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linux: Enable PIE

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PIE (position-independent executables) is a security feature
that has been made reasonably cheap by recent improvements in
GCC; as a result, more and more Linux distributions are pushing
for its adoption.

Unfortunately, PIE and PIC are not compatible, so we have to
manage the CFLAGS and LDFLAGS used to compile the library and
the executable indipendently.
This commit is contained in:
Andrea Bolognani 2016-07-31 18:56:27 +02:00
parent 2c2034e3bf
commit 092e5c269f
1 changed files with 9 additions and 5 deletions
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14
linux/Makefile
View file

@ -17,27 +17,31 @@ ifneq ("${BUILDVERSION}", "")
MAINT_CPPFLAGS += -DSPECTRWM_BUILDSTR=\"$(BUILDVERSION)\"
endif
BIN_CFLAGS = -fPIE
BIN_LDFLAGS = -fPIE -pie
BIN_CPPFLAGS = $(shell pkg-config --cflags x11 x11-xcb xcb-icccm xcb-keysyms xcb-randr xcb-util xcb-xtest xcursor xft)
BIN_LDLIBS = $(shell pkg-config --libs x11 x11-xcb xcb-icccm xcb-keysyms xcb-randr xcb-util xcb-xtest xcursor xft)
LIB_CFLAGS = -fPIC
LIB_LDFLAGS = -fPIC -shared
LIB_CPPFLAGS = $(shell pkg-config --cflags x11)
LIB_LDLIBS = $(shell pkg-config --libs x11) -ldl
all: spectrwm libswmhack.so.$(LIBVERSION)
spectrwm: spectrwm.o linux.o
$(CC) $(MAINT_LDFLAGS) $(LDFLAGS) -o $@ $+ $(BIN_LDLIBS) $(LDLIBS)
$(CC) $(MAINT_LDFLAGS) $(BIN_LDFLAGS) $(LDFLAGS) -o $@ $+ $(BIN_LDLIBS) $(LDLIBS)
spectrwm.o: ../spectrwm.c ../version.h tree.h util.h
$(CC) $(MAINT_CFLAGS) $(CFLAGS) $(MAINT_CPPFLAGS) $(BIN_CPPFLAGS) $(CPPFLAGS) -c -o $@ $<
$(CC) $(MAINT_CFLAGS) $(BIN_CFLAGS) $(CFLAGS) $(MAINT_CPPFLAGS) $(BIN_CPPFLAGS) $(CPPFLAGS) -c -o $@ $<
linux.o: linux.c util.h
$(CC) $(MAINT_CFLAGS) $(CFLAGS) $(MAINT_CPPFLAGS) $(BIN_CPPFLAGS) $(CPPFLAGS) -c -o $@ $<
$(CC) $(MAINT_CFLAGS) $(BIN_CFLAGS) $(CFLAGS) $(MAINT_CPPFLAGS) $(BIN_CPPFLAGS) $(CPPFLAGS) -c -o $@ $<
libswmhack.so.$(LIBVERSION): swm_hack.so
$(CC) $(MAINT_LDFLAGS) $(LDFLAGS) -Wl,-soname,$@ -shared -fPIC -o $@ $+ $(LIB_LDLIBS) $(LDLIBS)
$(CC) $(MAINT_LDFLAGS) $(LIB_LDFLAGS) $(LDFLAGS) -Wl,-soname,$@ -o $@ $+ $(LIB_LDLIBS) $(LDLIBS)
swm_hack.so: ../lib/swm_hack.c
$(CC) $(MAINT_CFLAGS) $(CFLAGS) $(MAINT_CPPFLAGS) $(LIB_CPPFLAGS) $(CPPFLAGS) -fPIC -c -o $@ $<
$(CC) $(MAINT_CFLAGS) $(LIB_CFLAGS) $(CFLAGS) $(MAINT_CPPFLAGS) $(LIB_CPPFLAGS) $(CPPFLAGS) -c -o $@ $<
clean:
rm -f spectrwm *.o libswmhack.so.* *.so