suppress warnings from using Bison extensions in lib/cgraph/grammar.y

We don't currently use any, but are about to introduce one. For some more back
story on this, we quote the Bison 3.0 release notes:

  *** Use of YACC='bison -y'

  TL;DR: With Autoconf <= 2.69, pass -Wno-yacc to (AM_)YFLAGS if you use
  Bison extensions.

  Traditional Yacc generates 'y.tab.c' whatever the name of the input file.
  Therefore Makefiles written for Yacc expect 'y.tab.c' (and possibly
  'y.tab.h' and 'y.outout') to be generated from 'foo.y'.

  To this end, for ages, AC_PROG_YACC, Autoconf's macro to look for an
  implementation of Yacc, was using Bison as 'bison -y'.  While it does
  ensure compatible output file names, it also enables warnings for
  incompatibilities with POSIX Yacc.  In other words, 'bison -y' triggers
  warnings for Bison extensions.

  Autoconf 2.70+ fixes this incompatibility by using YACC='bison -o y.tab.c'
  (which also generates 'y.tab.h' and 'y.output' when needed).
  Alternatively, disable Yacc warnings by passing '-Wno-yacc' to your Yacc
  flags (YFLAGS, or AM_YFLAGS with Automake).

diff --git a/lib/cgraph/Makefile.am b/lib/cgraph/Makefile.am
index 54f50c21f906b4f0747490ae73eca7691b2f33d4..2774c54e41a79a4052df1ce5b8b6703df0e3eb23 100644 (file)
--- a/lib/cgraph/Makefile.am
+++ b/lib/cgraph/Makefile.am
@@ -42,7 +42,7 @@ grammar.h: y.tab.h
 y.tab.c y.tab.h: y.output
 
 y.output: $(top_srcdir)/lib/cgraph/grammar.y
-       @YACC@ -dv $(top_srcdir)/lib/cgraph/grammar.y
+       @YACC@ -Wno-yacc -dv $(top_srcdir)/lib/cgraph/grammar.y
 
 cgraph.3.pdf: cgraph.3.ps
        @PS2PDF@ $< $@

diff --git a/lib/cgraph/cgraph.vcxproj b/lib/cgraph/cgraph.vcxproj
index faf248b2cda25f30e3c6233b0553f5debab59dad..fff37f5f879bc793ba364b47b9ca8a1c6b16144c 100644 (file)
--- a/lib/cgraph/cgraph.vcxproj
+++ b/lib/cgraph/cgraph.vcxproj
@@ -70,7 +70,7 @@
       <TargetMachine>MachineX86</TargetMachine>
     </Link>
     <PreBuildEvent>
-      <Command>win_bison -dy grammar.y -o grammar.c
+      <Command>win_bison -Wno-yacc -dy grammar.y -o grammar.c
 win_flex -oscan.c scan.l</Command>
     </PreBuildEvent>
   </ItemDefinitionGroup>
@@ -93,7 +93,7 @@ win_flex -oscan.c scan.l</Command>
       <TargetMachine>MachineX86</TargetMachine>
     </Link>
     <PreBuildEvent>
-      <Command>win_bison -dy grammar.y -o grammar.c
+      <Command>win_bison -Wno-yacc -dy grammar.y -o grammar.c
 win_flex -oscan.c scan.l</Command>
     </PreBuildEvent>
   </ItemDefinitionGroup>