I failed to build mozjs on Lubuntu 18.04.

[veer66]

When I ran cargo build I got this error message:

/home/vee/Develop/free/mozjs/target/debug/build/mozjs_sys-ec031bee7e5f078f/out/dist/include/mozilla/Compiler.h:49:12: fatal error: 'cstddef' file not found

So I try to set these environment variables as follows:

export HOST_CC=clang
export HOST_CXX=clang++
export LIBCLANG_PATH=/usr/lib/clang/6.0/lib

Then I got this error message instead:

Internal error occurred: Command "clang++" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=x86_64-unknown-linux-gnu" "-I" "/home/vee/Develop/free/mozjs/target/debug/build/mozjs_sys-ec031bee7e5f078f/out/dist/include" "-I" "/home/vee/Develop/free/mozjs/target/debug/build/mozjs_sys-ec031bee7e5f078f/out/js/src" "-Wall" "-Wextra" "-include" "/home/vee/Develop/free/mozjs/target/debug/build/mozjs_sys-ec031bee7e5f078f/out/js/src/js-confdefs.h" "-o" "/home/vee/Develop/free/mozjs/target/debug/build/mozjs_sys-ec031bee7e5f078f/out/src/jsglue.o" "-c" "src/jsglue.cpp" with args "clang++" did not execute successfully (status code exit code: 1).

[veer66]

libstdc++-7-dev wasn't enough. So I still whatever version available and it works.

$ dpkg -l | grep libstd
ii  libstdc++-5-dev:amd64                         5.5.0-12ubuntu1                            amd64        GNU Standard C++ Library v3 (development files)
ii  libstdc++-6-dev:amd64                         6.4.0-17ubuntu1                            amd64        GNU Standard C++ Library v3 (development files)
ii  libstdc++-7-dev:amd64                         7.3.0-16ubuntu3                            amd64        GNU Standard C++ Library v3 (development files)
ii  libstdc++-8-dev:amd64                         8-20180414-1ubuntu2                        amd64        GNU Standard C++ Library v3 (development files)
ii  libstdc++6:amd64                              8-20180414-1ubuntu2                        amd64        GNU Standard C++ Library v3

I don't know which one made it works.