From d5a0c023a7f3deefd471d7b97ef4fa40ed374645 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Wed, 10 Feb 2016 09:47:27 +0100
Subject: [PATCH] build system fixes

This touches up the homebrewed build system to work much better "out of the
box" for people.  Specifically:
	- allow toolchain vars to be set via environment
	- CC / BUILD_CC / AR / RANLIB
	- CFLAGS / CPPFLAGS / LDFLAGS
	- split CPPFLAGS out of CFLAGS
	- break -fPIC out of global CFLAGS and only use where needed
	- use LDLIBS for libraries, not LDFLAGS

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Forward ported from libcap-2.24 to libcap-2.25

Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>
---
 Make.Rules       | 26 ++++++++++++++------------
 libcap/Makefile  |  7 ++++---
 pam_cap/Makefile |  8 +++++---
 progs/Makefile   |  2 +-
 4 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/Make.Rules b/Make.Rules
index 8347b26..d7196ef 100644
--- a/Make.Rules
+++ b/Make.Rules
@@ -45,28 +45,30 @@ MINOR=25
 
 # Compilation specifics
 
-KERNEL_HEADERS := $(topdir)/libcap/include/uapi
-IPATH += -fPIC -I$(KERNEL_HEADERS) -I$(topdir)/libcap/include
-
-CC := gcc
-CFLAGS := -O2 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
-BUILD_CC := $(CC)
-BUILD_CFLAGS := $(CFLAGS) $(IPATH)
-AR := ar
-RANLIB := ranlib
+CC ?= gcc
+CFLAGS ?= -O2
+BUILD_CC ?= $(CC)
+BUILD_CFLAGS ?= $(CFLAGS)
+AR ?= ar
+RANLIB ?= ranlib
 DEBUG = -g #-DDEBUG
 WARNINGS=-Wall -Wwrite-strings \
         -Wpointer-arith -Wcast-qual -Wcast-align \
         -Wstrict-prototypes -Wmissing-prototypes \
         -Wnested-externs -Winline -Wshadow
 LD=$(CC) -Wl,-x -shared
-LDFLAGS := #-g
+LDFLAGS ?= #-g
 BUILD_GPERF := $(shell which gperf >/dev/null 2>/dev/null && echo yes)
 
-SYSTEM_HEADERS = /usr/include
+KERNEL_HEADERS = $(topdir)/libcap/include/uapi
+LIBCAP_CPPFLAGS = -I$(KERNEL_HEADERS) -I$(topdir)/libcap/include
+LIBCAP_CPPFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
+CPPFLAGS += $(LIBCAP_CPPFLAGS)
+BUILD_CPPFLAGS += $(LIBCAP_CPPFLAGS)
 INCS=$(topdir)/libcap/include/sys/capability.h
 LDFLAGS += -L$(topdir)/libcap
-CFLAGS += -Dlinux $(WARNINGS) $(DEBUG)
+CPPFLAGS += -Dlinux
+CFLAGS += $(WARNINGS) $(DEBUG)
 PAM_CAP := $(shell if [ -f /usr/include/security/pam_modules.h ]; then echo yes ; else echo no ; fi)
 INDENT := $(shell if [ -n "$$(which indent 2>/dev/null)" ]; then echo "| indent -kr" ; fi)
 DYNAMIC := $(shell if [ ! -d "$(topdir)/.git" ]; then echo yes; fi)
diff --git a/libcap/Makefile b/libcap/Makefile
index d189777..b99740f 100644
--- a/libcap/Makefile
+++ b/libcap/Makefile
@@ -17,6 +17,7 @@ OBJS=$(addsuffix .o, $(FILES))
 MAJLIBNAME=$(LIBNAME).$(VERSION)
 MINLIBNAME=$(MAJLIBNAME).$(MINOR)
 GPERF_OUTPUT = _caps_output.gperf
+CFLAGS += -fPIC
 
 all: $(MINLIBNAME) $(STALIBNAME) libcap.pc
 
@@ -35,7 +36,7 @@ libcap.pc: libcap.pc.in
 		$< >$@
 
 _makenames: _makenames.c cap_names.list.h
-	$(BUILD_CC) $(BUILD_CFLAGS) $< -o $@
+	$(BUILD_CC) $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $< -o $@
 
 cap_names.h: _makenames
 	./_makenames > cap_names.h
@@ -57,10 +58,10 @@ $(MINLIBNAME): $(OBJS)
 	ln -sf $(MAJLIBNAME) $(LIBNAME)
 
 %.o: %.c $(INCLS)
-	$(CC) $(CFLAGS) $(IPATH) -c $< -o $@
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
 cap_text.o: cap_text.c $(USE_GPERF_OUTPUT) $(INCLS)
-	$(CC) $(CFLAGS) $(IPATH) $(INCLUDE_GPERF_OUTPUT) -c $< -o $@
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(INCLUDE_GPERF_OUTPUT) -c $< -o $@
 
 install: all
 	mkdir -p -m 0755 $(FAKEROOT)$(INCDIR)/sys
diff --git a/pam_cap/Makefile b/pam_cap/Makefile
index cc32fb6..6f07b6b 100644
--- a/pam_cap/Makefile
+++ b/pam_cap/Makefile
@@ -9,6 +9,8 @@ include ../Make.Rules
 # written (and you know why it fails), email me and explain why. Thanks!
 LDLIBS += -L../libcap -lcap
 
+CFLAGS += -fPIC
+
 all: pam_cap.so
 	$(MAKE) testcompile
 
@@ -17,13 +19,13 @@ install: all
 	install -m 0755 pam_cap.so $(FAKEROOT)$(LIBDIR)/security
 
 pam_cap.so: pam_cap.o
-	$(LD) $(LDFLAGS) -o pam_cap.so $< $(LDLIBS)
+	$(LD) $(CFLAGS) $(LDFLAGS) -o pam_cap.so $< $(LDLIBS)
 
 pam_cap.o: pam_cap.c
-	$(CC) $(CFLAGS) $(IPATH) -c $< -o $@
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
 testcompile: test.c pam_cap.o
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $+ -lpam -ldl $(LDLIBS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $+ -lpam -ldl $(LDLIBS)
 
 clean:
 	rm -f *.o *.so testcompile *~
diff --git a/progs/Makefile b/progs/Makefile
index c094a24..b9f0d3f 100644
--- a/progs/Makefile
+++ b/progs/Makefile
@@ -19,7 +19,7 @@ $(BUILD): %: %.o
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $< $(LDLIBS)
 
 %.o: %.c $(INCS)
-	$(CC) $(IPATH) $(CFLAGS) -c $< -o $@
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
 install: all
 	mkdir -p -m 0755 $(FAKEROOT)$(SBINDIR)
-- 
2.7.1