New module 'ceil-ieee'. * modules/ceil-ieee: New file. * m4/ceil.m4 (gl_FUNC_CEIL): Require gl_MATH_H_DEFAULTS. If gl_FUNC_CEIL_IEEE is also used, test whether ceil works according to ISO C 99 with IEC 60559. * m4/ceil-ieee.m4: New file. * modules/ceil (Files): Add lib/ceil.c. (Depends-on): Add 'float'. (configure.ac): Invoke gl_MATH_MODULE_INDICATOR. * lib/math.in.h (ceil): New declaration. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize GNULIB_CEIL, REPLACE_CEIL. * modules/math (Makefile.am): Substitute GNULIB_CEIL, REPLACE_CEIL. * modules/ceil-ieee-tests: New file. * tests/test-ceil-ieee.c: New file, based on tests/test-ceilf-ieee.c. * tests/test-math-c++.cc: Check the signature of 'ceil'. * doc/posix-functions/ceil.texi: Mention the new module.

--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -202,6 +202,19 @@
 # endif
 #endif
 
+#if @GNULIB_CEIL@
+# if @REPLACE_CEIL@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   define ceil rpl_ceil
+#  endif
+_GL_FUNCDECL_RPL (ceil, double, (double x));
+_GL_CXXALIAS_RPL (ceil, double, (double x));
+# else
+_GL_CXXALIAS_SYS (ceil, double, (double x));
+# endif
+_GL_CXXALIASWARN (ceil);
+#endif
+
 #if @GNULIB_CEILL@
 # if @REPLACE_CEILL@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)