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style: no longer use backquotes
* README, REFERENCES, TODO, configure.ac, data/README, data/bison.m4, * data/c++.m4, data/c.m4, data/java.m4, data/lalr1.cc, * data/lalr1.java, data/yacc.c, doc/local.mk, etc/bench.pl.in, * src/conflicts.c, src/files.c, src/getargs.c, src/gram.h, src/lalr.c, * src/location.c, src/location.h, src/muscle-tab.c, src/muscle-tab.h, * src/output.c, src/parse-gram.c, src/parse-gram.y, src/print-xml.c, * src/print.c, src/reader.c, src/reduce.c, src/scan-skel.l, * src/symtab.h, src/system.h, src/tables.c: Use single quotes, as currently recommended by the GNU Coding Standards.
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@@ -313,7 +313,7 @@ m4_define([b4_define_flag_if],
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# _b4_define_flag_if($1, $2, FLAG)
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# --------------------------------
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# Work around the impossibility to define macros inside macros,
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# because issuing `[$1]' is not possible in M4. GNU M4 should provide
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# because issuing '[$1]' is not possible in M4. GNU M4 should provide
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# $$1 a la M5/TeX.
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m4_define([_b4_define_flag_if],
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[m4_if([$1$2], $[1]$[2], [],
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@@ -772,8 +772,8 @@ m4_define([b4_percent_define_default],
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# b4_percent_define_if_define(NAME, [VARIABLE = NAME])
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# ----------------------------------------------------
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# Define b4_NAME_if that executes its $1 or $2 depending whether
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# VARIABLE was %defined. The characters `.' and `-' in VARIABLE are mapped
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# to `_'.
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# VARIABLE was %defined. The characters '.' and `-' in VARIABLE are mapped
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# to '_'.
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m4_define([b4_percent_define_if_define_],
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[m4_define(m4_bpatsubst([b4_$1_if], [[-.]], [_]),
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[b4_percent_define_flag_if(m4_default([$2], [$1]),
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