clang: error: no such file or directory: 'crs'

[ctaggart]

I'm guessing that I'm missing some build dependency. I've installed clang 8.0 and I've trying to build with

ctaggart@rustasia:~/wasi-sysroot$ make WASM_CC=/usr/bin/clang-8

But the build ends with:

clang: error: no such file or directory: 'crs'
clang: error: no such file or directory: '/home/ctaggart/wasi-sysroot/sysroot/lib/wasm32-wasi/libc.a'
Makefile:225: recipe for target '/home/ctaggart/wasi-sysroot/sysroot/lib/wasm32-wasi/libc.a' failed
make: *** [/home/ctaggart/wasi-sysroot/sysroot/lib/wasm32-wasi/libc.a] Error 1

I installed clang using instructions from http://apt.llvm.org/

sudo apt-get install clang-8 lldb-8 lld-8

Do I need something else?

[ctaggart]

Here is the full output from:

ctaggart@rustasia:~/wasi-sysroot$ make WASM_CC=/usr/bin/clang-8 &> build.txt

build.txt

[jedisct1]

Do you have the llvm-ar and llvm-nm commands on your system?

[jedisct1]

If not, I think you need the llvm package, too.

[ctaggart]

I've got llvm-ar-8 and llvm-nm-8. It looks like everything was installed already:

ctaggart@rustasia:~$ sudo apt-get install libllvm8 llvm-8 llvm-8-dev llvm-8-runtime
Reading package lists... Done
Building dependency tree
Reading state information... Done
libllvm8 is already the newest version (1:8.0.1~svn359952-1~exp1~20190504005826.64).
libllvm8 set to manually installed.
llvm-8 is already the newest version (1:8.0.1~svn359952-1~exp1~20190504005826.64).
llvm-8 set to manually installed.
llvm-8-dev is already the newest version (1:8.0.1~svn359952-1~exp1~20190504005826.64).
llvm-8-dev set to manually installed.
llvm-8-runtime is already the newest version (1:8.0.1~svn359952-1~exp1~20190504005826.64).
llvm-8-runtime set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
ctaggart@rustasia:~$ llvm-
llvm-ar-8              llvm-c-test-8          llvm-dlltool-8         llvm-link-8            llvm-nm-8              llvm-ranlib-8          llvm-stress-8
llvm-as-8              llvm-cvtres-8          llvm-dwarfdump-8       llvm-lto2-8            llvm-objcopy-8         llvm-rc-8              llvm-strings-8
llvm-bcanalyzer-8      llvm-cxxdump-8         llvm-dwp-8             llvm-lto-8             llvm-objdump-8         llvm-readelf-8         llvm-strip-8
llvm-cat-8             llvm-cxxfilt-8         llvm-elfabi-8          llvm-mc-8              llvm-opt-report-8      llvm-readobj-8         llvm-symbolizer-8
llvm-cfi-verify-8      llvm-cxxmap-8          llvm-exegesis-8        llvm-mca-8             llvm-pdbutil-8         llvm-rtdyld-8          llvm-tblgen-8
llvm-config-8          llvm-diff-8            llvm-extract-8         llvm-modextract-8      llvm-PerfectShuffle-8  llvm-size-8            llvm-undname-8
llvm-cov-8             llvm-dis-8             llvm-lib-8             llvm-mt-8              llvm-profdata-8        llvm-split-8           llvm-xray-8

[jedisct1]

The mandatory -8 suffix is the issue here.

In addition to WASM_CC, you need to define WASM_NM and WASM_AR.

[ctaggart]

Yes, that was it!

make WASM_CC=/usr/bin/clang-8 WASM_NM=/usr/bin/llvm-nm-8 WASM_AR=/usr/bin/llvm-ar-8

The build succeeded! The generated sysroot is in /home/ctaggart/wasi-sysroot/sysroot

[ctaggart]

Looks like I could/should have added /usr/lib/llvm-8/bin to my PATH to simplify things.

ctaggart@rustasia:~/libgit2/build$ ls /usr/lib/llvm-8/bin
bugpoint   ld.lld          lldb-server-8      llvm-ar          llvm-c-test   llvm-dlltool    llvm-link        llvm-nm              llvm-ranlib   llvm-stress      obj2yaml
clang      llc             lldb-server-8.0.1  llvm-as          llvm-cvtres   llvm-dwarfdump  llvm-lto         llvm-objcopy         llvm-rc       llvm-strings     opt
clang++    lld             lldb-test          llvm-bcanalyzer  llvm-cxxdump  llvm-dwp        llvm-lto2        llvm-objdump         llvm-readelf  llvm-strip       sanstats
clang-8    lldb            lldb-vscode        llvm-cat         llvm-cxxfilt  llvm-elfabi     llvm-mc          llvm-opt-report      llvm-readobj  llvm-symbolizer  verify-uselistorder
clang-cpp  lldb-argdumper  lld-link           llvm-cfi-verify  llvm-cxxmap   llvm-exegesis   llvm-mca         llvm-pdbutil         llvm-rtdyld   llvm-tblgen      wasm-ld
dsymutil   lldb-mi         lli                llvm-config      llvm-diff     llvm-extract    llvm-modextract  llvm-PerfectShuffle  llvm-size     llvm-undname     yaml2obj
ld64.lld   lldb-server     lli-child-target   llvm-cov         llvm-dis      llvm-lib        llvm-mt          llvm-profdata        llvm-split    llvm-xray        yaml-bench

[jedisct1]

Either work :)

But overriding the default system compiler can have unintended implications if you recompile system packages from source.