From 6739825aa6e432fdb668e842def12c5deb3e5bad Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 12 Oct 2022 13:19:35 +0200
Subject: build: move coroutine backend selection to meson
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To simplify the code, rename coroutine-win32.c to match the option
passed to configure.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure | 62 --------------------------------------------------------------
 1 file changed, 62 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 94e89f4..0b57f56 100755
--- a/configure
+++ b/configure
@@ -282,7 +282,6 @@ softmmu="yes"
 linux_user=""
 bsd_user=""
 pie=""
-coroutine=""
 plugins="$default_feature"
 ninja=""
 bindir="bin"
@@ -843,8 +842,6 @@ for opt do
   ;;
   --enable-fdt=*) fdt="$optarg"
   ;;
-  --with-coroutine=*) coroutine="$optarg"
-  ;;
   --with-git=*) git="$optarg"
   ;;
   --with-git-submodules=*)
@@ -1003,8 +1000,6 @@ Advanced options (experts only):
   --disable-werror         disable compilation abort on warning
   --disable-stack-protector disable compiler-provided stack protection
   --cpu=CPU                Build for host CPU [$cpu]
-  --with-coroutine=BACKEND coroutine backend. Supported options:
-                           ucontext, sigaltstack, windows
   --enable-plugins
                            enable plugins via shared library loading
   --disable-containers     don't use containers for cross-building
@@ -1459,61 +1454,6 @@ case "$fdt" in
     ;;
 esac
 
-##########################################
-# check and set a backend for coroutine
-
-# We prefer ucontext, but it's not always possible. The fallback
-# is sigcontext. On Windows the only valid backend is the Windows
-# specific one.
-
-ucontext_works=no
-if test "$darwin" != "yes"; then
-  cat > $TMPC << EOF
-#include <ucontext.h>
-#ifdef __stub_makecontext
-#error Ignoring glibc stub makecontext which will always fail
-#endif
-int main(void) { makecontext(0, 0, 0); return 0; }
-EOF
-  if compile_prog "" "" ; then
-    ucontext_works=yes
-  fi
-fi
-
-if test "$coroutine" = ""; then
-  if test "$mingw32" = "yes"; then
-    coroutine=win32
-  elif test "$ucontext_works" = "yes"; then
-    coroutine=ucontext
-  else
-    coroutine=sigaltstack
-  fi
-else
-  case $coroutine in
-  windows)
-    if test "$mingw32" != "yes"; then
-      error_exit "'windows' coroutine backend only valid for Windows"
-    fi
-    # Unfortunately the user visible backend name doesn't match the
-    # coroutine-*.c filename for this case, so we have to adjust it here.
-    coroutine=win32
-    ;;
-  ucontext)
-    if test "$ucontext_works" != "yes"; then
-      error_exit "'ucontext' backend requested but makecontext not available"
-    fi
-    ;;
-  sigaltstack)
-    if test "$mingw32" = "yes"; then
-      error_exit "only the 'windows' coroutine backend is valid for Windows"
-    fi
-    ;;
-  *)
-    error_exit "unknown coroutine backend $coroutine"
-    ;;
-  esac
-fi
-
 ########################################
 # check if ccache is interfering with
 # semantic analysis of macros
@@ -2089,8 +2029,6 @@ if [ "$bsd" = "yes" ] ; then
   echo "CONFIG_BSD=y" >> $config_host_mak
 fi
 
-echo "CONFIG_COROUTINE_BACKEND=$coroutine" >> $config_host_mak
-
 if test "$plugins" = "yes" ; then
     echo "CONFIG_PLUGIN=y" >> $config_host_mak
 fi
-- 
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