Building and testing compiler-rt builtins for riscv64-unknown-elf (original) (raw)
Hi, I’m trying to build and test the builtins part of compiler-rt for RISC-V using the following cmake cmake options:
export BUILD_C_FLAGS="--target=riscv64-unknown-elf -march=rv64gc --gcc-toolchain=$RISCV_GCC_TOOLCHAIN --sysroot=$RISCV_SYSROOT"
export TEST_C_FLAGS="$BUILD_C_FLAGS"
cmake $LLVM_SRC/compiler-rt \
-G "Ninja" \
-DCOMPILER_RT_OS_DIR="baremetal" \
-DCOMPILER_RT_BUILD_BUILTINS=ON \
-DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
-DCOMPILER_RT_BUILD_MEMPROF=OFF \
-DCOMPILER_RT_BUILD_PROFILE=OFF \
-DCOMPILER_RT_BUILD_SANITIZERS=OFF \
-DCOMPILER_RT_BUILD_XRAY=OFF \
-DCMAKE_C_COMPILER=$LLVM_BUILD/bin/clang \
-DCMAKE_C_COMPILER_TARGET="riscv64-unknown-elf" \
-DCMAKE_ASM_COMPILER_TARGET="riscv64-unknown-elf" \
-DCMAKE_AR=$LLVM_BUILD/bin/llvm-ar \
-DCMAKE_NM=$LLVM_BUILD/bin/llvm-nm \
-DCMAKE_RANLIB=$LLVM_BUILD/bin/llvm-ranlib \
-DCOMPILER_RT_BAREMETAL_BUILD=ON \
-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \
-DLLVM_CONFIG_PATH=$LLVM_BUILD/bin/llvm-config \
-DCMAKE_C_FLAGS="$BUILD_C_FLAGS" \
-DCMAKE_ASM_FLAGS="$BUILD_C_FLAGS" \
-DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
-DCOMPILER_RT_INCLUDE_TESTS=ON \
-DCOMPILER_RT_EMULATOR="qemu-riscv64 -L $RISCV_SYSROOT" \
-DCOMPILER_RT_TEST_COMPILER=$LLVM_BUILD/bin/clang \
-DCOMPILER_RT_TEST_COMPILER_CFLAGS="$TEST_C_FLAGS"
ninja builtin
ninja check-builtin
The builtin library libclang_rt.builtins-riscv64.a is successfuly built, but the tests are failed to built.
Use the test udivmodti4_test.c as an example, the command used for building and testing udivmodti4_test.c is:
clang -gline-tables-only --target=riscv64-unknown-elf -march=rv64gc --gcc-toolchain=/path/to/gcc-toolchain/ --sysroot=/path/to/sysroot/riscv64-unknown-elf/ -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta -fno-builtin -I <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>L</mi><mi>L</mi><mi>V</mi><msub><mi>M</mi><mi>S</mi></msub><mi>R</mi><mi>C</mi><mi mathvariant="normal">/</mi><mi>c</mi><mi>o</mi><mi>m</mi><mi>p</mi><mi>i</mi><mi>l</mi><mi>e</mi><mi>r</mi><mo>−</mo><mi>r</mi><mi>t</mi><mi mathvariant="normal">/</mi><mi>l</mi><mi>i</mi><mi>b</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>u</mi><mi>i</mi><mi>l</mi><mi>t</mi><mi>i</mi><mi>n</mi><mi>s</mi><mo>−</mo><mi>n</mi><mi>o</mi><mi>d</mi><mi>e</mi><mi>f</mi><mi>a</mi><mi>u</mi><mi>l</mi><mi>t</mi><mi>l</mi><mi>i</mi><mi>b</mi><mi>s</mi></mrow><annotation encoding="application/x-tex">LLVM_SRC/compiler-rt/lib/builtins -nodefaultlibs </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">LL</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.10903em;">M</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:-0.109em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.05764em;">S</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.07153em;">RC</span><span class="mord">/</span><span class="mord mathnormal">co</span><span class="mord mathnormal">m</span><span class="mord mathnormal">p</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">t</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">ib</span><span class="mord">/</span><span class="mord mathnormal">b</span><span class="mord mathnormal">u</span><span class="mord mathnormal">i</span><span class="mord mathnormal">lt</span><span class="mord mathnormal">in</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">n</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">a</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.01968em;">ltl</span><span class="mord mathnormal">ib</span><span class="mord mathnormal">s</span></span></span></span>LLVM_SRC/compiler-rt/test/builtins/Unit/udivmodti4_test.c /path/to/libclang_rt.builtins-riscv64.a -lc -lm -o udivmodti4_test.c.tmp && qemu-riscv64 -L $RISCV_SYSROOT udivmodti4_test.c.tmp
udivmodti4_test.c is failed to build because lots of undefined references, e.g. undefined reference to __multf3, _write …
- riscv64-unknown-elf-ld: riscv64-unknown-elf/lib/libc.a(lib_a-svfprintf.o): in function
.L244:
vfprintf.c:(.text._svfprintf_r+0x1664): undefined reference to__multf3 - riscv64-unknown-elf-ld: riscv64-unknown-elf/lib/libc.a(lib_a-writer.o): in function
_write_r:
writer.c:(.text._write_r+0x16): undefined reference to `_write’
libclang_rt.builtins-riscv64.a has the definition of __multf3
readelf -sW libclang_rt.builtins-riscv64.a | grep __multf3 shows:
85: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __multf3
40: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __multf3
82: 0000000000000002 56 FUNC GLOBAL HIDDEN 2 __multf3
12: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __multf3
I saw libgloss.a locates in riscv64-unknown-elf/lib/ has the symbol _write:
readelf -sW ~/opt/riscv/riscv64-unknown-elf/lib/libgloss.a | grep _write
1: 0000000000000000 0 FILE LOCAL DEFAULT ABS sys_write.c
11: 0000000000000000 48 FUNC GLOBAL DEFAULT 4 _write
If I manually add -lgloss /path/to/libclang_rt.builtins-riscv64.a after -lc -lm, then udivmodti4_test.c succeeds to build:
clang -gline-tables-only --target=riscv64-unknown-elf -march=rv64gc --gcc-toolchain=/path/to/gcc-toolchain/ --sysroot=/path/to/sysroot/riscv64-unknown-elf/ -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta -fno-builtin -I <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>L</mi><mi>L</mi><mi>V</mi><msub><mi>M</mi><mi>S</mi></msub><mi>R</mi><mi>C</mi><mi mathvariant="normal">/</mi><mi>c</mi><mi>o</mi><mi>m</mi><mi>p</mi><mi>i</mi><mi>l</mi><mi>e</mi><mi>r</mi><mo>−</mo><mi>r</mi><mi>t</mi><mi mathvariant="normal">/</mi><mi>l</mi><mi>i</mi><mi>b</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>u</mi><mi>i</mi><mi>l</mi><mi>t</mi><mi>i</mi><mi>n</mi><mi>s</mi><mo>−</mo><mi>n</mi><mi>o</mi><mi>d</mi><mi>e</mi><mi>f</mi><mi>a</mi><mi>u</mi><mi>l</mi><mi>t</mi><mi>l</mi><mi>i</mi><mi>b</mi><mi>s</mi></mrow><annotation encoding="application/x-tex">LLVM_SRC/compiler-rt/lib/builtins -nodefaultlibs </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">LL</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.10903em;">M</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:-0.109em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.05764em;">S</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.07153em;">RC</span><span class="mord">/</span><span class="mord mathnormal">co</span><span class="mord mathnormal">m</span><span class="mord mathnormal">p</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">t</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">ib</span><span class="mord">/</span><span class="mord mathnormal">b</span><span class="mord mathnormal">u</span><span class="mord mathnormal">i</span><span class="mord mathnormal">lt</span><span class="mord mathnormal">in</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">n</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">a</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.01968em;">ltl</span><span class="mord mathnormal">ib</span><span class="mord mathnormal">s</span></span></span></span>LLVM_SRC/compiler-rt/test/builtins/Unit/udivmodti4_test.c /path/to/libclang_rt.builtins-riscv64.a -lc -lm -o udivmodti4_test.c.tmp && qemu-riscv64 -L $RISCV_SYSROOT udivmodti4_test.c.tmp
My question: is there something wrong with the above cmake options, how to solve the builtin tests build failure?
Thanks!