configure

#!/bin/sh -e

# PractRand configure script
#
# Accepts no arguments and only loads some defaults from environment
# variables. Example usage:
#   $ CXX=g++ ./configure
#   $ make -kj$(nproc)
# Or:
#   $ CXX=g++ \
#     CXXFLAGS='-ggdb3 -Og -fsanitize=address -fsanitize=undefined' \
#     LDFLAGS='-fsanitize=address -fsanitize=undefined' \
#     ./configure
#   $ make -kj$(nproc)

CXX=${CXX:-c++}
CXXFLAGS=${CXXFLAGS:--std=c++14 -O3}
LDFLAGS=${LDFLAGS:-}
LDLIBS=${LDLIBS:-}

cat >Makefile <<EOF
.POSIX:
.SUFFIXES:
CXX      = $CXX
CXXFLAGS = $CXXFLAGS
LDFLAGS  = $LDFLAGS
LDLIBS   = $LDLIBS

all: RNG_test

clean:
	rm -f RNG_test \$(obj)

.SUFFIXES: .cpp .o
.cpp.o:
	\$(CXX) -c -Iinclude -pthread \$(CXXFLAGS) -o \$@ \$<

EOF

for cpp in src/*.cpp src/RNGs/*.cpp src/RNGs/other/*.cpp tools/RNG_test.cpp; do
    o="${cpp%*.cpp}".o
    $CXX -Iinclude -pthread -MM -MT$o $cpp >>Makefile
    obj="$(printf '%s \\\n %s' "$obj" $o)"
    files="$files $o"
done

cat >>Makefile <<EOF
obj =$obj

RNG_test: \$(obj) Makefile
	\$(CXX) -pthread \$(LDFLAGS) -o \$@ \$(obj) \$(LDLIBS)

EOF

for file in $files; do
    printf '%s: Makefile\n' $file >>Makefile
done