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fix: [install.sh] if glibc >= 2.18, use the dynamically linked binary

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`install.sh` previously uses the statically linked `unknown-linux-musl` build
for every Linux installation. If the host's `libc` is a recent enough
GNU libc, however,  it should use this rather than the statically linked build.

Includes documentation from the PR conversation about how to recompute the
minimum version as needed.

Signed-off-by: Michel Alexandre Salim <michel@michel-slm.name>
This commit is contained in:
Michel Alexandre Salim 2021-04-19 14:12:51 -07:00
parent 0f3a58352f
commit dd9e7323d6
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GPG Key ID: 8B229D2F7CCC04F2
1 changed files with 28 additions and 2 deletions
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30
install/install.sh
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@ -193,8 +193,34 @@ detect_platform() {
cygwin_nt*) platform="pc-windows-msvc";;
# mingw is Git-Bash
mingw*) platform="pc-windows-msvc" ;;
# use the statically compiled musl bins on linux to avoid linking issues.
linux) platform="unknown-linux-musl" ;;
linux)
# default to the statically compiled musl bins on linux
# to avoid linking issues.
platform="unknown-linux-musl"
# musl's ldd from Alpine prints to stderr
ldd_verstr="$(ldd --version 2>&1 | head -n1)"
# glibc version string is inconsistent across distributions
# instead check if the string does not contain musl (case insensitive)
if echo "${ldd_verstr}" | grep -iv musl >/dev/null; then
glibc_version=$(echo "${ldd_verstr}" | awk 'NR==1 { print $NF }')
# on installations with a new enough glibc, use the dynamically compiled binary
#
# use this to see potential max versions
# strings $(which starship) | grep -i glibc
#
# then use https://gist.github.com/fasterthanlime/17e002a8f5e0f189861c with
# `MAX_VER` set to the version from earlier e.g. GLIBC_2.33 => 2.33
glibc_maj_ver=$(echo "${glibc_version}" | cut -d. -f1)
glibc_min_ver=$(echo "${glibc_version}" | cut -d. -f2)
min_maj_ver=2
min_min_ver=18
if [ "${glibc_maj_ver}" -gt "${min_maj_ver}" ] \
|| { [ "${glibc_maj_ver}" -eq "${min_maj_ver}" ] \
&& [ "${glibc_min_ver}" -ge "${min_min_ver}" ]; }; then
platform="unknown-linux-gnu"
fi
fi
;;
darwin) platform="apple-darwin" ;;
freebsd) platform="unknown-freebsd" ;;
esac