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# Use a git submodule to download and build libtfm with the options we want.
# Maximum size of a bignum. See tfm.pdf section 1.3.6 ("Precision
# configuration") for details on how FP_MAX_SIZE works.
BITS := 8192
REPO := tomsfastmath
HDR := ${REPO}/src/headers/tfm.h
LIB := ${REPO}/libtfm.a
FLAGS := CFLAGS='-fPIC -Wall -W -Wshadow -Isrc/headers -g3 -DFP_MAX_SIZE="(${BITS}*2+(8*DIGIT_BIT))"'
TARGETS := $(notdir ${HDR} ${LIB})
SHA256SUM := $(firstword $(wildcard /usr/local/bin/sha256sum /usr/local/bin/gsha256sum /usr/bin/sha256sum))
all: ${TARGETS}
clean:
rm -f ${TARGETS} $(notdir ${HDR}.tmp)
cd ${REPO}; git clean -dxf
distclean: clean
git submodule deinit ${REPO}
rm -f TAGS
${HDR}:
git submodule update --init
${LIB}: ${HDR}
ifeq "" "${SHA256SUM}"
@echo "Couldn't find sha256sum, not verifying distribution checksums"
else
${SHA256SUM} --check Checksums
endif
cd ${REPO}; git clean -dxf
cd ${REPO}; ${MAKE} ${FLAGS}
$(notdir ${HDR}): ${HDR}
echo >$@.tmp '/* Configure size of largest bignum we want to handle -- see notes in tfm.pdf */'
echo >>$@.tmp '#define FP_MAX_SIZE (${BITS}*2+(8*DIGIT_BIT))'
echo >>$@.tmp ''
cat >>$@.tmp $^
mv -f $@.tmp $@
$(notdir ${LIB}): ${LIB}
ln -f $^ $@
tags: TAGS
TAGS: ${HDR}
find ${REPO} -type f -name '*.[ch]' -print | etags -
ifneq "" "${SHA256SUM}"
regenerate-checksums: ${HDR}
cd ${REPO}; git clean -dxf
find ${REPO} -name .git -prune -o -type f -print | sort | xargs ${SHA256SUM} >Checksums
endif
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