https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116080
--- Comment #15 from Christophe Lyon <clyon at gcc dot gnu.org> ---
(In reply to andi from comment #14)
> The test relies on the
>
> gcc/testsuite/lib/target-supports.exp:check_effective_target_tail_call
Are you sure?
musttail7.c has:
/* { dg-do compile { target { musttail && { c || c++11 } } } } */
(so "musttail" and not "tail_call")
>
> probe matching what the test does. Perhaps the way you are passing options
> doesn't pass them to the TCL based test code? The probe should be in the
> logs,
> perhaps you can find that or upload them somewhere.
My log has:
spawn -ignore SIGHUP
/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/x86_64-pc-linux-gnu/bin/arm-eabi-g++
musttail19057.c -fdiagnostics-plain-output -nostdinc++
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/arm-eabi
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/libsupc++
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/include/backward
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/testsuite/util
-fmessage-length=0 -fdump-rtl-expand-all -Wno-complain-wrong-lang
-fdump-rtl-expand -S -o musttail19057.s
(with no error)
but for the actual testcase:
spawn -ignore SIGHUP
/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/destdir/x86_64-pc-linux-gnu/bin/arm-eabi-g++
/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/testsuite/c-c++-common/musttail7.c
-fdiagnostics-plain-output -nostdinc++
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/arm-eabi
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/libsupc++
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/include/backward
-I/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/testsuite/util
-fmessage-length=0 -std=c++11 -S -o musttail7.s
/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/testsuite/c-c++-common/musttail7.c:
In function 'void f2()':
/home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/testsuite/c-c++-common/musttail7.c:8:30:
error: cannot tail-call: target is not able to optimize the call into a sibling
call
