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build: require glibc 2.18+ for release builds

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From what I can see the only platform this drops support for is CentOS
7. CentOS 7 reached the end of it's "full update" support at the end of
2020. It does receive maintenance updates until 2024, however I don't
think supporting glibc 2.17 until 2024 is realistic. Note that anyone
wanting to self-compile and target a glibc 2.17 runtime could build with
--disable-threadlocal.

glibc 2.18 was released in August 2013.
https://sourceware.org/legacy-ml/libc-alpha/2013-08/msg00160.html
This commit is contained in:
fanquake
2021-11-10 16:23:07 +08:00
parent 41e6909c07
commit dbfca4a815
5 changed files with 19 additions and 29 deletions
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3
configure.ac
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@ -1044,9 +1044,6 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([
[AC_MSG_RESULT([no])]
)
dnl thread_local is currently disabled when building with glibc back compat.
dnl Our minimum supported glibc is 2.17, however support for thread_local
dnl did not arrive in glibc until 2.18.
if test "x$use_thread_local" = xyes || test "x$use_thread_local" = xauto; then
TEMP_LDFLAGS="$LDFLAGS"
LDFLAGS="$TEMP_LDFLAGS $PTHREAD_CFLAGS"