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# Download and build libtfm from source with the options we want.
# Commit against which we've been testing. Perhaps we should be using
# a git subrepository instead of this hack?
URL := https://github.com/libtom/tomsfastmath.git
COMMIT := e0fe602802e376a971a84ba300ad0aab17165600
# 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 := $(notdir $(basename ${URL}))
HDR := ${REPO}/src/headers/tfm.h
LIB := ${REPO}/libtfm.a
FLAGS := CFLAGS='-fPIC -Wall -W -Wshadow -Isrc/headers -g3 -DFP_MAX_SIZE="(${BITS}+(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
rm -rf ${REPO} TAGS
${HDR}:
git clone --quiet --no-checkout ${URL}
cd ${REPO}; git checkout --quiet ${COMMIT}
${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}+(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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