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New module 'exp2l'. * lib/math.in.h (exp2l): New declaration. * lib/exp2l.c: New file. * lib/expl-table.c: New file, extracted from lib/expl.c. * lib/expl.c (gl_expl_table): New declaration. (expl): Remove expl_table. Update reference. * m4/exp2l.m4: New file. * m4/math_h.m4 (gl_MATH_H): Test whether exp2l is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_EXP2L, HAVE_DECL_EXP2L. * modules/math (Makefile.am): Substitute GNULIB_EXP2L, HAVE_DECL_EXP2L. * modules/exp2l: New file. * modules/expl (Files): Add lib/expl-table.c. (configure.ac): Compile also expl-table.c. * tests/test-math-c++.cc: Check the declaration of exp2l. * doc/posix-functions/exp2l.texi: Mention the new module and the IRIX problem.
author Bruno Haible <bruno@clisp.org>
date Fri, 09 Mar 2012 01:13:40 +0100
parents
children d19d163c1519
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+# exp2l.m4 serial 1
+dnl Copyright (C) 2010-2012 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_EXP2L],
+[
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+  AC_REQUIRE([gl_FUNC_EXP2])
+
+  dnl Persuade glibc <math.h> to declare exp2l().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+  dnl Test whether exp2l() exists. Assume that exp2l(), if it exists, is
+  dnl defined in the same library as exp2().
+  save_LIBS="$LIBS"
+  LIBS="$LIBS $EXP2_LIBM"
+  AC_CHECK_FUNCS([exp2l])
+  LIBS="$save_LIBS"
+  if test $ac_cv_func_exp2l = yes; then
+    HAVE_EXP2L=1
+    EXP2L_LIBM="$EXP2_LIBM"
+    dnl Also check whether it's declared.
+    dnl IRIX 6.5 has exp2l() in libm but doesn't declare it in <math.h>.
+    AC_CHECK_DECL([exp2l], , [HAVE_DECL_EXP2L=0], [[#include <math.h>]])
+  else
+    HAVE_EXP2L=0
+    HAVE_DECL_EXP2L=0
+    dnl Find libraries needed to link lib/exp2l.c.
+    if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+      EXP2L_LIBM="$EXP2_LIBM"
+    else
+      AC_REQUIRE([gl_FUNC_ISNANL])
+      AC_REQUIRE([gl_FUNC_ROUNDL])
+      AC_REQUIRE([gl_FUNC_LDEXPL])
+      EXP2L_LIBM=
+      dnl Append $ISNANL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
+      case " $EXP2L_LIBM " in
+        *" $ISNANL_LIBM "*) ;;
+        *) EXP2L_LIBM="$EXP2L_LIBM $ISNANL_LIBM" ;;
+      esac
+      dnl Append $ROUNDL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
+      case " $EXP2L_LIBM " in
+        *" $ROUNDL_LIBM "*) ;;
+        *) EXP2L_LIBM="$EXP2L_LIBM $ROUNDL_LIBM" ;;
+      esac
+      dnl Append $LDEXPL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
+      case " $EXP2L_LIBM " in
+        *" $LDEXPL_LIBM "*) ;;
+        *) EXP2L_LIBM="$EXP2L_LIBM $LDEXPL_LIBM" ;;
+      esac
+    fi
+  fi
+  AC_SUBST([EXP2L_LIBM])
+])