On 27/02/17 13:40, jan.som...@dlr.de wrote:
Hello,
I tried compiling the RTEMS with fortran support for the Leon2/3 processors.
Building the cross-compiler with gfortran and the bsp worked both fine (I set
the bsp to compile with --mhard-float).
A small example program for the Leon3 compiles and runs as expected, however
for the leon2 I ran into a weird problem.
The linking of the example program fails with:
sparc-rtems4.12-gcc -B../../../../../leon2/lib/ -specs bsp_specs -qrtems
-mcpu=cypress -mhard-float -O2 -g -ffunction-sections -fdata-sections -Wall
-Wmissing-prototypes -Wimplicit-function-declaration -Wstrict-prototypes
-Wnested-externs -Wl,--gc-sections -mcpu=cypress -mhard-float -o ticker.exe
init.o tasks.o
-L/localdata/somm_ja/rtems-fortran/install/bsps/4.12/sparc/sparc-rtems4.12/leon2/lib/
-llapack -lrefblas -ltmglib -lcblas -lm -lgfortran -lgcc
/localdata/somm_ja/rtems-fortran/install/tools/4.12/sparc/lib/gcc/sparc-rtems4.12/6.3.0/libgfortran.a(elf.o):
In function `backtrace_initialize':
/localdata/somm_ja/rtems-fortran/rtems-source-builder/rtems/build/sparc-rtems4.12-gcc-6.3.0-newlib-2.5.0-x86_64-linux-gnu-1/build/sparc-rtems4.12/libbacktrace/../../../gcc-6.3.0/libbacktrace/elf.c:960:
undefined reference to `__sync_bool_compare_and_swap_4'
/localdata/somm_ja/rtems-fortran/install/tools/4.12/sparc/lib/gcc/sparc-rtems4.12/6.3.0/libgfortran.a(elf.o):
In function `elf_add_syminfo_data':
/localdata/somm_ja/rtems-fortran/rtems-source-builder/rtems/build/sparc-rtems4.12-gcc-6.3.0-newlib-2.5.0-x86_64-linux-gnu-1/build/sparc-rtems4.12/libbacktrace/../../../gcc-6.3.0/libbacktrace/elf.c:456:
undefined reference to `__sync_bool_compare_and_swap_4'
/localdata/somm_ja/rtems-fortran/install/tools/4.12/sparc/lib/gcc/sparc-rtems4.12/6.3.0/libgfortran.a(dwarf.o):
In function `backtrace_dwarf_add':
/localdata/somm_ja/rtems-fortran/rtems-source-builder/rtems/build/sparc-rtems4.12-gcc-6.3.0-newlib-2.5.0-x86_64-linux-gnu-1/build/sparc-rtems4.12/libbacktrace/../../../gcc-6.3.0/libbacktrace/dwarf.c:3030:
undefined reference to `__sync_bool_compare_and_swap_4'
collect2: error: ld returned 1 exit status
Makefile:627: recipe for target 'ticker.exe' failed
make: *** [ticker.exe] Error 1
If I check the different libgfortran.a libraries of sparc-rtems4.12/6.3.0 with
nm I get
libgfortran.a
U __sync_bool_compare_and_swap_4
U __sync_bool_compare_and_swap_4
Is this reference generated by the compiler or some GCC runtime source
code? The atomic operations are implemented via the libatomic, so you
should only have __atomic_() references.
for the ones in the leon, soft and v8 directory.
The libgfortran.a in the leon3 and leon3v7 directory do not have this
undefined symbol.
They implement this atomic operation in hardware.
Is that correct behavior? If yes, which library do I need to add to the linker?
It is a compiler or GCC runtime configuration issue.
Best regards,
Jan
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
German Aerospace Center
Simulation and Software Technology | Software for Space Systems and Interactive
Visualization | Lilienthalplatz 7 | 38108 Braunschweig | Germany
Jan Sommer
Telephone +49 531 295-2494 | Telefax 0531 295-2767 | jan.som...@dlr.de
DLR.de/SC
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