Clang Warning Flag Dumper + Diff Viewer script

clang-dump-warnings.sh

#!/bin/bash

# This script is used to dump the warnings from the clang compiler
# into a file, and let you view/dump the diff between the warnings.

# $ clang-dump-warnings.sh <enable-diffs> <compiler-flags>

# Example:
# $ clang-dump-warnings.sh true -Wall -Wextra -Werror -Wno-unused-parameter

# The script will output the warnings into a file called "warnings.txt"
# in the current directory.

function usage {
    echo "Usage: $0 <enable-diffs> <compiler-flags>"
    echo "Example: $0 true -Wall -Wextra -Wnon-gcc"
    exit 1
}

if [ $# -lt 2 ]; then
    usage
fi

ENABLE_DIFFS=$1
shift

if [ "$ENABLE_DIFFS" != "true" ] && [ "$ENABLE_DIFFS" != "false" ]; then
    usage
fi

if [ "$ENABLE_DIFFS" = "true" ]; then
    DIFF_FILE=diffs.txt
    rm -f $DIFF_FILE
    touch $DIFF_FILE
fi

rm -f warnings.txt

while [ $# -gt 0 ]; do
    FLAGS="$FLAGS $1"
    shift
done

echo "Flags: $FLAGS"

# Make a temporary file for use with "diagtool".
touch tmp.cxx

# Run the compiler with the flags.
tmp_flags=""
prev_flags=""
for flag in $FLAGS; do
    tmp_flags="$tmp_flags $flag"
    diagtool show-enabled $tmp_flags tmp.cxx > warnings.txt
    if [ "$ENABLE_DIFFS" = "true" ]; then
        if [ -f $DIFF_FILE ]; then
            echo "Diff between '$prev_flags' and '$tmp_flags':"
            diff --color -u prev_warnings.txt warnings.txt
        fi
        cp warnings.txt prev_warnings.txt
        prev_flags="$tmp_flags"
    fi
done

rm -f tmp.cxx
rm -f prev_warnings.txt