stdbit-h, stdc_*: New modules, part of the stdbit module.

* lib/stdbit.in.h (_GL_STDC_*_INLINE): New macros.
Enclose function definitions in #if @GL_STDC_*@ conditionals.
* lib/stdc_leading_zeros.c: New file.
* lib/stdc_leading_ones.c: New file.
* lib/stdc_trailing_zeros.c: New file.
* lib/stdc_trailing_ones.c: New file.
* lib/stdc_first_leading_zero.c: New file.
* lib/stdc_first_leading_one.c: New file.
* lib/stdc_first_trailing_zero.c: New file.
* lib/stdc_first_trailing_one.c: New file.
* lib/stdc_count_zeros.c: New file.
* lib/stdc_count_ones.c: New file, based on lib/stdbit.c.
* lib/stdc_has_single_bit.c: New file.
* lib/stdc_bit_width.c: New file.
* lib/stdc_bit_floor.c: New file.
* lib/stdc_bit_ceil.c: New file.
* lib/stdbit.c (__gl_stdbit_popcount_support): Remove variable.
* m4/stdbit_h.m4 (gl_STDBIT_H): Initialize GL_STDC_* variables.
* modules/stdbit-h: New file, based on modules/stdbit.
(Depends-on): Add gen-header.
(Makefile.am): Substitute GL_STDC_* variables.
* modules/stdc_leading_zeros: New file.
* modules/stdc_leading_ones: New file.
* modules/stdc_trailing_zeros: New file.
* modules/stdc_trailing_ones: New file.
* modules/stdc_first_leading_zero: New file.
* modules/stdc_first_leading_one: New file.
* modules/stdc_first_trailing_zero: New file.
* modules/stdc_first_trailing_one: New file.
* modules/stdc_count_zeros: New file.
* modules/stdc_count_ones: New file.
* modules/stdc_has_single_bit: New file.
* modules/stdc_bit_width: New file.
* modules/stdc_bit_floor: New file.
* modules/stdc_bit_ceil: New file.
* modules/stdbit: Change to a pure composition module.
* modules/stdc_leading_zeros-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_leading_ones-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_trailing_zeros-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_trailing_ones-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_first_leading_zero-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_first_leading_one-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_first_trailing_zero-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_first_trailing_one-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_count_zeros-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_count_ones-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_has_single_bit-tests: New file, based on
modules/stdbit-tests.
* modules/stdc_bit_width-tests: New file, based on modules/stdbit-tests.
* modules/stdc_bit_floor-tests: New file, based on modules/stdbit-tests.
* modules/stdc_bit_ceil-tests: New file, based on modules/stdbit-tests.
* modules/stdbit-tests: Remove file.
* doc/posix-functions/stdc_leading_zeros.texi: Update.
* doc/posix-functions/stdc_leading_ones.texi: Likewise.
* doc/posix-functions/stdc_trailing_zeros.texi: Likewise.
* doc/posix-functions/stdc_trailing_ones.texi: Likewise.
* doc/posix-functions/stdc_first_leading_zero.texi: Likewise.
* doc/posix-functions/stdc_first_leading_one.texi: Likewise.
* doc/posix-functions/stdc_first_trailing_zero.texi: Likewise.
* doc/posix-functions/stdc_first_trailing_one.texi: Likewise.
* doc/posix-functions/stdc_count_zeros.texi: Likewise.
* doc/posix-functions/stdc_count_ones.texi: Likewise.
* doc/posix-functions/stdc_has_single_bit.texi: Likewise.
* doc/posix-functions/stdc_bit_width.texi: Likewise.
* doc/posix-functions/stdc_bit_floor.texi: Likewise.
* doc/posix-functions/stdc_bit_ceil.texi: Likewise.

modules/stdbit-h

@@ -0,0 +1,58 @@
+Description:
+A <stdbit.h> for platforms that lack it.
+
+Files:
+lib/stdbit.in.h
+lib/stdbit.c
+m4/stdbit_h.m4
+
+Depends-on:
+gen-header
+extern-inline           [$GL_GENERATE_STDBIT_H]
+stdbool                 [$GL_GENERATE_STDBIT_H]
+
+configure.ac:
+gl_STDBIT_H
+gl_CONDITIONAL_HEADER([stdbit.h])
+AC_PROG_MKDIR_P
+
+Makefile.am:
+BUILT_SOURCES += $(STDBIT_H)
+
+# We need the following in order to create <stdbit.h> when the system
+# doesn't have one that works with the given compiler.
+if GL_GENERATE_STDBIT_H
+stdbit.h: stdbit.in.h $(top_builddir)/config.status
+@NMD@	$(AM_V_GEN)$(MKDIR_P) '%reldir%'
+	$(gl_V_at)$(SED_HEADER_STDOUT) \
+	  -e 's/@''GL_STDC_LEADING_ZEROS''@/$(GL_STDC_LEADING_ZEROS)/g' \
+	  -e 's/@''GL_STDC_LEADING_ONES''@/$(GL_STDC_LEADING_ONES)/g' \
+	  -e 's/@''GL_STDC_TRAILING_ZEROS''@/$(GL_STDC_TRAILING_ZEROS)/g' \
+	  -e 's/@''GL_STDC_TRAILING_ONES''@/$(GL_STDC_TRAILING_ONES)/g' \
+	  -e 's/@''GL_STDC_FIRST_LEADING_ZERO''@/$(GL_STDC_FIRST_LEADING_ZERO)/g' \
+	  -e 's/@''GL_STDC_FIRST_LEADING_ONE''@/$(GL_STDC_FIRST_LEADING_ONE)/g' \
+	  -e 's/@''GL_STDC_FIRST_TRAILING_ZERO''@/$(GL_STDC_FIRST_TRAILING_ZERO)/g' \
+	  -e 's/@''GL_STDC_FIRST_TRAILING_ONE''@/$(GL_STDC_FIRST_TRAILING_ONE)/g' \
+	  -e 's/@''GL_STDC_COUNT_ZEROS''@/$(GL_STDC_COUNT_ZEROS)/g' \
+	  -e 's/@''GL_STDC_COUNT_ONES''@/$(GL_STDC_COUNT_ONES)/g' \
+	  -e 's/@''GL_STDC_HAS_SINGLE_BIT''@/$(GL_STDC_HAS_SINGLE_BIT)/g' \
+	  -e 's/@''GL_STDC_BIT_WIDTH''@/$(GL_STDC_BIT_WIDTH)/g' \
+	  -e 's/@''GL_STDC_BIT_FLOOR''@/$(GL_STDC_BIT_FLOOR)/g' \
+	  -e 's/@''GL_STDC_BIT_CEIL''@/$(GL_STDC_BIT_CEIL)/g' \
+	  $(srcdir)/stdbit.in.h > $@-t
+	$(AM_V_at)mv $@-t $@
+lib_SOURCES += stdbit.c
+else
+stdbit.h: $(top_builddir)/config.status
+	rm -f $@
+endif
+MOSTLYCLEANFILES += stdbit.h stdbit.h-t
+
+Include:
+<stdbit.h>
+
+License:
+LGPLv2+
+
+Maintainer:
+all