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nvptx: Build libgfortran with '-mfake-ptx-alloca' [PR107635]

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As of recent commit 8bf0ee8d62
"Fortran: Add transfer_between_remotes [PR107635]", we've got 'alloca' usage
in 'libgfortran/caf/single.c:_gfortran_caf_transfer_between_remotes', and
the libgfortran target library fails to build for legacy configurations where
PTX 'alloca' is not available:

    ../../../../source-gcc/libgfortran/caf/single.c: In function ‘_gfortran_caf_transfer_between_remotes’:
    ../../../../source-gcc/libgfortran/caf/single.c:675:23: sorry, unimplemented: dynamic stack allocation not supported
      675 |       transfer_desc = __builtin_alloca (desc_size);
          |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ../../../../source-gcc/libgfortran/caf/single.c:680:20: sorry, unimplemented: dynamic stack allocation not supported
      680 |     transfer_ptr = __builtin_alloca (*opt_dst_charlen * src_size);
          |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    make[6]: *** [Makefile:4675: caf/single.lo] Error 1

With '-mfake-ptx-alloca', libgfortran again succeeds to build, and compared
to before, we've got only a small number of regressions due to nvptx 'ld'
complaining about 'unresolved symbol __GCC_nvptx__PTX_alloca_not_supported':

    [-PASS:-]{+FAIL:+} gfortran.dg/coarray/codimension_2.f90 -fcoarray=lib  -O2  -lcaf_single (test for excess errors)

    [-PASS:-]{+FAIL:+} gfortran.dg/coarray/event_4.f08 -fcoarray=lib  -O2  -lcaf_single (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} gfortran.dg/coarray/event_4.f08 -fcoarray=lib  -O2  -lcaf_single [-execution test-]{+compilation failed to produce executable+}

    [-PASS:-]{+FAIL:+} gfortran.dg/coarray/fail_image_2.f08 -fcoarray=lib  -O2  -lcaf_single (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} gfortran.dg/coarray/fail_image_2.f08 -fcoarray=lib  -O2  -lcaf_single [-execution test-]{+compilation failed to produce executable+}

    [-PASS:-]{+FAIL:+} gfortran.dg/coarray/proc_pointer_assign_1.f90 -fcoarray=lib  -O2  -lcaf_single (test for excess errors)
    [-PASS:-]{+UNRESOLVED:+} gfortran.dg/coarray/proc_pointer_assign_1.f90 -fcoarray=lib  -O2  -lcaf_single [-execution test-]{+compilation failed to produce executable+}

    [-PASS:-]{+FAIL:+} gfortran.dg/coarray_43.f90   -O  (test for excess errors)

That's acceptable for such legacy PTX configurations.

	PR target/107635
	libgfortran/
	* config/t-nvptx: New.
	* configure.host [nvptx] (tmake_file): Add it.
This commit is contained in:
Thomas Schwinge 2025-02-25 22:31:25 +01:00
parent 1146410c0f
commit bac2d8a246
2 changed files with 6 additions and 0 deletions
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2
libgfortran/config/t-nvptx Normal file
View file

@ -0,0 +1,2 @@
# Re 'alloca' usage in '../caf/single.c':
AM_CFLAGS += -mfake-ptx-alloca

4
libgfortran/configure.host
View file

@ -91,6 +91,10 @@ case "${target}" in
tmake_file="t-aix"
;;
nvptx-*-none)
tmake_file="$tmake_file t-nvptx"
;;
*)
;;