New module 'trunc-ieee'. * modules/trunc-ieee: New file. * m4/trunc.m4 (gl_FUNC_TRUNC): If gl_FUNC_TRUNC_IEEE is also used, test whether trunc works according to ISO C 99 with IEC 60559. * m4/trunc-ieee.m4: New file. * lib/math.in.h (trunc): Replace if REPLACE_TRUNC is set. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_TRUNC. * modules/math (Makefile.am): Substitute REPLACE_TRUNC. * modules/trunc-ieee-tests: New file. * tests/test-trunc-ieee.c: New file, based on tests/test-truncf-ieee.c. * tests/test-trunc1.c (main): Remove signbit tests. * modules/trunc-tests (Depends-on): Remove 'signbit'. * doc/posix-functions/trunc.texi: Mention the new module.

--- a/modules/math
+++ b/modules/math
@@ -111,6 +111,7 @@
 	      -e 's|@''REPLACE_ROUNDL''@|$(REPLACE_ROUNDL)|g' \
 	      -e 's|@''REPLACE_SIGNBIT''@|$(REPLACE_SIGNBIT)|g' \
 	      -e 's|@''REPLACE_SIGNBIT_USING_GCC''@|$(REPLACE_SIGNBIT_USING_GCC)|g' \
+	      -e 's|@''REPLACE_TRUNC''@|$(REPLACE_TRUNC)|g' \
 	      -e 's|@''REPLACE_TRUNCF''@|$(REPLACE_TRUNCF)|g' \
 	      -e 's|@''REPLACE_TRUNCL''@|$(REPLACE_TRUNCL)|g' \
 	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \