#!/bin/bash
# Wrapper around the opensource clang meant to work around various path or library
# issues occurring when one tries to substitute Apple's version of clang with
# a different version.
# The wrapper tries to mitigate version discrepancies in clang's fatal warnings.

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

CLANG_COMPILER="${SCRIPT_DIR}/../../../facebook-clang-plugins/clang/bin/clang"

if [ "${0%++}" != "$0" ]; then XX="++"; else XX=""; fi

COMMAND=("${CLANG_COMPILER}${XX}")

# Remove command line options not supported by the opensource compiler or the plugins.
PREV=""
for X in "$@"
do
    if [ "$X" == "-fapplication-extension" ] \
        || [ "$X" == "-fembed-bitcode-marker" ] \
        || [[ "$X" =~ "-mwatchos-version-min" ]]; then
        continue
    elif [ "$X" == "-gmodules" ]; then
        # gmodules is an alias for "-g -fmodule-format=obj -dwarf-ext-refs"
        # but "-fmodule-format" is not available, so skip it for now.
        COMMAND+=("-g" "-dwarf-ext-refs")
    elif [ "$X" == "armv7k" ] && [ "$PREV" == "-arch" ]; then
        # replace armv7k arch with armv7
        COMMAND+=("armv7")
    else
        COMMAND+=("$X")
    fi
    PREV="$X"
done

# Never error on warnings. Clang is often more strict than Apple's version.
# These arguments are appended to override previous opposite settings.
# How it's done: surpress all the warnings, since there are no warnings,
# compiler can't elevate them to error level.
COMMAND+=("-Wno-everything")


# set _FORTIFY_SOURCE to 0 to prevent it from changing some function prototypes
# https://securityblog.redhat.com/2014/03/26/fortify-and-you/
# We always do it when building models so we should do same thing
# when building any source code
COMMAND+=("-D_FORTIFY_SOURCE=0")

"${COMMAND[@]}"