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package: make bison a relocatable package

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Suggested by David Barto
https://lists.gnu.org/archive/html/help-bison/2015-02/msg00004.html
and Victor Zverovich.
https://lists.gnu.org/archive/html/bison-patches/2018-10/msg00121.html

This is very easy to do, thanks to work by Bruno Haible in gnulib.
See "Supporting Relocation" in gnulib's documentation.

* bootstrap.conf: We need relocatable-prog and relocatable-script (for yacc).

* src/yacc.in: New.
* configure.ac, src/local.mk: Instantiate it.
* src/main.c, src/output.c (main, pkgdatadir): Use relocatable2.

* doc/bison.texi (FAQ): Document it.
This commit is contained in:
Akim Demaille
2018-12-25 08:19:50 +01:00
parent 53f1a0b114
commit a4ede8f85b
15 changed files with 105 additions and 16 deletions
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14
src/output.c
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@@ -26,6 +26,7 @@
#include <get-errno.h>
#include <path-join.h>
#include <quotearg.h>
#include <relocatable.h> /* relocate2 */
#include <spawn-pipe.h>
#include <timevar.h>
#include <wait-process.h>
@@ -44,6 +45,9 @@
static struct obstack format_obstack;
/* Memory allocated by relocate2, to free. */
static char *relocate_buffer = NULL;
/*-------------------------------------------------------------------.
| Create a function NAME which associates to the muscle NAME the |
@@ -718,11 +722,17 @@ output (void)
unlink_generated_sources ();
obstack_free (&format_obstack, NULL);
free (relocate_buffer);
}
char const *
pkgdatadir (void)
{
char const *cp = getenv ("BISON_PKGDATADIR");
return cp ? cp : PKGDATADIR;
if (relocate_buffer)
return relocate_buffer;
else
{
char const *cp = getenv ("BISON_PKGDATADIR");
return cp ? cp : relocate2 (PKGDATADIR, &relocate_buffer);
}
}