fix undefined behaviour.
* lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to
'unsigned int', to avoid shift operations on 'int'.
* lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size.
* tests/test-count-leading-zeros.c (main): Use a random number that has
as many bits as TYPE, not only 2*15 or 2*31 bits.
* tests/test-count-trailing-zeros.c (main): Likewise.
* tests/test-count-one-bits.c (main): Likewise.
* tests/test-memmem.c: Don't include "null-ptr.h".
(main): Use zerosize_ptr() instead of null_ptr().
* modules/memmem-tests (Files): Remove tests/null-ptr.h.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 20:32:25 +0100 |
parents | e2e6dc79463b |
children |
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# hypot.m4 serial 7 dnl Copyright (C) 2012-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_HYPOT], [ m4_divert_text([DEFAULTS], [gl_hypot_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Persuade glibc <math.h> to declare hypot(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Determine HYPOT_LIBM. gl_COMMON_DOUBLE_MATHFUNC([hypot]) m4_ifdef([gl_FUNC_HYPOT_IEEE], [ if test $gl_hypot_required = ieee && test $REPLACE_HYPOT = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether hypot works according to ISO C 99 with IEC 60559], [gl_cv_func_hypot_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $HYPOT_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (double x, double y) { return x == y; } static double dummy (double x, double y) { return 0; } double zero; double one = 1.0; int main (int argc, char *argv[]) { double (* volatile my_hypot) (double, double) = argc ? hypot : dummy; double f; /* Test hypot(NaN,Infinity). This test fails on OSF/1 5.1 and native Windows. */ f = my_hypot (zero / zero, one / zero); if (!numeric_equal (f, f)) return 1; return 0; } ]])], [gl_cv_func_hypot_ieee=yes], [gl_cv_func_hypot_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_hypot_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_hypot_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_hypot_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_hypot_ieee" in *yes) ;; *) REPLACE_HYPOT=1 ;; esac fi ]) if test $REPLACE_HYPOT = 1; then dnl Find libraries needed to link lib/hypot.c. AC_REQUIRE([gl_FUNC_FABS]) AC_REQUIRE([gl_FUNC_FREXP]) AC_REQUIRE([gl_FUNC_LDEXP]) AC_REQUIRE([gl_FUNC_SQRT]) HYPOT_LIBM= dnl Append $FABS_LIBM to HYPOT_LIBM, avoiding gratuitous duplicates. case " $HYPOT_LIBM " in *" $FABS_LIBM "*) ;; *) HYPOT_LIBM="$HYPOT_LIBM $FABS_LIBM" ;; esac dnl Append $FREXP_LIBM to HYPOT_LIBM, avoiding gratuitous duplicates. case " $HYPOT_LIBM " in *" $FREXP_LIBM "*) ;; *) HYPOT_LIBM="$HYPOT_LIBM $FREXP_LIBM" ;; esac dnl Append $LDEXP_LIBM to HYPOT_LIBM, avoiding gratuitous duplicates. case " $HYPOT_LIBM " in *" $LDEXP_LIBM "*) ;; *) HYPOT_LIBM="$HYPOT_LIBM $LDEXP_LIBM" ;; esac dnl Append $SQRT_LIBM to HYPOT_LIBM, avoiding gratuitous duplicates. case " $HYPOT_LIBM " in *" $SQRT_LIBM "*) ;; *) HYPOT_LIBM="$HYPOT_LIBM $SQRT_LIBM" ;; esac fi ])