check-headers.sh

check-headers.sh

#!/bin/bash
#
# Checks that every header can be compiled independently.
#
# Compiles each header with g++ and clang++, then links them all together
# to confirm the one-definition-rule is not violated, i.e., all the
# `inline`-s are set and the library really is header-only.

set -u -e

CPPFLAGS="-std=c++11 -g -Wall -W"
LDFLAGS="-pthread"

TMPDIR=.tmp

rm -rf $TMPDIR/headers
mkdir -p $TMPDIR/headers

echo -e -n "\033[1mCompiling\033[0m:\033[36m"
for i in *.h ; do
  echo -n " $i"
  ln -sf $PWD/$i $PWD/$TMPDIR/headers/$i.g++.cc
  ln -sf $PWD/$i $PWD/$TMPDIR/headers/$i.clang++.cc
  g++ -I . ${CPPFLAGS} -c $PWD/$TMPDIR/headers/$i.g++.cc -o $PWD/$TMPDIR/headers/$i.g++.o ${LDFLAGS}
  clang++ -I . ${CPPFLAGS} -c $PWD/$TMPDIR/headers/$i.clang++.cc -o $PWD/$TMPDIR/headers/$i.clang++.o ${LDFLAGS}
done
echo

echo -e -n "\033[0m\033[1mLinking\033[0m:\033[1m\033[32m "
echo -e '#include <cstdio>\nint main() { printf("OK\\n"); }\n' >$TMPDIR/headers/main.cc
g++ -c $CPPFLAGS -o $TMPDIR/headers/main.o $TMPDIR/headers/main.cc $LDFLAGS
gcc -o $TMPDIR/headers/main $TMPDIR/headers/*.o $LDFLAGS
$TMPDIR/headers/main

echo -e -n "\033[0m"