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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 17:39:29 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 17:39:29 +0000 |
| commit | 8ffec2a3aba6f114784e11f89ef1d57a096ae540 (patch) | |
| tree | ccebcbad06203e8241a8e7249f8e6c478a3682ea /m4/ldexp.m4 | |
| parent | Initial commit. (diff) | |
| download | coreutils-8ffec2a3aba6f114784e11f89ef1d57a096ae540.tar.xz coreutils-8ffec2a3aba6f114784e11f89ef1d57a096ae540.zip | |
Adding upstream version 8.32.upstream/8.32upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'm4/ldexp.m4')
| -rw-r--r-- | m4/ldexp.m4 | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/m4/ldexp.m4 b/m4/ldexp.m4 new file mode 100644 index 0000000..d73dcab --- /dev/null +++ b/m4/ldexp.m4 @@ -0,0 +1,54 @@ +# ldexp.m4 serial 1 +dnl Copyright (C) 2010-2020 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_LDEXP], +[ + AC_REQUIRE([gl_CHECK_LDEXP_NO_LIBM]) + LDEXP_LIBM= + if test $gl_cv_func_ldexp_no_libm = no; then + AC_CACHE_CHECK([whether ldexp() can be used with libm], + [gl_cv_func_ldexp_in_libm], + [ + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + double (*funcptr) (double, int) = ldexp; + double x;]], + [[return ldexp (x, -1) > 0;]])], + [gl_cv_func_ldexp_in_libm=yes], + [gl_cv_func_ldexp_in_libm=no]) + LIBS="$save_LIBS" + ]) + if test $gl_cv_func_ldexp_in_libm = yes; then + LDEXP_LIBM=-lm + fi + fi + AC_SUBST([LDEXP_LIBM]) +]) + +dnl Test whether ldexp() can be used without linking with libm. +dnl Set gl_cv_func_ldexp_no_libm to 'yes' or 'no' accordingly. +AC_DEFUN([gl_CHECK_LDEXP_NO_LIBM], +[ + AC_CACHE_CHECK([whether ldexp() can be used without linking with libm], + [gl_cv_func_ldexp_no_libm], + [ + AC_LINK_IFELSE( + [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + double (*funcptr) (double, int) = ldexp; + double x;]], + [[return ldexp (x, -1) > 0;]])], + [gl_cv_func_ldexp_no_libm=yes], + [gl_cv_func_ldexp_no_libm=no]) + ]) +]) |