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author | Ludovic Courtès <ludo@gnu.org> | 2011-02-14 11:36:25 +0100 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2011-02-14 11:36:25 +0100 |
commit | 49114fd43de833c0724fbb0b6dc9ca639d1ab74f (patch) | |
tree | bd33e1612cbbc37218ff18a229ff603018d2d5d5 /m4/trunc.m4 | |
parent | d9a00aa53612b97b11847cfc03647a3ab54b2a48 (diff) | |
download | guile-49114fd43de833c0724fbb0b6dc9ca639d1ab74f.tar.gz |
Update Gnulib; add new modules.
This updates Gnulib to v0.0-4889-ge375fe3.
* m4/gnulib-cache.m4: Add `accept', `bind', `close', `connect',
`getpeername', `getsockname', `getsockopt', `listen', `malloc',
`malloca', `recv', `recvfrom', `send', `sendto', `setsockopt',
`shutdown', `socket', and `sockets', requested by
Jan Nieuwenhuizen <janneke-list@xs4all.nl> for cross-MinGW32 builds.
Add `trunc', requested by Mark H Weaver <mhw@netris.org>.
Diffstat (limited to 'm4/trunc.m4')
-rw-r--r-- | m4/trunc.m4 | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/m4/trunc.m4 b/m4/trunc.m4 new file mode 100644 index 000000000..e1069115c --- /dev/null +++ b/m4/trunc.m4 @@ -0,0 +1,86 @@ +# trunc.m4 serial 5 +dnl Copyright (C) 2007, 2010-2011 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_TRUNC], +[ + m4_divert_text([DEFAULTS], [gl_trunc_required=plain]) + AC_REQUIRE([gl_MATH_H_DEFAULTS]) + dnl Persuade glibc <math.h> to declare trunc(). + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + dnl Test whether trunc() is declared. + AC_CHECK_DECLS([trunc], , , [#include <math.h>]) + if test "$ac_cv_have_decl_trunc" = yes; then + dnl Test whether trunc() can be used without libm. + TRUNC_LIBM=? + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + double x;]], + [[x = trunc(x);]])], + [TRUNC_LIBM=]) + if test "$TRUNC_LIBM" = "?"; then + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + double x;]], + [[x = trunc(x);]])], + [TRUNC_LIBM="-lm"]) + LIBS="$save_LIBS" + fi + if test "$TRUNC_LIBM" = "?"; then + TRUNC_LIBM= + fi + m4_ifdef([gl_FUNC_TRUNC_IEEE], [ + if test $gl_trunc_required = ieee && test $REPLACE_TRUNC = 0; then + AC_CACHE_CHECK([whether trunc works according to ISO C 99 with IEC 60559], + [gl_cv_func_trunc_ieee], + [ + save_LIBS="$LIBS" + LIBS="$LIBS $TRUNC_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include <math.h> +]gl_DOUBLE_MINUS_ZERO_CODE[ +]gl_DOUBLE_SIGNBIT_CODE[ +int main() +{ + /* Test whether trunc (-0.0) is -0.0. */ + if (signbitd (minus_zerod) && !signbitd (trunc (minus_zerod))) + return 1; + return 0; +} + ]])], + [gl_cv_func_trunc_ieee=yes], + [gl_cv_func_trunc_ieee=no], + [gl_cv_func_trunc_ieee="guessing no"]) + LIBS="$save_LIBS" + ]) + case "$gl_cv_func_trunc_ieee" in + *yes) ;; + *) REPLACE_TRUNC=1 ;; + esac + fi + ]) + else + HAVE_DECL_TRUNC=0 + fi + if test $HAVE_DECL_TRUNC = 0 || test $REPLACE_TRUNC = 1; then + AC_LIBOBJ([trunc]) + TRUNC_LIBM= + fi + AC_SUBST([TRUNC_LIBM]) +]) |