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no-lines: avoid leaving an empty line instead of the syncline

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Currently, with --no-lines, instead of "#line file line\n", we emit
"\n".  Let's emit nothing.

* data/skeletons/bison.m4 (b4_syncline): Emit at end-of-line when enabled.
* data/skeletons/bison.m4, data/skeletons/c.m4, data/skeletons/glr.cc,
* data/skeletons/lalr1.cc, src/output.c: Use dnl after b4_syncline to
avoid spurious empty lines.

* tests/synclines.at (Sync Lines): Make sure that --no-lines is like
grep -v #line.
* tests/calc.at: Make sure that a rich grammar file behaves properly
with %no-lines.
This commit is contained in:
Akim Demaille
2019-04-01 18:23:20 +02:00
parent 9832fdd6ef
commit 0f193d2d21
11 changed files with 71 additions and 37 deletions
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31
tests/synclines.at
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@@ -28,7 +28,7 @@ AT_BANNER([[Sync Lines.]])
m4_define([_AT_SYNCLINES_COMPILE],
[AT_CHECK([$CC $CFLAGS $CPPFLAGS -c $1], [ignore], [], [stderr])
# Transform stderr into something like this:
# Transform the file 'stderr' into something like this:
#
# input.y:4: #error "4"
#
@@ -121,7 +121,7 @@ EOF
# AT_SYNCLINES_COMPILE(FILE)
# --------------------------
# Compile FILE expecting an error, and save in the file stdout the
# Compile FILE expecting an error, and save in the file 'stdout' the
# normalized output. If we can't get a trustable location
# from the compiler, just skip the test.
#
@@ -449,11 +449,36 @@ AT_DATA_GRAMMAR([input.y],
]AT_YYERROR_DECLARE_EXTERN[
]AT_YYLEX_DECLARE_EXTERN[
%}
%union {
int ival;
}
%%
exp: '0'
]])
# Generate without.* without the #line. Don't use -o without.c which
# would change the content (e.g., CPP guard depend on the output file
# name).
AT_BISON_CHECK([--no-lines -o input.AT_LANG_EXT -d input.y])
AT_CHECK([[grep '#line'] *.AT_LANG_EXT *.AT_LANG_HDR], 1)
AT_CHECK([mv input.]AT_LANG_EXT[ without.]AT_LANG_EXT[])
AT_CHECK([mv input.]AT_LANG_HDR[ without.]AT_LANG_HDR[])
# There is no #line at all.
AT_CHECK([grep '#line' *.]AT_LANG_EXT[ *.]AT_LANG_HDR[], 1)
# Generate with.* without the #line.
AT_BISON_CHECK([-o input.AT_LANG_EXT -d input.y])
AT_CHECK([mv input.]AT_LANG_EXT[ with.]AT_LANG_EXT[])
AT_CHECK([mv input.]AT_LANG_HDR[ with.]AT_LANG_HDR[])
# The implementation file with --no-line is exactly the
# original one with #lines removed.
AT_CHECK([grep -v '#line' with.]AT_LANG_EXT[ >expout])
AT_CHECK([cat without.AT_LANG_EXT], 0, [expout])
# Likewise for the header.
AT_CHECK([grep -v '#line' with.]AT_LANG_HDR[ >expout])
AT_CHECK([cat without.AT_LANG_HDR], 0, [expout])
AT_BISON_OPTION_POPDEFS
AT_CLEANUP