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{ stdenv }:
# This tests that libraries listed in LD_LIBRARY_PATH take precedence over those listed in RPATH.
let
# A simple test library: libgreeting.so which exports a single function getGreeting() returning the good old hello greeting.
libgreeting = stdenv.mkDerivation {
name = "libgreeting";
code = ''
const char* getGreeting() { return "Hello, world!"; }
'';
unpackPhase = ''
echo "$code" > libgreeting.c
'';
installPhase = ''
mkdir -p $out/lib
$CC -c -fpic libgreeting.c
$CC -shared libgreeting.o -o $out/lib/libgreeting.so
'';
};
# A variant of libgreeting.so that returns a different message.
libgoodbye = libgreeting.overrideAttrs (_: {
name = "libgoodbye";
code = ''
const char* getGreeting() { return "Goodbye, world!"; }
'';
});
# A simple consumer of libgreeting.so that just prints the greeting to stdout.
testProgram = stdenv.mkDerivation {
name = "greeting-test";
buildInputs = [ libgreeting ];
code = ''
#include <stdio.h>
extern const char* getGreeting(void);
int main() {
puts(getGreeting());
}
'';
unpackPhase = ''
echo "$code" > greeting-test.c
'';
installPhase = ''
mkdir -p $out/bin
$CC -c greeting-test.c
$CC greeting-test.o -lgreeting -o $out/bin/greeting-test
# Now test the installed binaries right after compiling them. In particular,
# don't do this in installCheckPhase because fixupPhase has been run by then!
(
export PATH=$out/bin
set -x
# Verify that our unmodified binary works as expected.
[ "$(greeting-test)" = "Hello, world!" ]
# And finally, test that a library in LD_LIBRARY_PATH takes precedence over the linked-in library.
[ "$(LD_LIBRARY_PATH=${libgoodbye}/lib greeting-test)" = "Goodbye, world!" ]
)
'';
};
in stdenv.mkDerivation {
name = "test-LD_LIBRARY_PATH";
nativeBuildInputs = [ testProgram ];
buildCommand = ''
# And for good measure, repeat the tests again from a separate derivation,
# as fixupPhase done by the stdenv can (and has!) affect the result.
[ "$(greeting-test)" = "Hello, world!" ]
[ "$(LD_LIBRARY_PATH=${libgoodbye}/lib greeting-test)" = "Goodbye, world!" ]
touch $out
'';
meta.platforms = stdenv.lib.platforms.linux;
}
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