configure

#!/bin/bash -f

echo -n 'Checking for Clang... '
if (which clang >/dev/null 2>&1); then
	compiler=clang
	linker=clang
	echo 'yes'
else
	compiler=gcc
	linker=gcc
	echo 'no'
fi

echo -n 'Checking for strlcpy/strlcat without extra libraries... '
cat >strlcpy_test_src.c <<SRC
#include "string.h"
int main(void) {
	char buf[256] = "";
	strlcpy(buf, "Test string", 256);
	return 0;
}
SRC

base_ldflags='-pthread -lm'
has_strlcpy=
if (${compiler} -x c -o tmp.exe strlcpy_test_src.c >/dev/null 2>&1); then
	echo 'yes'
	has_strlcpy=yes
	additional_ldflags=''
else
	echo 'no'
	echo -n 'Checking for strlcpy/strlcat with -lbsd... '
	if (${compiler} -x c -lbsd -o tmp.exe strlcpy_test_src.c >/dev/null 2>&1); then
		echo 'yes'
		has_strlcpy=yes
		additional_ldflags='-lbsd'
	else
		echo 'no'
	fi
fi
rm -f strlcpy_test_src.c tmp.exe >/dev/null 2>&1 || true
if [[ -z "$has_strlcpy" ]]; then
	echo 'strlcpy/strlcat are missing. You may need to install libbsd-dev.' >&2
	exit 1
fi

echo -n 'Checking platform name... '
os_name="$(uname)"
prefix_name="prefix_${os_name}.h"
prefix_path="dd-parallel-posix/$prefix_name"
if [[ -f "$prefix_path" ]]; then
	echo $os_name
else
	echo "$os_name (never heard of it; can't build for it)"
	exit 1
fi

echo >Makefile.defs
echo "compiler=${compiler}" >>Makefile.defs
echo "linker=${linker}" >>Makefile.defs
echo "os_name=${os_name}" >>Makefile.defs
echo "prefix_name=${prefix_name}" >>Makefile.defs
echo "cflags=-g -include ${prefix_path}" >>Makefile.defs
echo "ldflags=${base_ldflags} ${additional_ldflags}" >>Makefile.defs