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Diffstat (limited to 'gnulib/m4/truncl.m4')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/m4/truncl.m4 | 124 |
2 files changed, 124 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/m4/truncl.m4 b/gnulib/m4/truncl.m4 new file mode 100644 index 0000000..c4a9971 --- /dev/null +++ b/gnulib/m4/truncl.m4 @@ -0,0 +1,124 @@ +# truncl.m4 serial 10 +dnl Copyright (C) 2007-2008, 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_TRUNCL], +[ + m4_divert_text([DEFAULTS], [gl_truncl_required=plain]) + AC_REQUIRE([gl_MATH_H_DEFAULTS]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + + dnl Persuade glibc <math.h> to declare truncl(). + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + dnl Test whether truncl() is declared. + AC_CHECK_DECLS([truncl], , , [[#include <math.h>]]) + if test "$ac_cv_have_decl_truncl" = yes; then + dnl Test whether truncl() can be used without libm. + TRUNCL_LIBM=? + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + long double x;]], + [[x = truncl(x);]])], + [TRUNCL_LIBM=]) + if test "$TRUNCL_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> + long double x;]], + [[x = truncl(x);]])], + [TRUNCL_LIBM="-lm"]) + LIBS="$save_LIBS" + fi + if test "$TRUNCL_LIBM" = "?"; then + TRUNCL_LIBM= + fi + dnl Test whether truncl() works. It crashes on OSF/1 4.0d. + save_LIBS="$LIBS" + LIBS="$LIBS $TRUNCL_LIBM" + AC_CACHE_CHECK([whether truncl works], [gl_cv_func_truncl_works], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <math.h> +long double x; +int main() +{ + x = truncl (0.0L); + return 0; +}]])], + [gl_cv_func_truncl_works=yes], + [gl_cv_func_truncl_works=no], + [case "$host_os" in + osf4*) gl_cv_func_truncl_works="guessing no";; + *) gl_cv_func_truncl_works="guessing yes";; + esac + ]) + ]) + LIBS="$save_LIBS" + case "$gl_cv_func_truncl_works" in + *yes) ;; + *) REPLACE_TRUNCL=1 ;; + esac + m4_ifdef([gl_FUNC_TRUNCL_IEEE], [ + if test $gl_truncl_required = ieee && test $REPLACE_TRUNCL = 0; then + AC_CACHE_CHECK([whether truncl works according to ISO C 99 with IEC 60559], + [gl_cv_func_truncl_ieee], + [ + save_LIBS="$LIBS" + LIBS="$LIBS $TRUNCL_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include <math.h> +]gl_LONG_DOUBLE_MINUS_ZERO_CODE[ +]gl_LONG_DOUBLE_SIGNBIT_CODE[ +static long double dummy (long double f) { return 0; } +int main (int argc, char *argv[]) +{ + long double (*my_truncl) (long double) = argc ? truncl : dummy; + /* Test whether truncl (-0.3L) is -0.0L. */ + if (signbitl (minus_zerol) && !signbitl (my_truncl (-0.3L))) + return 1; + return 0; +} + ]])], + [gl_cv_func_truncl_ieee=yes], + [gl_cv_func_truncl_ieee=no], + [gl_cv_func_truncl_ieee="guessing no"]) + LIBS="$save_LIBS" + ]) + case "$gl_cv_func_truncl_ieee" in + *yes) ;; + *) REPLACE_TRUNCL=1 ;; + esac + fi + ]) + else + HAVE_DECL_TRUNCL=0 + fi + if test $HAVE_DECL_TRUNCL = 0 || test $REPLACE_TRUNCL = 1; then + dnl Find libraries needed to link lib/truncl.c. + if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then + AC_REQUIRE([gl_FUNC_TRUNC]) + TRUNCL_LIBM="$TRUNC_LIBM" + else + TRUNCL_LIBM= + fi + fi + AC_SUBST([TRUNCL_LIBM]) +]) |