[llvm-bugs] [Bug 49036] New: clang debug info generation for WebAssembly does not work with -fno-integrated-as

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49036

            Bug ID: 49036
           Summary: clang debug info generation for WebAssembly does not
                    work with -fno-integrated-as
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: WebAssembly
          Assignee: unassignedbugs at nondot.org
          Reporter: nickysn at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24480
  --> https://bugs.llvm.org/attachment.cgi?id=24480&action=edit
Example program that can be use to reproduce this bug

Using LLVM built from the git main branch, commit
ba87f99168c93461b28a4aa2d05e238ff774d57a.

clang --target=wasm32 -v -g -fno-integrated-as debug.c -o debug.wasm

gives the following errors:

clang version 13.0.0 (https://github.com/llvm/llvm-project.git
ba87f99168c93461b28a4aa2d05e238ff774d57a)
Target: wasm32
Thread model: posix
InstalledDir: /home/nickysn/tralala/llvm/llvm-project/build/bin
 "/home/nickysn/tralala/llvm/llvm-project/build/bin/clang-13" -cc1 -triple
wasm32 -S -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name debug.c -mrelocation-model static -mframe-pointer=none
-fno-rounding-math -no-integrated-as -mconstructor-aliases -target-cpu generic
-fvisibility hidden -debug-info-kind=limited -dwarf-version=4
-debugger-tuning=gdb -v -resource-dir
/home/nickysn/tralala/llvm/llvm-project/build/lib/clang/13.0.0
-internal-isystem
/home/nickysn/tralala/llvm/llvm-project/build/lib/clang/13.0.0/include
-internal-isystem /include -fno-dwarf-directory-asm -fdebug-compilation-dir
/home/nickysn/tralala/fpc-wasm/wasi/ctest/debug -ferror-limit 19
-fgnuc-version=4.2.1 -fcolor-diagnostics -o /tmp/debug-b15aaa.s -x c debug.c
clang -cc1 version 13.0.0 based upon LLVM 13.0.0git default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/nickysn/tralala/llvm/llvm-project/build/lib/clang/13.0.0/include
End of search list.
 "/home/nickysn/tralala/llvm/llvm-project/build/bin/clang-13" -cc1as -triple
wasm32 -filetype obj -main-file-name debug.c -target-cpu generic
-dwarf-version=4 -mrelocation-model static -mrelax-all --mrelax-relocations -o
/tmp/debug-ae345d.o /tmp/debug-b15aaa.s
/tmp/debug-b15aaa.s:15:14: error: End of block construct with no start:
end_function
        end_function
                    ^
/tmp/debug-b15aaa.s:31:14: error: End of block construct with no start:
end_function
        end_function
                    ^
/tmp/debug-b15aaa.s:44:11: error: .local directive should follow the start of a
functioni32
        .local          i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32,
i32
                        ^
/tmp/debug-b15aaa.s:104:14: error: End of block construct with no start:
end_function
        end_function
                    ^
/tmp/debug-b15aaa.s:116:11: error: .local directive should follow the start of
a functioni32
        .local          i32
                        ^
/tmp/debug-b15aaa.s:122:14: error: End of block construct with no start:
end_function
        end_function
                    ^

Compilation with "-g", but without "-fno-integrated-as" works.
Compilation without "-g", but with "-fno-integrated-as" also works.
Compilation for other targets (linux x86_64) with both "-g" and
"-fno-integrated-as" also works.

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