[PATCH] libtests/dl06: Add -lm

Chris Johns chrisj at rtems.org
Mon Nov 9 22:42:22 UTC 2020

On 9/11/20 6:24 pm, Sebastian Huber wrote:
> On 09/11/2020 02:23, Chris Johns wrote:
>> On 3/11/20 3:39 am, Sebastian Huber wrote:
>>> There is probably something wrong with this test program.  If it is compiled
>>> without function/data sections, no optimization, and no linker garbage
>>> collection, then there is an undefined reference to atan2() and tan().
>> These symbols are referenced in the loaded module ...
>> https://git.rtems.org/rtems/tree/testsuites/libtests/dl06/dl06-o2.c
>> This test gets rtems-ld with the RAP format to collect the atan1 and tan code
>> into the loaded module. They should not be present in the base image. The libm
>> library is used because it is _not_ part of the standard libraries linked and is
>> available everywhere.
>>> Fix this issue by adding -lm.
>> Is the error linking the base kernel image or the RAP loadable module?
>> If it is the loadable module and this is how you add the libraries to be
>> searched to the rtems-ld command then the fix is needed and there is no problem.
>> If the error was in the base kernel image then I suggest something else is wrong
>> because those symbols should not be present in the base image. If the build
>> system can support options for just rtems-ld then adding it there would be good.
> The error is in this command:
> [4044/4050] Processing link:
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-o1.o
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-o2.o
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-tar.o
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/init.o
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl-load.o
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-sym.o ->
> build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06.exe
> 08:21:03 runner ['/build/rtems/6/bin/arm-rtems6-gcc', '-qnolinkcmds', '-T',
> 'linkcmds.realview_pbx_a9_qemu',
> '/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-o1.o',
> '/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-o2.o',

These should not be linked into the base image. They are in the RAP image in

> '/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-tar.o',
> '/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/init.o',
> '/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl-load.o',
> '/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-sym.o',
> '-o/home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06.exe',
> '-Wl,--wrap=printf', '-Wl,--wrap=puts', '-L.', '-lrtemscpu', '-lrtemsbsp',
> '-lrtemstest', '-qrtems', '-march=armv7-a', '-mthumb', '-mfpu=neon',
> '-mfloat-abi=hard', '-mtune=cortex-a9',
> '-L/home/EB/sebastian_h/git-rtems-6/bsps/arm/shared/start',
> '-L/home/EB/sebastian_h/git-rtems-6/bsps/arm/realview-pbx-a9/start']
> /build/rtems/6/lib/gcc/arm-rtems6/10.2.1/../../../../arm-rtems6/bin/ld:
> /home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-o2.o:
> in function `dl_o2_func2':
> /home/EB/sebastian_h/git-rtems-6/testsuites/libtests/dl06/dl06-o2.c:31:
> undefined reference to `atan2'
> /build/rtems/6/lib/gcc/arm-rtems6/10.2.1/../../../../arm-rtems6/bin/ld:
> /home/EB/sebastian_h/git-rtems-6/build/arm/realview_pbx_a9_qemu/testsuites/libtests/dl06/dl06-o2.o:
> in function `dl_o2_func3':
> /home/EB/sebastian_h/git-rtems-6/testsuites/libtests/dl06/dl06-o2.c:37:
> undefined reference to `tan'
> I used the following config.ini:
> [arm/realview_pbx_a9_qemu]
>> More of a concern is no error. I wonder if the code is being inlined when there
>> is FPU support. Maybe the test needs to create a library linking to it to be
>> more robust?
> Using these functions without -fno-builtin is not really robust.

Would adding a pragma for this option to dl06-o1.c and dl06-o2.c be acceptable
as a solution?


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