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https://github.com/cosinekitty/astronomy.git
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2c787eca8e
Instead of turning off all "expensive optimizations" in gcc, I found I can achieve consistent calculation results on 64-bit ARM processors by turning off just the "fp contract" optimization. This optimizer is actually supposed to produce *more* accurate results, but the effect is to produce results that differ across languages/processors. For the sake of the unit tests, I have decided it must be turned off in ctest and generate.
37 lines
1.2 KiB
Bash
Executable File
37 lines
1.2 KiB
Bash
Executable File
#!/bin/bash
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Fail()
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{
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echo "ERROR($0): $1"
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exit 1
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}
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[[ -z "${CC}" ]] && CC=gcc
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echo "$0: C compiler = ${CC}"
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if [[ "$1" == "debug" ]]; then
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BUILDOPT='-g -Og'
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elif [[ "$1" == "opt" ]]; then
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BUILDOPT="$2"
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echo "Using custom build options: ${BUILDOPT}"
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elif [[ -z "$1" ]]; then
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# On Arch Linux running gcc 9.3.0 on aarch64 (Rasbperry Pi 3),
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# started to get some numeric discrepancies in 'ctest check' output
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# until I turned off "fp contract" optimizations.
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# Some processors (including 64-bit ARM) have the ability to evaluate floating point
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# expressions like "a*b + c" with a single instruction, and to
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# do so without rounding the intermediate multiplication result.
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# Although this is *more* accurate, it produces results that are
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# different from other processors, which is counterproductive for
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# unit tests. Therefore, I turn it off here. Users of the C
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# version of Astronomy Engine can safely build other code with '-O3' by itself.
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BUILDOPT='-O3 -ffp-contract=off'
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else
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Fail "unrecognized command line option"
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fi
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${CC} ${BUILDOPT} -Wall -Werror -o ctest -I ../source/c/ ../source/c/astronomy.c ctest.c -lm || Fail "Error building ctest"
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echo "$0: Built 'ctest' program."
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exit 0
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