gcc/libgfortran/config/t-nvptx

# Re 'alloca' usage in '../caf/single.c':
AM_CFLAGS += -mfake-ptx-alloca
nvptx: Build libgfortran with '-mfake-ptx-alloca' [PR107635] As of recent commit 8bf0ee8d62b8a08e808344d31354ab713157e15d "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. 2025-02-25 22:31:25 +01:00			`# Re 'alloca' usage in '../caf/single.c':`
			`AM_CFLAGS += -mfake-ptx-alloca`