[slang-devel] Honoring compilation env vars in slexpat

[Rafael Laboissière <rafael@xxxxxxxxxx>]

Hello,

When building slexpat for Debian, we should ensure that the environment 
variable CPPFLAGS, and LDFLAGS are honored. This is required in Debian, 
because the hardening flags [*] -D_FORTIFY_SOURCE=2 and -Wl,-z,relro must 
be used in the compilation and linking of C files.

Best,

Rafael Laboissière

[*] https://wiki.debian.org/Hardening

Description: Honor the environment variables CPPFLAGS and LDFLAGS
 This is required in Debian, such that hardening flags like
 -D_FORTIFY_SOURCE=2 and -Wl,-z,relro are used in the compilation
 and linking of C files.
Author: Rafael Laboissière <rafael@xxxxxxxxxx>
Forwarded: https://lists.jedsoft.org/lists/slang-devel/2021/0000011.html
Last-Update: 2021-11-18

--- slexpat-0.5.0.orig/Makefile
+++ slexpat-0.5.0/Makefile
@@ -41,7 +41,7 @@ INCS = $(SLANG_INC)
 all: expat-module.so
 
 expat-module.so: expat-module.c
-	$(CC_SHARED) $(INCS) expat-module.c -o expat-module.so $(LIBS)
+	$(CC_SHARED) $(CPPFLAGS) $(INCS) $(LDFLAGS) expat-module.c -o expat-module.so $(LIBS)
 
 expat.hlp: expatfuns.tm
 	tmexpand -Mslhlp expatfuns.tm expat.hlp