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40 lines
1.6 KiB
Diff
40 lines
1.6 KiB
Diff
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From d99a6180cdca6274f1a8b868c38a89883daf6e23 Mon Sep 17 00:00:00 2001
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From: Martin Storsjo <martin@martin.st>
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Date: Wed, 21 Jun 2017 11:42:40 +0300
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Subject: [PATCH] configure: Avoid clobbering x18 on arm64 within wine
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On aarch64/arm64 on linux, the compiler is free to use x18 for normal
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code generation (while the register is reserved on iOS/darwin, and
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on windows).
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If targeting arm64, check for the flags that allows this register to
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be left untouched (the flag is supported both by gcc and clang).
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Similar issues can still pop up as soon as system library functions
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that happen to touch x18 are called, unless the system libraries have
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been built with the same flag.
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Signed-off-by: Martin Storsjo <martin@martin.st>
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---
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configure.ac | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/configure.ac b/configure.ac
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index d1502bacf7..6cf838ef09 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -212,6 +212,10 @@ case $host in
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdarg.h>]], [[void func(__builtin_ms_va_list *args);]])],
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[wine_cv_builtin_ms_va_list=yes],[wine_cv_builtin_ms_va_list=no])])
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test $wine_cv_builtin_ms_va_list != no || AC_MSG_ERROR([You need clang >= 5.0 to build Wine for arm64.])
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+ # Avoid clobbering the x18 register which is reserved in windows.
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+ # This isn't complete/enough unless all of the system libraries have
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+ # been built with the same flag though.
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+ WINE_TRY_CFLAGS([-ffixed-x18], [CFLAGS="$CFLAGS -ffixed-x18"])
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;;
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i[[3456789]]86*)
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enable_win16=${enable_win16:-yes}
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--
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2.17.1
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