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LD_LIBRARY_PATH=
# test whether RUNPATH < LD_LIBRARY_PATH < RPATH
# the exe's both need libb.so, but there are two of those:
# ./dir/libb.so needs liba.so
# ./libb.so needs nothing.
.PHONY: clean
all: check
dir:
mkdir $@
dir/liba.so: dir
echo 'int a(){return 42;}' | $(CC) -shared -Wl,-soname,$(@F) -Wl,--no-as-needed -o $@ -nostdlib -x c -
dir/libb.so: dir/liba.so
echo 'int b(){return a();}' | $(CC) -shared -Wl,-soname,$(@F) -Wl,--no-as-needed -Wl,--disable-new-dtags '-Wl,-rpath,$$ORIGIN' -Wno-implicit-function-declaration -o $@ -nostdlib dir/liba.so -x c -
libb.so:
echo 'int b(){return 10;}' | $(CC) -shared -Wl,-soname,$(@F) -Wl,--no-as-needed -o $@ -Wno-implicit-function-declaration -nostdlib -x c -
exe_rpath: libb.so
echo 'int _start(){return b();}' | $(CC) -Wl,--no-as-needed -Wl,--disable-new-dtags "-Wl,-rpath,$(CURDIR)" libb.so -o $@ -Wno-implicit-function-declaration -nostdlib -x c -
exe_runpath: libb.so
echo 'int _start(){return b();}' | $(CC) -Wl,--no-as-needed -Wl,--enable-new-dtags "-Wl,-rpath,$(CURDIR)" libb.so -o $@ -Wno-implicit-function-declaration -nostdlib -x c -
check: exe_rpath exe_runpath dir/libb.so
../../libtree exe_rpath
LD_LIBRARY_PATH="$(CURDIR)/dir" ../../libtree exe_rpath
../../libtree exe_runpath
LD_LIBRARY_PATH="$(CURDIR)/dir" ../../libtree exe_runpath
clean:
rm -rf *.so dir exe*
CURDIR ?= $(.CURDIR)
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