plural.c: improve reproducibility

There is a subtle non-determinism when building glibc.
This depends on whether the glibc is built using the distibuted
file intl/plural.c or built using the generated file intl/plural.c.
These two files (intl/plural.c generated vs. distributed) are slightly
different, hence we may end up with slightly different libraries.

Originally, having "bison" installed was optional. So if "bison" was
not present, we always built libraries with the distributed plural.c.
If bison was installed, we *** may have *** replaced the distributed
file plural.c with a new plural.c generated from plural.y. if the
timestamps triggered this rule:

plural.c plural.y
	$(BISON) $(BISONFLAGS) $@ $^

Given that timestamps are not preserved in GIT repositories, the above
rule is not reliable without explicitly touching plural.c or plural.y.
In other words, the rule may or may not have fired.

In summary: there are two distinct sources of non-determinism:

1. Having "bison" installed or not
2. Having "bison" installed but timestamps poorly defined.

This patch fixes this by requiring "bison" being installed
and by always generating intl/plural.c from intl/plural.y.
(This is achieved by simply removing checked-in intl/plural.c)

	[BZ #22432]
	* configure.ac (BISON): Require to be present.
	* configure: Regenerated.
	* intl/Makefile (generated): Add plural.c.
	[$(BISON) != no]: Make code unconditional.
	(plural.c): Change rule to $(objpfx)plural.c.
	($(objpfx)plural.o): Depend on $(objpfx)plural.c.
	* intl/plural.c: Remove.
	* manual/install.texi (Tools for Compilation): Document bison as
	required.
	* INSTALL: Regenerated.

1 files changed, 6 insertions, 8 deletions

diff --git a/manual/install.texi b/manual/install.texi
index f1fa28c937..ea559e4e72 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -510,6 +510,12 @@ As of release time, @code{gawk} version 4.1.3 is the newest verified
 to work to build @theglibc{}.
 
 @item
+GNU @code{bison} 2.7 or later
+
+@code{bison} is used to generate the @code{yacc} parser code in the @file{intl}
+subdirectory.
+
+@item
 Perl 5
 
 Perl is not required, but it is used if present to test the
@@ -540,14 +546,6 @@ and if you change any of the message translation files you will need
 GNU @code{gettext} 0.10.36 or later
 @end itemize
 
-@noindent
-If you wish to regenerate the @code{yacc} parser code in the @file{intl}
-subdirectory you will need
-
-@itemize @bullet
-@item
-GNU @code{bison} 2.7 or later
-@end itemize
 
 @noindent
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