New module 'truncf-ieee'. * modules/truncf-ieee: New file. * m4/truncf.m4 (gl_FUNC_TRUNCF): If gl_FUNC_TRUNCF_IEEE is also used, test whether truncf works according to ISO C 99 with IEC 60559. * m4/truncf-ieee.m4: New file. * lib/math.in.h (truncf): Replace if REPLACE_TRUNCF is set. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_TRUNCF. * modules/math (Makefile.am): Substitute REPLACE_TRUNCF. * modules/truncf-ieee-tests: New file. * tests/test-truncf-ieee.c: New file, based on tests/test-truncf1.c. * tests/test-truncf1.c (main): Remove signbit tests. * modules/truncf-tests (Depends-on): Remove 'signbit'. * doc/posix-functions/truncf.texi: Mention the new module.

--- a/modules/math
+++ b/modules/math
@@ -107,6 +107,7 @@
 	      -e 's|@''REPLACE_ROUNDL''@|$(REPLACE_ROUNDL)|g' \
 	      -e 's|@''REPLACE_SIGNBIT''@|$(REPLACE_SIGNBIT)|g' \
 	      -e 's|@''REPLACE_SIGNBIT_USING_GCC''@|$(REPLACE_SIGNBIT_USING_GCC)|g' \
+	      -e 's|@''REPLACE_TRUNCF''@|$(REPLACE_TRUNCF)|g' \
 	      -e 's|@''REPLACE_TRUNCL''@|$(REPLACE_TRUNCL)|g' \
 	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
 	      -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \