diff options
Diffstat (limited to 'gnulib/m4/logl.m4')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/m4/logl.m4 | 75 |
2 files changed, 75 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 4fc10daa05477586fea99b6b3ca02a87d1102fa diff --git a/gnulib/m4/logl.m4 b/gnulib/m4/logl.m4 new file mode 100644 index 00000000..eab591e2 --- /dev/null +++ b/gnulib/m4/logl.m4 @@ -0,0 +1,75 @@ +# logl.m4 serial 2 +dnl Copyright (C) 2010 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_LOGL], +[ + AC_REQUIRE([gl_MATH_H_DEFAULTS]) + dnl Persuade glibc <math.h> to declare logl(). + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + LOGL_LIBM= + AC_CACHE_CHECK([whether logl() can be used without linking with libm], + [gl_cv_func_logl_no_libm], + [ + AC_TRY_LINK([#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + long double x;], + [return logl (x) > 1;], + [gl_cv_func_logl_no_libm=yes], + [gl_cv_func_logl_no_libm=no]) + ]) + if test $gl_cv_func_logl_no_libm = no; then + AC_CACHE_CHECK([whether logl() can be used with libm], + [gl_cv_func_logl_in_libm], + [ + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_TRY_LINK([#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + long double x;], + [return logl (x) > 1;], + [gl_cv_func_logl_in_libm=yes], + [gl_cv_func_logl_in_libm=no]) + LIBS="$save_LIBS" + ]) + if test $gl_cv_func_logl_in_libm = yes; then + LOGL_LIBM=-lm + fi + fi + if test $gl_cv_func_logl_no_libm = yes \ + || test $gl_cv_func_logl_in_libm = yes; then + dnl Also check whether it's declared. + dnl MacOS X 10.3 has logl() in libc but doesn't declare it in <math.h>. + AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [#include <math.h>]) + else + HAVE_DECL_LOGL=0 + HAVE_LOGL=0 + AC_LIBOBJ([logl]) + AC_REQUIRE([gl_FUNC_FREXPL]) + AC_REQUIRE([gl_FUNC_ISNANL]) + AC_REQUIRE([gl_FUNC_FLOORL]) + dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates. + case " $LOGL_LIBM " in + *" $FREXPL_LIBM "*) ;; + *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;; + esac + dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates. + case " $LOGL_LIBM " in + *" $ISNANL_LIBM "*) ;; + *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;; + esac + dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates. + case " $LOGL_LIBM " in + *" $FLOORL_LIBM "*) ;; + *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;; + esac + fi + AC_SUBST([LOGL_LIBM]) +]) |