Accepting request 885313 from home:wfrisch:branches:devel:libraries:c_c++

Enable Position Independent Code and inherit CFLAGS from the build system.

FYI: The package fails to build on SLE_12_SP5 and I'm not sure why.

OBS-URL: https://build.opensuse.org/request/show/885313
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/giflib?expand=0&rev=53

PIE.patch

@@ -0,0 +1,21 @@
+Index: a/Makefile
+===================================================================
+--- a/Makefile
++++ b/Makefile
+@@ -8,7 +8,7 @@
+ #
+ OFLAGS = -O0 -g
+ OFLAGS  = -O2
+-CFLAGS  = -std=gnu99 -fPIC -Wall -Wno-format-truncation $(OFLAGS)
++CFLAGS  += -std=gnu99 -fPIC -Wall -Wno-format-truncation $(OFLAGS)
+ 
+ SHELL = /bin/sh
+ TAR = tar
+@@ -64,6 +64,7 @@ LDLIBS=libgif.a -lm
+ all: libgif.so libgif.a libutil.so libutil.a $(UTILS)
+ 	$(MAKE) -C doc
+ 
++$(UTILS):: LDFLAGS += -pie
+ $(UTILS):: libgif.a libutil.a
+ 
+ libgif.so: $(OBJECTS) $(HEADERS)

giflib.spec

@@ -1,7 +1,7 @@
 #
 # spec file for package giflib
 #
-# Copyright (c) 2020 SUSE LLC
+# Copyright (c) 2021 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -25,6 +25,7 @@ License:        MIT
 URL:            http://giflib.sf.net/
 Source:         http://downloads.sf.net/giflib/%{name}-%{version}.tar.gz
 Source2:        baselibs.conf
+Patch1:         PIE.patch
 BuildRequires:  libtool >= 2
 
 %description
@@ -55,7 +56,7 @@ This Library allows manipulating GIF Image files. Since the LZW patents
 have expired, giflib can again be used instead of libungif.
 
 %prep
-%autosetup
+%autosetup -p1
 for file in `find util -name "*.c"`; do
 	touch -r $file $file.stamp
 done