On Thu, May 12, 2022 at 5:41 PM Yosry Ahmed <yosryahmed@xxxxxxxxxx> wrote:
>
> bpf selftests can no longer be built with CFLAGS=-static with
> liburandom_read.so and its dependent target.
>
> Filter out -static for liburandom_read.so and its dependent target.
>
> Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
> ---
> tools/testing/selftests/bpf/Makefile | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 6bbc03161544..4eaefc187d5b 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -168,14 +168,17 @@ $(OUTPUT)/%:%.c
> $(call msg,BINARY,,$@)
> $(Q)$(LINK.c) $^ $(LDLIBS) -o $@
>
> +# If the tests are being built statically, exclude dynamic libraries defined
> +# in this Makefile and their dependencies.
> +DYNAMIC_CFLAGS := $(filter-out -static,$(CFLAGS))
I don't particularly like yet another CFLAGS global variable, but also
you are not filtering out -static from LDFLAGS, which would be
problematic if you try to do
make SAN_FLAGS=-static
which otherwise would work (and is probably better than overriding all of CFLAGS
How about something like this
diff --git a/tools/testing/selftests/bpf/Makefile
b/tools/testing/selftests/bpf/Makefile
index 6bbc03161544..2e8eddf240af 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -170,11 +170,11 @@ $(OUTPUT)/%:%.c
$(OUTPUT)/liburandom_read.so: urandom_read_lib1.c urandom_read_lib2.c
$(call msg,LIB,,$@)
- $(Q)$(CC) $(CFLAGS) -fPIC $(LDFLAGS) $^ $(LDLIBS) --shared -o $@
+ $(Q)$(CC) $(filter-out -static,$(CFLAGS) $(LDFLAGS)) $^
$(LDLIBS) -fPIC -shared -o $@
$(OUTPUT)/urandom_read: urandom_read.c urandom_read_aux.c
$(OUTPUT)/liburandom_read.so
$(call msg,BINARY,,$@)
- $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.c,$^) \
+ $(Q)$(CC) $(filter-out -static,$(CFLAGS) $(LDFLAGS)) $(filter %.c,$^) \
liburandom_read.so $(LDLIBS) \
-Wl,-rpath=. -Wl,--build-id=sha1 -o $@
?
But I also have a question, this leaves urandom_read relying on
system-wide shared libraries, isn't that still a problem for you? Or
you intend to just ignore urandom_read-related tests?
$ ldd urandom_read
linux-vdso.so.1 (0x00007ffd0d5e5000)
liburandom_read.so (0x00007fc7f7d76000)
libelf.so.1 => /lib64/libelf.so.1 (0x00007fc7f7937000)
libz.so.1 => /lib64/libz.so.1 (0x00007fc7f7720000)
librt.so.1 => /lib64/librt.so.1 (0x00007fc7f7518000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc7f72f8000)
libc.so.6 => /lib64/libc.so.6 (0x00007fc7f6f33000)
/lib64/ld-linux-x86-64.so.2 (0x00007fc7f7b50000)
> $(OUTPUT)/liburandom_read.so: urandom_read_lib1.c urandom_read_lib2.c
> $(call msg,LIB,,$@)
> - $(Q)$(CC) $(CFLAGS) -fPIC $(LDFLAGS) $^ $(LDLIBS) --shared -o $@
> + $(Q)$(CC) $(DYNAMIC_CFLAGS) -fPIC $(LDFLAGS) $^ $(LDLIBS) --shared -o $@
>
> $(OUTPUT)/urandom_read: urandom_read.c urandom_read_aux.c $(OUTPUT)/liburandom_read.so
> $(call msg,BINARY,,$@)
> - $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.c,$^) \
> - liburandom_read.so $(LDLIBS) \
> + $(Q)$(CC) $(DYNAMIC_CFLAGS) $(LDFLAGS) $(filter %.c,$^) \
> + liburandom_read.so $(LDLIBS) \
> -Wl,-rpath=. -Wl,--build-id=sha1 -o $@
>
> $(OUTPUT)/bpf_testmod.ko: $(VMLINUX_BTF) $(wildcard bpf_testmod/Makefile bpf_testmod/*.[ch])
> --
> 2.36.0.550.gb090851708-goog
>
