Re: [PATCH] Force DT_RPATH for --enable-hardcoded-path-in-tests

["H.J. Lu" <hjl.tools@gmail.com>]

On Thu, May 9, 2024 at 8:56 PM Sunil Pandey <skpgkp2@gmail.com> wrote:
>
>
>
> On Thu, May 9, 2024 at 8:07 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>>
>> On Fedora 40/x86-64, linker enables --enable-new-dtags by default which
>> generates DT_RUNPATH instead of DT_RPATH.  Unlike DT_RPATH, DT_RUNPATH
>> only applies to DT_NEEDED entries in the executable and doesn't applies
>> to DT_NEEDED entries in shared libraries which are loaded via DT_NEEDED
>> entries in the executable.  Some glibc tests have libstdc++.so.6 in
>> DT_NEEDED, which has libm.so.6 in DT_NEEDED.  When DT_RUNPATH is generated,
>> /lib64/libm.so.6 is loaded for such tests.  If the newly built glibc is
>> older than glibc 2.36, these tests fail with
>>
>> assert/tst-assert-c++: /export/build/gnu/tools-build/glibc-gitlab-release/build-x86_64-linux/libc.so.6: version `GLIBC_2.36' not found (required by /lib64/libm.so.6)
>> assert/tst-assert-c++: /export/build/gnu/tools-build/glibc-gitlab-release/build-x86_64-linux/libc.so.6: version `GLIBC_ABI_DT_RELR' not found (required by /lib64/libm.so.6)
>>
>> Pass -Wl,--disable-new-dtags to linker when building glibc tests with
>> --enable-hardcoded-path-in-tests.  This fixes BZ #31719.
>>
>> Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
>> ---
>>  Makeconfig | 9 ++++++---
>>  1 file changed, 6 insertions(+), 3 deletions(-)
>>
>> diff --git a/Makeconfig b/Makeconfig
>> index 61ff1d0d9b..59e21d4c82 100644
>> --- a/Makeconfig
>> +++ b/Makeconfig
>> @@ -607,10 +607,13 @@ link-libc-rpath-link = -Wl,-rpath-link=$(rpath-link)
>>  # before the expansion of LDLIBS-* variables).
>>
>>  # Tests use -Wl,-rpath instead of -Wl,-rpath-link for
>> -# build-hardcoded-path-in-tests.
>> +# build-hardcoded-path-in-tests.  Add -Wl,--disable-new-dtags to force
>> +# DT_RPATH instead of DT_RUNPATH which only applies to DT_NEEDED entries
>> +# in the executable and doesn't applies to DT_NEEDED entries in shared
>> +# libraries which are loaded via DT_NEEDED entries in the executable.
>>  ifeq (yes,$(build-hardcoded-path-in-tests))
>> -link-libc-tests-rpath-link = $(link-libc-rpath)
>> -link-test-modules-rpath-link = $(link-libc-rpath)
>> +link-libc-tests-rpath-link = $(link-libc-rpath) -Wl,--disable-new-dtags
>> +link-test-modules-rpath-link = $(link-libc-rpath) -Wl,--disable-new-dtags
>>  else
>>  link-libc-tests-rpath-link = $(link-libc-rpath-link)
>>  link-test-modules-rpath-link =
>> --
>> 2.45.0
>>
>
> I would like to backport this patch to release branches up to 2.28.
> Any comments or objections?
>

OK.

-- 
H.J.