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1093-Undo-perform-degradation-on-macOS.patch
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File 1093-Undo-perform-degradation-on-macOS.patch of Package erlang
From 459580742734f117d6bc3e3965349b4d45562aa3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org> Date: Thu, 24 Sep 2020 08:15:13 +0200 Subject: [PATCH] Undo perform degradation on macOS Apple Clang 12 included in Xcode 12 reports an error when a function without a declaration is used. That change causes the configure test for jump table support to wrongly assume that jump table support is missing, and therefore a `switch` would be used, degrading the performance of BEAM. --- erts/aclocal.m4 | 2 ++ 1 file changed, 2 insertions(+) diff --git a/erts/aclocal.m4 b/erts/aclocal.m4 index 8926ad728e..d237f7ae08 100644 --- a/erts/aclocal.m4 +++ b/erts/aclocal.m4 @@ -243,6 +243,7 @@ AC_TRY_COMPILE([],[ #endif __label__ lbl1; __label__ lbl2; + extern int magic(void); int x = magic(); static void *jtab[2]; @@ -288,6 +289,7 @@ if test "$ac_cv_prog_emu_cc" != no; then #endif __label__ lbl1; __label__ lbl2; + extern int magic(void); int x = magic(); static void *jtab[2]; -- 2.26.2
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