[clang] [llvm] [RISCV] Implement the implications of C extension (PR #132259)

Sat Mar 22 00:05:09 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu` running on `sie-linux-worker3` while building `clang,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/14962

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'lld :: ELF/riscv-attributes.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 3: rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/riscv-attributes.s.tmp && split-file /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/riscv-attributes.s /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/riscv-attributes.s.tmp && cd /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/riscv-attributes.s.tmp
+ rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/riscv-attributes.s.tmp
+ split-file /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/riscv-attributes.s /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/riscv-attributes.s.tmp
+ cd /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/riscv-attributes.s.tmp
RUN: at line 4: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-mc -filetype=obj -triple=riscv64 a.s -o a.o
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-mc -filetype=obj -triple=riscv64 a.s -o a.o
RUN: at line 5: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/ld.lld -e 0 a.o -o out 2>&1 | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/count 0
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/ld.lld -e 0 a.o -o out
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/count 0
RUN: at line 6: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-readelf -S -l --arch-specific out | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/riscv-attributes.s --check-prefixes=HDR,CHECK
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-readelf -S -l --arch-specific out
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/riscv-attributes.s --check-prefixes=HDR,CHECK
[1m/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/riscv-attributes.s:107:8: [0m[0;1;31merror: [0m[1mHDR: expected string not found in input
[0m# HDR: .riscv.attributes RISCV_ATTRIBUTES 0000000000000000 000158 00005a 00 0 0 1{{$}}
[0;1;32m       ^
[0m[1m<stdin>:4:50: [0m[0;1;30mnote: [0m[1mscanning from here
[0m [Nr] Name Type Address Off Size ES Flg Lk Inf Al
[0;1;32m                                                 ^
[0m[1m<stdin>:7:7: [0m[0;1;30mnote: [0m[1mpossible intended match here
[0m [ 2] .riscv.attributes RISCV_ATTRIBUTES 0000000000000000 000158 000068 00 0 0 1
[0;1;32m      ^
[0m
Input file: <stdin>
Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/riscv-attributes.s

-dump-input=help explains the following input dump.

Input was:
<<<<<<
[1m[0m[0;1;30m             1: [0m[1m[0;1;46mThere are 7 section headers, starting at offset 0x238: [0m
[0;1;30m             2: [0m[1m[0;1;46m [0m
[0;1;30m             3: [0m[1m[0;1;46mSection Headers: [0m
[0;1;30m             4: [0m[1m[0;1;46m [Nr] [0mName Type Address Off Size ES Flg Lk Inf Al[0;1;46m [0m
[0;1;32mcheck:106             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;31mcheck:107'0                                                      X error: no match found
[0m[0;1;30m             5: [0m[1m[0;1;46m [ 0] NULL 0000000000000000 000000 000000 00 0 0 0 [0m
[0;1;31mcheck:107'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m             6: [0m[1m[0;1;46m [ 1] .text PROGBITS 0000000000011158 000158 000000 00 AX 0 0 4 [0m
[0;1;31mcheck:107'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m             7: [0m[1m[0;1;46m [ 2] .riscv.attributes RISCV_ATTRIBUTES 0000000000000000 000158 000068 00 0 0 1 [0m
[0;1;31mcheck:107'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;35mcheck:107'1           ?                                                                           possible intended match
[0m[0;1;30m             8: [0m[1m[0;1;46m [ 3] .comment PROGBITS 0000000000000000 0001c0 000008 01 MS 0 0 1 [0m
[0;1;31mcheck:107'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m             9: [0m[1m[0;1;46m [ 4] .symtab SYMTAB 0000000000000000 0001c8 000030 18 6 2 8 [0m
...

```

</details>

https://github.com/llvm/llvm-project/pull/132259