From b67367d1e7173a73dab418c85935b64b986897b3 Mon Sep 17 00:00:00 2001
From: Gareth Davidson <gareth.davidson@williamhill.co.uk>
Date: Thu, 29 Jul 2021 05:57:02 +0100
Subject: [PATCH] allow compile on a Mac

Apple's binutils ld removes externs from linked .a files unless you
pass the -all_load flag, resulting in a build-time undefined
symbol.

Also, it uses -install_name rather than -soname

I didn't change the name of the .so file. Might be a good idea to use
cmake to support cross-platform compilation.
---
 _eSSP/Makefile | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/_eSSP/Makefile b/_eSSP/Makefile
index f9f25bb..a698d67 100644
--- a/_eSSP/Makefile
+++ b/_eSSP/Makefile
@@ -1,5 +1,13 @@
 LIBS=-lstdc++ -lpthread
 
+UNAME := $(shell uname)
+
+ifeq ($(UNAME), Darwin)
+LINK = -Wl,-all_load,-install_name,libessp.so.1
+else
+LINK = -Wl,-soname,libessp.so.1
+endif
+
 .PHONY: clean
 
 libessp.so:
@@ -8,7 +16,7 @@ libessp.so:
 	$(CC) -c -fPIC -ggdb -g3 -o $@ $^
 
 libessp.so: init.o ssp_helpers.o linux.o lib/bin/libitlssp.a
-	$(CC) -shared -fPIC -ggdb -g3 -Wl,-soname,libessp.so.1 -o $@ $^
+	$(CC) -shared -fPIC -ggdb -g3 $(LINK) -o $@ $^
 
 lib/bin/libitlssp.a:
 	mkdir -p lib/bin/shared