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api.value.type: diagnose guaranteed failure with --yacc

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Instead of generating invalid C code, generate an error when --yacc and
'%define api.value.type union' are used together.

* data/bison.m4: Issue an error in this case.
* tests/types.at (%yacc vs. %define api.value.type union): New, check this
error.
* doc/bison.texi (Type Generation): Document it.
* tests/output.at: Check that '-o y.tab.c' and '-y' behave equally
wrt generated file names.
* NEWS (Use of YACC='bison -y'): New.
Promote the use of 'bison -o y.tab.c'.
This commit is contained in:
Akim Demaille
2013-03-27 09:18:32 +01:00
parent d1a07886ee
commit 1fa19a7697
5 changed files with 70 additions and 4 deletions
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17
data/bison.m4
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@@ -960,7 +960,12 @@ m4_define_default([b4_parse_param], [])
m4_define_default([b4_location_initial_column], [1])
m4_define_default([b4_location_initial_line], [1])
# Sanity checks.
## --------------- ##
## Sanity checks. ##
## --------------- ##
# api.prefix >< %name-prefix.
b4_percent_define_ifdef([api.prefix],
[m4_ifdef([b4_prefix],
[b4_complain_at(b4_percent_define_get_loc([api.prefix]),
@@ -968,9 +973,19 @@ b4_percent_define_ifdef([api.prefix],
[%name-prefix],
[%define api.prefix])])])
# api.value.type >< %union.
b4_percent_define_ifdef([api.value.type],
[m4_ifdef([b4_union_members],
[b4_complain_at(b4_percent_define_get_loc([api.value.type]),
[['%s' and '%s' cannot be used together]],
[%union],
[%define api.value.type])])])
# api.value.type=union >< %yacc.
b4_percent_define_ifdef([api.value.type],
[m4_if(b4_percent_define_get([api.value.type]), [union],
[b4_yacc_if(dnl
[b4_complain_at(b4_percent_define_get_loc([api.value.type]),
[['%s' and '%s' cannot be used together]],
[%yacc],
[%define api.value.type "union"])])])])