Subject: [PATCH iproute2] make yacc usage POSIX compatible

From: Ethan Sommer <[email-masked]>
Date: Wed, 8 Jan 2020 14:57:05 -0500

config: put YACC in config.mk and use environmental variable if present

ss:
use YACC variable instead of hardcoding bison
place options before source file argument
use -b to specify file prefix instead of output file, as -o isn't POSIX
compatible, this generates ssfilter.tab.c instead of ssfilter.c
replace any references to ssfilter.c with references to ssfilter.tab.c

tc:
use -p flag to set name prefix instead of bison-specific api.prefix
directive
remove unneeded bison-specific directives
use -b instead of -o, replace references to previously generated
emp_ematch.yacc.[ch] with references to newly generated
emp_ematch.tab.[ch]

Signed-off-by: Ethan Sommer <[email-masked]>
---
 configure       |  2 ++
 misc/.gitignore |  2 +-
 misc/Makefile   |  6 +++---
 tc/.gitignore   |  4 ++--
 tc/Makefile     | 13 ++++++-------
 tc/emp_ematch.l |  2 +-
 tc/emp_ematch.y |  5 -----
 7 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/configure b/configure
index 45fcffb6..f415bf49 100755
--- a/configure
+++ b/configure
@@ -16,9 +16,11 @@ check_toolchain()
     : ${PKG_CONFIG:=pkg-config}
     : ${AR=ar}
     : ${CC=gcc}
+    : ${YACC=bison}
     echo "PKG_CONFIG:=${PKG_CONFIG}" >>$CONFIG
     echo "AR:=${AR}" >>$CONFIG
     echo "CC:=${CC}" >>$CONFIG
+    echo "YACC:=${YACC}" >>$CONFIG
 }
 
 check_atm()
diff --git a/misc/.gitignore b/misc/.gitignore
index f73f7f21..d7df0b02 100644
--- a/misc/.gitignore
+++ b/misc/.gitignore
@@ -1,7 +1,7 @@
 arpd
 ifstat
 ss
-ssfilter.c
+ssfilter.tab.c
 nstat
 lnstat
 rtacct
diff --git a/misc/Makefile b/misc/Makefile
index 6a849af4..1debfb15 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-SSOBJ=ss.o ssfilter.o
+SSOBJ=ss.o ssfilter.tab.o
 LNSTATOBJ=lnstat.o lnstat_util.o
 
 TARGETS=ss nstat ifstat rtacct lnstat
@@ -27,8 +27,8 @@ rtacct: rtacct.c
 arpd: arpd.c
 	$(QUIET_CC)$(CC) $(CFLAGS) -I$(DBM_INCLUDE) $(CPPFLAGS) $(LDFLAGS) -o arpd arpd.c $(LDLIBS) -ldb
 
-ssfilter.c: ssfilter.y
-	$(QUIET_YACC)bison ssfilter.y -o ssfilter.c
+ssfilter.tab.c: ssfilter.y
+	$(QUIET_YACC)$(YACC) -b ssfilter ssfilter.y
 
 lnstat: $(LNSTATOBJ)
 	$(QUIET_LINK)$(CC) $^ $(LDFLAGS) $(LDLIBS) -o $@
diff --git a/tc/.gitignore b/tc/.gitignore
index e8e86c97..0dbe9195 100644
--- a/tc/.gitignore
+++ b/tc/.gitignore
@@ -1,5 +1,5 @@
-*.yacc.c
+*.tab.c
 *.lex.c
 *.output
-*.yacc.h
+*.tab.h
 tc
diff --git a/tc/Makefile b/tc/Makefile
index 14171a28..a378c403 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 TCOBJ= tc.o tc_qdisc.o tc_class.o tc_filter.o tc_util.o tc_monitor.o \
        tc_exec.o m_police.o m_estimator.o m_action.o m_ematch.o \
-       emp_ematch.yacc.o emp_ematch.lex.o
+       emp_ematch.tab.o emp_ematch.lex.o
 
 include ../config.mk
 
@@ -125,7 +125,6 @@ ifneq ($(IPT_LIB_DIR),)
 	CFLAGS += -DIPT_LIB_DIR=\"$(IPT_LIB_DIR)\"
 endif
 
-YACC := bison
 LEX := flex
 CFLAGS += -DYY_NO_INPUT
 
@@ -158,8 +157,8 @@ install: all
 	fi
 
 clean:
-	rm -f $(TCOBJ) $(TCLIB) libtc.a tc *.so emp_ematch.yacc.h; \
-	rm -f emp_ematch.yacc.*
+	rm -f $(TCOBJ) $(TCLIB) libtc.a tc *.so emp_ematch.tab.h; \
+	rm -f emp_ematch.tab.*
 
 q_atm.so: q_atm.c
 	$(QUIET_CC)$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -shared -fpic -o q_atm.so q_atm.c -latm
@@ -178,8 +177,8 @@ ifeq ($(TC_CONFIG_XT),y)
   LDLIBS += $$($(PKG_CONFIG) xtables --libs)
 endif
 
-%.yacc.c: %.y
-	$(QUIET_YACC)$(YACC) $(YACCFLAGS) -o $@ $<
+%.tab.c: %.y
+	$(QUIET_YACC)$(YACC) $(YACCFLAGS) -p ematch_ -b $(basename $(basename $@)) $<
 
 %.lex.c: %.l
 	$(QUIET_LEX)$(LEX) $(LEXFLAGS) -o$@ $<
@@ -187,7 +186,7 @@ endif
 # our lexer includes the header from yacc, so make sure
 # we don't attempt to compile it before the header has
 # been generated as part of the yacc step.
-emp_ematch.lex.o: emp_ematch.yacc.c
+emp_ematch.lex.o: emp_ematch.tab.c
 
 ifneq ($(SHARED_LIBS),y)
 
diff --git a/tc/emp_ematch.l b/tc/emp_ematch.l
index d7a99304..2f4926d4 100644
--- a/tc/emp_ematch.l
+++ b/tc/emp_ematch.l
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 %{
- #include "emp_ematch.yacc.h"
+ #include "emp_ematch.tab.h"
  #include "m_ematch.h"
 
  extern int ematch_argc;
diff --git a/tc/emp_ematch.y b/tc/emp_ematch.y
index a02e831a..4da3daed 100644
--- a/tc/emp_ematch.y
+++ b/tc/emp_ematch.y
@@ -6,11 +6,6 @@
  #include "m_ematch.h"
 %}
 
-%locations
-%token-table
-%define parse.error verbose
-%define api.prefix {ematch_}
-
 %union {
 	unsigned int i;
 	struct bstr *b;
-- 
2.24.1