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Commit73275f0

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Make building with LTO work on macOS
When building with -flto, the backend binary must keep many otherwiseunused symbols to make them available to dynamically loaded modules /extensions. This has been done via -Wl,--export-dynamic on manyplatforms 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.usAuthor: Wolfgang Walther <walther@technowledgy.de>Discussion:https://www.postgresql.org/message-id/flat/427c7c25-e8e1-4fc5-a1fb-01ceff185e5b@technowledgy.de
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‎configure

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Original file line numberDiff line numberDiff line change
@@ -19079,6 +19079,9 @@ fi
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# For linkers that understand --export-dynamic, add that to the LDFLAGS_EX_BE
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# (backend specific ldflags). One some platforms this will always fail (e.g.,
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# windows), but on others it depends on the choice of linker (e.g., solaris).
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# macOS uses -export_dynamic instead. (On macOS, the option is only
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# needed when also using -flto, but we add it anyway since it's
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# harmless.)
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,--export-dynamic, for LDFLAGS_EX_BE" >&5
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$as_echo_n "checking whether $CC supports -Wl,--export-dynamic, for LDFLAGS_EX_BE... " >&6; }
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if ${pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic+:} false; then :
@@ -19117,6 +19120,46 @@ if test x"$pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic" = x"yes"; then
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LDFLAGS_EX_BE="${LDFLAGS_EX_BE} -Wl,--export-dynamic"
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fi
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if test x"$LDFLAGS_EX_BE" = x""; then
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,-export_dynamic, for LDFLAGS_EX_BE" >&5
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$as_echo_n "checking whether $CC supports -Wl,-export_dynamic, for LDFLAGS_EX_BE... " >&6; }
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if ${pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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pgac_save_LDFLAGS=$LDFLAGS
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LDFLAGS="$pgac_save_LDFLAGS -Wl,-export_dynamic"
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if test "$cross_compiling" = yes; then :
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pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic="assuming no"
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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extern void $link_test_func (); void (*fptr) () = $link_test_func;
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_run "$LINENO"; then :
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pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic=yes
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else
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pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic=no
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fi
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rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
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conftest.$ac_objext conftest.beam conftest.$ac_ext
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fi
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LDFLAGS="$pgac_save_LDFLAGS"
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic" >&5
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$as_echo "$pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic" >&6; }
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if test x"$pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl__export_dynamic" = x"yes"; then
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LDFLAGS_EX_BE="${LDFLAGS_EX_BE} -Wl,-export_dynamic"
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fi
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fi
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# Create compiler version string

‎configure.ac

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Original file line numberDiff line numberDiff line change
@@ -2398,7 +2398,13 @@ fi
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# For linkers that understand --export-dynamic, add that to the LDFLAGS_EX_BE
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# (backend specific ldflags). One some platforms this will always fail (e.g.,
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# windows), but on others it depends on the choice of linker (e.g., solaris).
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# macOS uses -export_dynamic instead. (On macOS, the option is only
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# needed when also using -flto, but we add it anyway since it's
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# harmless.)
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PGAC_PROG_CC_LD_VARFLAGS_OPT(LDFLAGS_EX_BE,[-Wl,--export-dynamic], $link_test_func)
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if test x"$LDFLAGS_EX_BE" = x""; then
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PGAC_PROG_CC_LD_VARFLAGS_OPT(LDFLAGS_EX_BE,[-Wl,-export_dynamic], $link_test_func)
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fi
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AC_SUBST(LDFLAGS_EX_BE)
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# Create compiler version string

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