clang/flang-new compilation issues on Linux on loongarch64

[azuresky01]

Hello,

@XiWeiGu When I try to build OpenBLAS with clang/flang-new on Debian sid, I found compilation failed with both gmake and cmake. See below.

System details: Loongson 3A6000 CPU, Debian sid, kernel 6.11.0, clang 18.1.8, flang-new 18.1.8 (or clang 19.1.0 and flang-new 19.1.0), cmake 3.30.3.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

gmake:

building command: CC=clang-18 FC=flang-new-18 make

result:

...
make[1]: Entering directory '/home/loongson/test/build_OpenBLAS/kernel'
make[1]: warning: -j8 forced in makefile: resetting jobserver mode.
clang-18 -c -O2 -DSMALL_MATRIX_OPT -DMAX_STACK_ALLOC=2048 -Wall -march=loongarch64 -mabi=lp64d -DF_INTERFACE_GFORT -fPIC -DSMP_SERVER -DNO_WARMUP -DMAX_CPU_NUMBER=8 -DMAX_PARALLEL_NUMBER=1 -DBUILD_SINGLE=1 -DBUILD_DOUBLE=1 -DBUILD_COMPLEX=1 -DBUILD_COMPLEX16=1 -DVERSION=\"0.3.28.dev\" -UASMNAME -UASMFNAME -UNAME -UCNAME -UCHAR_NAME -UCHAR_CNAME -DASMNAME=samax_k -DASMFNAME=samax_k_ -DNAME=samax_k_ -DCNAME=samax_k -DCHAR_NAME=\"samax_k_\" -DCHAR_CNAME=\"samax_k\" -DNO_AFFINITY -I.. -UDOUBLE  -UCOMPLEX -UCOMPLEX -UDOUBLE  -DUSE_ABS -UUSE_MIN ../kernel/loongarch64/amax_lasx.S -o samax_k.o
../kernel/loongarch64/amax_lasx.S:232:10: error: expected newline
    .end samax_k ; .section .note.GNU-stack,"",@progbits
         ^
make[1]: *** [Makefile.L1:556: samax_k.o] Error 1
make[1]: Leaving directory '/home/loongson/test/build_OpenBLAS/kernel'
make: *** [Makefile:199: libs] Error 1

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

cmake:

building commands: CC=clang-18 FC=flang-new-18 cmake -B build and then cmake --build build

result:

[  0%] Building Fortran object CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/la_constants.f90.o
flang-new: error: unknown argument: '-mabi=lp64d'
flang-new: error: unknown argument: '-mabi=lp64d'
gmake[2]: *** [CMakeFiles/LAPACK_OVERRIDES.dir/build.make:5548: CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/la_constants.f90.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:378: CMakeFiles/LAPACK_OVERRIDES.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2

if replace flang-new-18 with gfortran, the result is:

...
[ 77%] Building C object driver/others/CMakeFiles/driver_others.dir/parameter.c.o
[ 77%] Built target driver_others
[ 77%] Building C object kernel/CMakeFiles/kernel.dir/CMakeFiles/lsame.c.o
[ 77%] Building C object kernel/CMakeFiles/kernel.dir/CMakeFiles/scabs1.c.o
[ 77%] Building C object kernel/CMakeFiles/kernel.dir/CMakeFiles/dcabs1.c.o
[ 77%] Building ASM object kernel/CMakeFiles/kernel.dir/CMakeFiles/samax_k.S.o
/home/loongson/test/build_OpenBLAS/kernel/loongarch64/amax_lasx.S:232:10: error: expected newline
    .end samax_k ; .section .note.GNU-stack,"",@progbits
         ^
gmake[2]: *** [kernel/CMakeFiles/kernel.dir/build.make:117: kernel/CMakeFiles/kernel.dir/CMakeFiles/samax_k.S.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:594: kernel/CMakeFiles/kernel.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2

[XiWeiGu]

Thank you for your testing. I will set up the environment promptly to reproduce the issue.

[azuresky01]

Update with correction:

According to the reference here: https://flang.llvm.org/docs/FlangCommandLineReference.html, there is no "-mabi=%" flag for flang-new.

Following a recent PR #4899, I tried to add " -mabi=% " flag to the filter-out list at lines 1723-1724 in the file Makefile.system:

OpenBLAS/Makefile.system

Lines 1722 to 1724 in f10d47c

	ifeq ($(F_COMPILER),FLANGNEW)
	LAPACK_FFLAGS := $(filter-out -m32 -m64 -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 -mtune=% ,$(FFLAGS))
	override FFLAGS := $(filter-out -m32 -m64 -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 -mtune=% ,$(FFLAGS))

This fixes " flang-new: error: unknown argument: '-mabi=lp64d' " issue for gmake.

However, now I observe two FORTRAN programs slacon.f and slacn2.f fail and the compilation stops:

...
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slabrd.o slabrd.f
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slacon.o slacon.f
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slacn2.o slacn2.f
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slaein.o slaein.f
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slaexc.o slaexc.f
LLVM ERROR: Do not know how to promote this operator!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /usr/lib/llvm-18/bin/flang-new -fc1 -triple loongarch64-unknown-linux-gnu -emit-obj -fcolor-diagnostics -mrelocation-model pic -pic-level 2 -target-cpu loongarch64 -mframe-pointer=none -O2 -o slacon.o -x f95-cpp-input slacon.f
1.	Running pass 'Function Pass Manager' on module 'FIRModule'.
2.	Running pass 'LoongArch DAG->DAG Pattern Instruction Selection' on function '@slacon_'
LLVM ERROR: Do not know how to promote this operator!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /usr/lib/llvm-18/bin/flang-new -fc1 -triple loongarch64-unknown-linux-gnu -emit-obj -fcolor-diagnostics -mrelocation-model pic -pic-level 2 -target-cpu loongarch64 -mframe-pointer=none -O2 -o slacn2.o -x f95-cpp-input slacn2.f
1.	Running pass 'Function Pass Manager' on module 'FIRModule'.
2.	Running pass 'LoongArch DAG->DAG Pattern Instruction Selection' on function '@slacn2_'
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slag2.o slag2.f
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slags2.o slags2.f
 #0 0x00007fffe6df3980 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf3980)
 #1 0x00007fffe6df1854 llvm::sys::RunSignalHandlers() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf1854)
 #2 0x00007fffe6df41e0 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf41e0)
 #3 0x00007ffffe5c4910 (linux-vdso.so.1+0x910)
 #4 0x00007ffff2ddb700 __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x00007ffff2d87d3c raise ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x00007ffff2d7123c abort ./stdlib/abort.c:81:7
 #7 0x00007fffe6d373dc llvm::report_fatal_error(llvm::Twine const&, bool) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xd373dc)
 #8 0x00007fffe6d3720c (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xd3720c)
 #9 0x00007fffe755b2c8 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x155b2c8)
#10 0x00007fffe7581768 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1581768)
#11 0x00007fffe7586570 llvm::SelectionDAG::LegalizeTypes() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1586570)
#12 0x00007fffe7676f88 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1676f88)
#13 0x00007fffe76767c4 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x16767c4)
#14 0x00007fffe767490c llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x167490c)
#15 0x00007fffe71ee0b8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x11ee0b8)
#16 0x00007fffe6f6164c llvm::FPPassManager::runOnFunction(llvm::Function&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf6164c)
#17 0x00007fffe6f67864 llvm::FPPassManager::runOnModule(llvm::Module&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf67864)
#18 0x00007fffe6f61cac llvm::legacy::PassManagerImpl::run(llvm::Module&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf61cac)
#19 0x0000555557a8b1e0 Fortran::frontend::CodeGenAction::executeAction() (/usr/lib/llvm-18/bin/flang-new+0xc071e0)
#20 0x0000555557a7e6c0 Fortran::frontend::FrontendAction::execute() (/usr/lib/llvm-18/bin/flang-new+0xbfa6c0)
#21 0x0000555557a6d0f0 Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&) (/usr/lib/llvm-18/bin/flang-new+0xbe90f0)
#22 0x0000555557a82610 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/usr/lib/llvm-18/bin/flang-new+0xbfe610)
#23 0x0000555557a6bb40 fc1_main(llvm::ArrayRef<char const*>, char const*) (/usr/lib/llvm-18/bin/flang-new+0xbe7b40)
#24 0x0000555557a6a718 main (/usr/lib/llvm-18/bin/flang-new+0xbe6718)
#25 0x00007ffff2d718b0 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#26 0x00007ffff2d71998 call_init ./csu/../csu/libc-start.c:128:20
#27 0x00007ffff2d71998 __libc_start_main ./csu/../csu/libc-start.c:347:5
#28 0x0000555557a6a0e8 _start (/usr/lib/llvm-18/bin/flang-new+0xbe60e8)
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slagtm.o slagtm.f
 #0 0x00007fffe6df3980 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf3980)
 #1 0x00007fffe6df1854 llvm::sys::RunSignalHandlers() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf1854)
 #2 0x00007fffe6df41e0 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf41e0)
 #3 0x00007ffffd774910 (linux-vdso.so.1+0x910)
 #4 0x00007ffff375f700 __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x00007ffff370bd3c raise ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x00007ffff36f523c abort ./stdlib/abort.c:81:7
 #7 0x00007fffe6d373dc llvm::report_fatal_error(llvm::Twine const&, bool) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xd373dc)
 #8 0x00007fffe6d3720c (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xd3720c)
 #9 0x00007fffe755b2c8 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x155b2c8)
#10 0x00007fffe7581768 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1581768)
#11 0x00007fffe7586570 llvm::SelectionDAG::LegalizeTypes() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1586570)
#12 0x00007fffe7676f88 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1676f88)
#13 0x00007fffe76767c4 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x16767c4)
#14 0x00007fffe767490c llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x167490c)
#15 0x00007fffe71ee0b8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x11ee0b8)
#16 0x00007fffe6f6164c llvm::FPPassManager::runOnFunction(llvm::Function&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf6164c)
#17 0x00007fffe6f67864 llvm::FPPassManager::runOnModule(llvm::Module&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf67864)
#18 0x00007fffe6f61cac llvm::legacy::PassManagerImpl::run(llvm::Module&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf61cac)
#19 0x000055555810f1e0 Fortran::frontend::CodeGenAction::executeAction() (/usr/lib/llvm-18/bin/flang-new+0xc071e0)
#20 0x00005555581026c0 Fortran::frontend::FrontendAction::execute() (/usr/lib/llvm-18/bin/flang-new+0xbfa6c0)
#21 0x00005555580f10f0 Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&) (/usr/lib/llvm-18/bin/flang-new+0xbe90f0)
#22 0x0000555558106610 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/usr/lib/llvm-18/bin/flang-new+0xbfe610)
#23 0x00005555580efb40 fc1_main(llvm::ArrayRef<char const*>, char const*) (/usr/lib/llvm-18/bin/flang-new+0xbe7b40)
#24 0x00005555580ee718 main (/usr/lib/llvm-18/bin/flang-new+0xbe6718)
#25 0x00007ffff36f58b0 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#26 0x00007ffff36f5998 call_init ./csu/../csu/libc-start.c:128:20
#27 0x00007ffff36f5998 __libc_start_main ./csu/../csu/libc-start.c:347:5
#28 0x00005555580ee0e8 _start (/usr/lib/llvm-18/bin/flang-new+0xbe60e8)
flang-new-18 -O2 -march=loongarch64 -fPIC -c -o slagv2.o slagv2.f
flang-new: error: unable to execute command: Aborted (core dumped)
flang-new: error: flang frontend command failed due to signal (use -v to see invocation)
Debian flang-new version 18.1.8 (11)
Target: loongarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-18/bin
flang-new: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
flang-new: note: diagnostic msg: /tmp/slacon-dda0eb
flang-new: note: diagnostic msg: /tmp/slacon-dda0eb.sh
flang-new: note: diagnostic msg: 

********************
make[2]: *** [Makefile:66: slacon.o] Error 254
make[2]: *** Waiting for unfinished jobs....
flang-new: error: unable to execute command: Aborted (core dumped)
flang-new: error: flang frontend command failed due to signal (use -v to see invocation)
Debian flang-new version 18.1.8 (11)
Target: loongarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-18/bin
flang-new: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
flang-new: note: diagnostic msg: /tmp/slacn2-0db7ef
flang-new: note: diagnostic msg: /tmp/slacn2-0db7ef.sh
flang-new: note: diagnostic msg: 

********************
make[2]: *** [Makefile:66: slacn2.o] Error 254
make[2]: Leaving directory '/home/loongson/test/ttt/lapack-netlib/SRC'
make[1]: *** [Makefile:27: lapacklib] Error 2
make[1]: Leaving directory '/home/loongson/test/ttt/lapack-netlib'
make: *** [Makefile:291: netlib] Error 2

Check the attachment for the msg files.

#########################################################

For cmake, following PR #4569, I tried to add some lines in the file cmake/fc.cmake to avoid adding "-mabi=%" flag when the compiler is llvm.

The original related part is here:

OpenBLAS/cmake/fc.cmake

Lines 62 to 80 in edaf593

	if (LOONGARCH64)
	if (BINARY64)
	CHECK_C_COMPILER_FLAG("-mabi=lp64d" COMPILER_SUPPORT_LP64D_ABI)
	if(COMPILER_SUPPORT_LP64D_ABI)
	set(FCOMMON_OPT "${FCOMMON_OPT} -mabi=lp64d")
	else()
	set(FCOMMON_OPT "${FCOMMON_OPT} -mabi=lp64")
	endif ()
	if (INTERFACE64)
	set(FCOMMON_OPT "${FCOMMON_OPT} -fdefault-integer-8")
	endif ()
	else ()
	CHECK_C_COMPILER_FLAG("-mabi=ilp32d" COMPILER_SUPPORT_ILP32D_ABI)
	if(COMPILER_SUPPORT_ILP32D_ABI)
	set(FCOMMON_OPT "${FCOMMON_OPT} -mabi=ilp32d")
	else()
	set(FCOMMON_OPT "${FCOMMON_OPT} -mabi=lp32")
	endif ()
	endif ()

The fix:

add one line before lines 64 and 74:

if (NOT CMAKE_Fortran_COMPILER_ID MATCHES "LLVMFlang.*")

and one line after lines 69 and 79:

endif ()

The above fixes " flang-new: error: unknown argument: '-mabi=lp64d' " issue for cmake. However, similarly I observe the FORTRAN program slacon.f fails and the compilation stops:

[  1%] Building Fortran object CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/shseqr.f.o
[  1%] Building Fortran object CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/slabrd.f.o
[  1%] Building Fortran object CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/slacon.f.o
LLVM ERROR: Do not know how to promote this operator!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /usr/lib/llvm-18/bin/flang-new -fc1 -triple loongarch64-unknown-linux-gnu -emit-obj -I /home/loongson/test/build-OpenBLAS-test-cmake/lapack-netlib/LAPACKE/include -fcolor-diagnostics -mrelocation-model pic -pic-level 2 -target-cpu loongarch64 -mframe-pointer=all -o CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/slacon.f.o -x f95-cpp-input /home/loongson/test/build-OpenBLAS-test-cmake/lapack-netlib/SRC/slacon.f
1.	Running pass 'Function Pass Manager' on module 'FIRModule'.
2.	Running pass 'LoongArch DAG->DAG Pattern Instruction Selection' on function '@slacon_'
 #0 0x00007fffe6df3980 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf3980)
 #1 0x00007fffe6df1854 llvm::sys::RunSignalHandlers() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf1854)
 #2 0x00007fffe6df41e0 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xdf41e0)
 #3 0x00007fffff814910 (linux-vdso.so.1+0x910)
 #4 0x00007ffff386f700 __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x00007ffff381bd3c raise ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x00007ffff380523c abort ./stdlib/abort.c:81:7
 #7 0x00007fffe6d373dc llvm::report_fatal_error(llvm::Twine const&, bool) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xd373dc)
 #8 0x00007fffe6d3720c (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xd3720c)
 #9 0x00007fffe755b2c8 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x155b2c8)
#10 0x00007fffe7581768 (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1581768)
#11 0x00007fffe7586570 llvm::SelectionDAG::LegalizeTypes() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1586570)
#12 0x00007fffe7676f88 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x1676f88)
#13 0x00007fffe76767c4 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x16767c4)
#14 0x00007fffe767490c llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x167490c)
#15 0x00007fffe71ee0b8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0x11ee0b8)
#16 0x00007fffe6f6164c llvm::FPPassManager::runOnFunction(llvm::Function&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf6164c)
#17 0x00007fffe6f67864 llvm::FPPassManager::runOnModule(llvm::Module&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf67864)
#18 0x00007fffe6f61cac llvm::legacy::PassManagerImpl::run(llvm::Module&) (/lib/loongarch64-linux-gnu/libLLVM-18.so.18.1+0xf61cac)
#19 0x0000555559f431e0 Fortran::frontend::CodeGenAction::executeAction() (/usr/lib/llvm-18/bin/flang-new+0xc071e0)
#20 0x0000555559f366c0 Fortran::frontend::FrontendAction::execute() (/usr/lib/llvm-18/bin/flang-new+0xbfa6c0)
#21 0x0000555559f250f0 Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&) (/usr/lib/llvm-18/bin/flang-new+0xbe90f0)
#22 0x0000555559f3a610 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/usr/lib/llvm-18/bin/flang-new+0xbfe610)
#23 0x0000555559f23b40 fc1_main(llvm::ArrayRef<char const*>, char const*) (/usr/lib/llvm-18/bin/flang-new+0xbe7b40)
#24 0x0000555559f22718 main (/usr/lib/llvm-18/bin/flang-new+0xbe6718)
#25 0x00007ffff38058b0 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#26 0x00007ffff3805998 call_init ./csu/../csu/libc-start.c:128:20
#27 0x00007ffff3805998 __libc_start_main ./csu/../csu/libc-start.c:347:5
#28 0x0000555559f220e8 _start (/usr/lib/llvm-18/bin/flang-new+0xbe60e8)
flang-new: error: unable to execute command: Aborted (core dumped)
flang-new: error: flang frontend command failed due to signal (use -v to see invocation)
Debian flang-new version 18.1.8 (11)
Target: loongarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-18/bin
flang-new: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
flang-new: note: diagnostic msg: /tmp/slacon-931c2e
flang-new: note: diagnostic msg: /tmp/slacon-931c2e.sh
flang-new: note: diagnostic msg: 

********************
gmake[2]: *** [CMakeFiles/LAPACK_OVERRIDES.dir/build.make:1024: CMakeFiles/LAPACK_OVERRIDES.dir/lapack-netlib/SRC/slacon.f.o] Error 254
gmake[1]: *** [CMakeFiles/Makefile2:378: CMakeFiles/LAPACK_OVERRIDES.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2

Check the attachment for the msg files.
slacon-dda0eb.zip

[martin-frbg]

Right, seems earlier versions of flang-new used to ignore any -m arguments without complaining, and now those generate an error. I have no idea however if/how flang-new is expected to react to the presence of multiple ABIs for a given target...

Regarding the other problem with clang, could you try changing the toplevel common_loongarch64.h
around line 280 where it currently has an unconditional

#define EPILOGUE      \
    .end    REALNAME ;\
    GNUSTACK

and make it read

#ifdef __clang__
#define EPILOGUE .end
#else
#define EPILOGUE      \
    .end    REALNAME ;\
    GNUSTACK
#endif

(assuming one does not need to use the GNUSTACK identifier to mark the stack as non-executable with clang - although maybe it would be necessary when expressly using GNU ld for linking)

[azuresky01]

Right, seems earlier versions of flang-new used to ignore any -m arguments without complaining, and now those generate an error. I have no idea however if/how flang-new is expected to react to the presence of multiple ABIs for a given target...

Regarding the other problem with clang, could you try changing the toplevel common_loongarch64.h around line 280 where it currently has an unconditional

#define EPILOGUE      \
    .end    REALNAME ;\
    GNUSTACK

and make it read

#ifdef __clang__
#define EPILOGUE .end
#else
#define EPILOGUE      \
    .end    REALNAME ;\
    GNUSTACK
#endif

(assuming one does not need to use the GNUSTACK identifier to mark the stack as non-executable with clang - although maybe it would be necessary when expressly using GNU ld for linking)

Thanks for your kind help. I confirm that your modification fixes clang errors.

[martin-frbg]

Great, thanks for the feedback. That leaves the compilation error in slacon.f, which appears to be an internal error in LLVM18. Maybe this is already fixed in the recently released 19.1 ?

[azuresky01]

Great, thanks for the feedback. That leaves the compilation error in slacon.f, which appears to be an internal error in LLVM18. Maybe this is already fixed in the recently released 19.1 ?

No. Current flang-new 19.1.1 still fails.

[martin-frbg]

Thanks, reported to llvm/llvm-project now

[azuresky01]

Update: I just tested both make and cmake compilation on loongarch64 with LLVM 20, it seems OK now.

System: Loongson 3A6000 CPU, AOSC OS (12.1.2), kernel 6.14.1, clang 20.1.2, flang-new 20.1.2, cmake 3.31.6.