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simplify the generated #line

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Currently we generate things like:

    #line 683 "src/parse-gram.y" /* yacc.c:316  */

The first part is of course very important: compilers point the users
to their grammar file rather than into the generated parser.  The
second part points to the place in the skeletons that generated this
piece of code.

This dependency on the Bison skeletons generates lots of useless 'git
diff'.  This location is useless for the regular user (who does not
care about the skeletons) and is actually not useful for Bison
developpers too (I never used this to locate the code in skeletons
that generated output).  So disable it completely.  If someone thinks
this was actually useful, a %define variable should be provided to
control the level of verbosity of '#line', in replacement of
--no-lines.

So now, generate:

    #line 683 "src/parse-gram.y"

* data/skeletons/bison.m4 (b4_sync_end): Emit nothing.
This commit is contained in:
Akim Demaille
2019-03-16 08:46:52 +01:00
parent f4c1586454
commit 91bbf4219d
1 changed files with 14 additions and 3 deletions
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17
data/skeletons/bison.m4
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@@ -588,10 +588,11 @@ m4_define([b4_basename],
# b4_syncline(LINE, FILE)
# -----------------------
# Emit "#line LINE FILE /* __LINE__ __FILE__ */".
m4_define([b4_syncline],
[b4_flag_if([synclines],
[b4_sync_start([$1], [$2]) b4_sync_end([__line__],
[b4_basename(m4_quote(__file__))])[]dnl
[b4_sync_start([$1], [$2])[]dnl
b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])[]dnl
])])
# b4_sync_start(LINE, FILE)
@@ -603,7 +604,17 @@ m4_define([b4_sync_start], [b4_comment([$2:$1])])
# -----------------------
# Syncline for the current place, which ends. Typically a comment
# left for the reader.
m4_define([b4_sync_end], [b4_comment([$2:$1])])
m4_define([b4_sync_end], [ b4_comment([$2:$1])]
)
# This generates dependencies on the Bison skeletons hence lots of
# useless 'git diff'. This location is useless for the regular
# user (who does not care about the skeletons) and is actually not
# useful for Bison developpers too (I, Akim, never used this to locate
# the code in skeletons that generated output). So disable it
# completely. If someone thinks this was actually useful, a %define
# variable should be provided to control the level of verbosity of
# '#line', in replacement of --no-lines.
m4_define([b4_sync_end])
# b4_user_code(USER-CODE)