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Make building with LTO work on macOS

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When building with -flto, the backend binary must keep many otherwise
unused symbols to make them available to dynamically loaded modules /
extensions.  This has been done via -Wl,--export-dynamic on many
platforms for years.  This flag is not supported by the macOS linker,
though.  Here it's called -Wl,-export_dynamic instead.

Thus, make configure pick up on this variant of the flag as well.
Meson has the logic upstream as of version 1.5.0.

Without this fix, building with -flto fails with errors similar to [1]
and [2].

[1]: https://postgr.es/m/1581936537572-0.post%40n3.nabble.com
[2]: https://postgr.es/m/21800.1499270547%40sss.pgh.pa.us

Author: Wolfgang Walther <walther@technowledgy.de>
Discussion: https://www.postgresql.org/message-id/flat/427c7c25-e8e1-4fc5-a1fb-01ceff185e5b@technowledgy.de
This commit is contained in:
Peter Eisentraut
2024-07-31 06:22:02 +02:00
parent 0dcea330ba
commit 73275f093f
2 changed files with 49 additions and 0 deletions
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6
configure.ac
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@ -2398,7 +2398,13 @@ fi
# For linkers that understand --export-dynamic, add that to the LDFLAGS_EX_BE
# (backend specific ldflags). One some platforms this will always fail (e.g.,
# windows), but on others it depends on the choice of linker (e.g., solaris).
# macOS uses -export_dynamic instead. (On macOS, the option is only
# needed when also using -flto, but we add it anyway since it's
# harmless.)
PGAC_PROG_CC_LD_VARFLAGS_OPT(LDFLAGS_EX_BE, [-Wl,--export-dynamic], $link_test_func)
if test x"$LDFLAGS_EX_BE" = x""; then
PGAC_PROG_CC_LD_VARFLAGS_OPT(LDFLAGS_EX_BE, [-Wl,-export_dynamic], $link_test_func)
fi
AC_SUBST(LDFLAGS_EX_BE)
# Create compiler version string