1 files changed, 48 insertions, 0 deletions
diff --git a/m4/printf-frexpl.m4 b/m4/printf-frexpl.m4
new file mode 100644
index 0000000..1c550c8
--- /dev/null
+++ b/m4/printf-frexpl.m4
@@ -0,0 +1,48 @@
+# printf-frexpl.m4 serial 10
+dnl Copyright (C) 2007, 2009-2020 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.
+
+dnl Check how to define printf_frexpl() without linking with libm.
+
+AC_DEFUN([gl_FUNC_PRINTF_FREXPL],
+[
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
+  dnl Subset of gl_FUNC_FREXPL_NO_LIBM.
+  gl_CHECK_FREXPL_NO_LIBM
+  if test $gl_cv_func_frexpl_no_libm = yes; then
+    gl_FUNC_FREXPL_WORKS
+    case "$gl_cv_func_frexpl_works" in
+      *yes) gl_func_frexpl_no_libm=yes ;;
+      *)    gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
+    esac
+  else
+    gl_func_frexpl_no_libm=no
+    dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
+    REPLACE_FREXPL=1
+  fi
+  if test $gl_func_frexpl_no_libm = yes; then
+    AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1],
+      [Define if the frexpl function is available in libc.])
+    dnl Also check whether it's declared.
+    dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+    AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
+  fi
+
+  gl_CHECK_LDEXPL_NO_LIBM
+  if test $gl_cv_func_ldexpl_no_libm = yes; then
+    gl_FUNC_LDEXPL_WORKS
+    case "$gl_cv_func_ldexpl_works" in
+      *yes)
+        AC_DEFINE([HAVE_LDEXPL_IN_LIBC], [1],
+          [Define if the ldexpl function is available in libc.])
+        dnl Also check whether it's declared.
+        dnl Mac OS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
+        AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [[#include <math.h>]])
+        ;;
+    esac
+  fi
+])