Patch to pandaPIparser makefile for easier compilation on Mac

[rpgoldman]

As you point out in the readme, the versions of bison and flex on the Mac are unsuitable for building pandaPIparser.

I modified the makefile to make BISON and FLEX variables, so that on the Mac one can build like this (for example):

BISON=/opt/homebrew/opt/bison/bin/bison FLEX=/opt/homebrew/opt/flex/bin/flex make -j

Here's a patch from git format-patch:

These make it easier to override the default versions of these
programs, which is particularly helpful on Mac, because the versions
there are so old.
---
 makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/makefile b/makefile
index fbb2ecd..c159ce8 100644
--- a/makefile
+++ b/makefile
@@ -1,4 +1,6 @@
 CXX=g++
+BISON ?= bison
+FLEX ?= flex

 CWARN=-Wno-unused-parameter
 CERROR=
@@ -31,11 +33,11 @@ all: src/hddl-token.o src/hddl.o src/main.o src/sortexpansion.o src/parsetree.o
        ${CXX} ${COMPILEFLAGS} -o $@ -c $<

 src/hddl-token.cpp: src/hddl.cpp src/hddl-token.l
-       flex --yylineno -o src/hddl-token.cpp src/hddl-token.l
+       $(FLEX) --yylineno -o src/hddl-token.cpp src/hddl-token.l

 src/hddl.cpp: src/hddl.y
-       bison -v -d -o src/hddl.cpp src/hddl.y
+       $(BISON) -v -d -o src/hddl.cpp src/hddl.y

 src/hddl.hpp: src/hddl.cpp

--
2.40.1

[galvusdamor]

Thanks @rpgoldman !

I've actually gone a step further and made the homebrew paths the default for MacOS now -- the default versions of both flex and bison are too old to compile correctly anyway. This is not integrated into this commit and the master branch.

Can you test it?

[rpgoldman]

I will test it, and also I have asked colleagues if they can tell me where MacPorts puts flex and bison so the build script can support MacPorts users as well as Homebrew users.

[rpgoldman]

flex and bison can be found in /opt/local/bin when they are installed by MacPorts. So maybe the scripts could be modified to look for them from brew or MacPorts and otherwise fail?