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diff m4/acinclude.m4 @ 29746:7f339da6cabd

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avoid possible gcc warning about C++ one definition rule (bug #60586) * acinclude.m4 (OCTAVE_PROG_BISON): Also check whether api.prefix applies to yysymbol_kind_t in the files that bison generates. If so, substitute new variables, OCTAVE_PARSER_CPPFLAGS and OCTAVE_TEX_PARSER_CPPFLAGS. * libinterp/corefcn/module.mk (%canon_reldir%_libcorefcn_la_CPPFLAGS): Add $(OCTAVE_TEX_PARSER_CPPFLAGS) to the list. * libinterp/parse-tree/module.mk (%canon_reldir%_libparse_tree_la_CPPFLAGS): Add $(OCTAVE_PARSER_CPPFLAGS) to the list.
author John W. Eaton <jwe@octave.org>
date Tue, 08 Jun 2021 15:49:37 -0400
parents 5811df727e96
children e0fded8bd7bb
line wrap: on
line diff
--- a/m4/acinclude.m4	Mon Jun 07 22:54:48 2021 +0200
+++ b/m4/acinclude.m4	Tue Jun 08 15:49:37 2021 -0400
@@ -3221,6 +3221,39 @@
       done
       rm -f conftest.yy y.tab.h y.tab.c
       ])
+
+    AC_CACHE_CHECK([whether api.prefix applies to yysymbol_kind_t],
+                   [octave_cv_bison_api_prefix_applies_to_yysymbol_kind_t], [
+      [case "$octave_cv_bison_api_prefix_decl_style" in
+        "api brace")
+          def='%define api.prefix {PREFIX_}'
+        ;;
+        "api quote")
+          def='%define api.prefix "PREFIX_"'
+        ;;
+        "name brace")
+          def='%define name-prefix {PREFIX_}'
+        ;;
+        "name quote")
+          def='%define name-prefix "PREFIX_"'
+        ;;
+      esac]
+      cat << EOF > conftest.yy
+$def
+%start input
+%%
+input:;
+%%
+EOF
+      ## Older versions of bison only warn and exit with success.
+      $YACC $WARN_YFLAGS conftest.yy
+      if grep PREFIX_symbol_kind_t y.tab.c > /dev/null; then
+        octave_cv_bison_api_prefix_applies_to_yysymbol_kind_t=yes
+      else
+        octave_cv_bison_api_prefix_applies_to_yysymbol_kind_t=no
+      fi
+      rm -f conftest.yy y.tab.h y.tab.c
+      ])
   fi
 
   if test -z "$octave_cv_bison_api_prefix_decl_style" \
@@ -3245,7 +3278,14 @@
 building from VCS sources.
 "
     OCTAVE_CONFIGURE_WARNING([warn_bison])
+
   fi
+  if test "$octave_cv_bison_api_prefix_applies_to_yysymbol_kind_t" = no; then
+    OCTAVE_PARSER_CPPFLAGS="-Dyysymbol_kind_t=octave_symbol_kind_t"
+    OCTAVE_TEX_PARSER_CPPFLAGS="-Dyysymbol_kind_t=octave_tex_symbol_kind_t"
+  fi
+  AC_SUBST(OCTAVE_PARSER_CPPFLAGS)
+  AC_SUBST(OCTAVE_TEX_PARSER_CPPFLAGS)
   AC_SUBST(WARN_YFLAGS)
 ])
 dnl