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# Copyright (c) 2020 Johannes Stoelp
COMMON_CFLAGS := -g -O0 -Wall -Wextra \
-I../lib/include \
-nostartfiles -nodefaultlibs
run: main
./$<
# Build the example user program.
#
# We explicitly set the dynamic linker to `dynld.so` and use the ELF hash table
# (DT_HASH), as we didn't implement support for the GNU hash table in our
# dynamic linker.
main: dynld.so libgreet.so main.c ../lib/libcommon.a
gcc -o $@ \
$(COMMON_CFLAGS) \
-L$(CURDIR) -lgreet \
-Wl,--dynamic-linker=$(CURDIR)/dynld.so \
-Wl,--hash-style=sysv \
-no-pie \
$(filter %.c %.a, $^)
#readelf -W --dynamic $@
#readelf -W --program-headers $@
#objdump --disassemble -j .plt -M intel $@
#objdump --disassemble=_start -M intel $@
# Build the example shared library.
#
# We explicitly use the ELF hash table (DT_HASH), as we didn't implement
# support for the GNU hash table in our dynamic linker.
libgreet.so: libgreet.c
gcc -o $@ \
$(COMMON_CFLAGS) \
-fPIC -shared \
-Wl,--hash-style=sysv \
$^
# Build the dynamic linker.
#
# We assert that the dynamic linker doesn't contain any relocations as we
# didn't implement support to resolve its own relocations.
dynld.so: dynld.S dynld.c ../lib/libcommon.a
gcc -o $@ \
$(COMMON_CFLAGS) \
-fPIC -static-pie \
-fvisibility=hidden \
-Wl,--entry=dl_start \
-Wl,--no-allow-shlib-undefined \
$^
@if ! readelf -r $@ | grep 'There are no relocations in this file' >& /dev/null; then \
echo "ERROR: $@ contains relocations while we don't support relocations in $@!"; \
exit 1; \
fi
../lib/libcommon.a:
make -C ../lib
clean:
rm -f main libgreet.so
rm -f dynld.so
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