From 640aabc8ae65f471daf67fdc41fed00d6d795a65 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 15 Jun 2022 11:42:01 +0200
Subject: [PATCH] configure, pc-bios/optionrom: pass cross CFLAGS correctly

The optionrom build is disregarding the flags passed to the configure
script via --cross-cflags-i386.  Pass it down and add it to the Makefile.

This will make it possible to get the -m32 flag from $target_cflags to
force a 32-bit build on 64-bit hosts, instead of supplying manually the
arcane -Wa,-32 and linker emulation options.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure                  | 32 ++++++++++++++++++--------------
 pc-bios/optionrom/Makefile |  2 +-
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/configure b/configure
index 76728b31f7..3d00b361d7 100755
--- a/configure
+++ b/configure
@@ -2057,19 +2057,22 @@ probe_target_compiler() {
   compute_target_variable $1 target_objcopy objcopy
   compute_target_variable $1 target_ranlib ranlib
   compute_target_variable $1 target_strip strip
-  if test "$1" = $cpu; then
-    : ${target_cc:=$cc}
-    : ${target_ccas:=$ccas}
-    : ${target_as:=$as}
-    : ${target_ld:=$ld}
-    : ${target_ar:=$ar}
-    : ${target_as:=$as}
-    : ${target_ld:=$ld}
-    : ${target_nm:=$nm}
-    : ${target_objcopy:=$objcopy}
-    : ${target_ranlib:=$ranlib}
-    : ${target_strip:=$strip}
-  fi
+  case "$1:$cpu" in
+    i386:x86_64 | \
+    "$cpu:$cpu")
+      : ${target_cc:=$cc}
+      : ${target_ccas:=$ccas}
+      : ${target_as:=$as}
+      : ${target_ld:=$ld}
+      : ${target_ar:=$ar}
+      : ${target_as:=$as}
+      : ${target_ld:=$ld}
+      : ${target_nm:=$nm}
+      : ${target_objcopy:=$objcopy}
+      : ${target_ranlib:=$ranlib}
+      : ${target_strip:=$strip}
+      ;;
+  esac
   if test -n "$target_cc"; then
     case $1 in
       i386|x86_64)
@@ -2238,7 +2241,7 @@ done
 
 # Mac OS X ships with a broken assembler
 roms=
-probe_target_compilers i386 x86_64
+probe_target_compiler i386
 if test -n "$target_cc" &&
         test "$targetos" != "darwin" && test "$targetos" != "sunos" && \
         test "$targetos" != "haiku" && test "$softmmu" = yes ; then
@@ -2257,6 +2260,7 @@ if test -n "$target_cc" &&
         echo "# Automatically generated by configure - do not modify" > $config_mak
         echo "TOPSRC_DIR=$source_path" >> $config_mak
         echo "LD_I386_EMULATION=$ld_i386_emulation" >> $config_mak
+        echo "EXTRA_CFLAGS=$target_cflags" >> $config_mak
         write_target_makefile >> $config_mak
     fi
 fi
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index ea89ce9d59..e90ca2e1c6 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -O2 -g
 quiet-command = $(if $(V),$1,$(if $(2),@printf "  %-7s %s\n" $2 $3 && $1, @$1))
 cc-option = $(if $(shell $(CC) $1 -c -o /dev/null -xc /dev/null >/dev/null 2>&1 && echo OK), $1, $2)
 
-override CFLAGS += -march=i486 -Wall -m16
+override CFLAGS += -march=i486 -Wall $(EXTRA_CFLAGS) -m16
 
 # If -fcf-protection is enabled in flags or compiler defaults that will
 # conflict with -march=i486