[PATCH v2 13/14] configure: don't try a "native" cross for linux-user

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As 32 bit x86 become rarer we are starting to run into problems with
search paths. Although we switched to a Debian container we still
favour the native CC on a Bookworm host. As a result we have a broken
cross compile setup which then fails to build with:

    BUILD   i386-linux-user guest-tests
  In file included from /usr/include/linux/stat.h:5,
                   from /usr/include/bits/statx.h:31,
                   from /usr/include/sys/stat.h:465,
                   from /home/alex/lsrc/qemu.git/tests/tcg/multiarch/linux/linux-test.c:28:
  /usr/include/linux/types.h:5:10: fatal error: asm/types.h: No such file or directory
      5 | #include <asm/types.h>
        |          ^~~~~~~~~~~~~
  compilation terminated.
  make[1]: *** [Makefile:119: linux-test] Error 1
  make: *** [/home/alex/lsrc/qemu.git/tests/Makefile.include:50: build-tcg-tests-i386-linux-user] Error 2

This is likely to affect more and more linux-user builds so wrap the
whole check in a test for softmmu targets (aka bare metal) which don't
worry about such header niceties. This allows us to keep using the
host compiler for softmmu tests and the roms.

Signed-off-by: Alex Bennée <alex.bennee@xxxxxxxxxx>

---
v2
  - split fix for tests/docker: replace fedora-i386 with debian-i686
    as still in my tree ;-)
  - didn't apply dpb rb due to change requested by bonzini
---
 configure | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/configure b/configure
index 9ea0bf5698..42fe4d0510 100755
--- a/configure
+++ b/configure
@@ -1391,16 +1391,19 @@ probe_target_compiler() {
   done
 
   try=cross
-  case "$target_arch:$cpu" in
-    aarch64_be:aarch64 | \
-    armeb:arm | \
-    i386:x86_64 | \
-    mips*:mips64 | \
-    ppc*:ppc64 | \
-    sparc:sparc64 | \
-    "$cpu:$cpu")
-      try='native cross' ;;
-  esac
+  # For softmmu/roms we might be able to use the host compiler
+  if [ "${1%softmmu}" != "$1" ]; then
+      case "$target_arch:$cpu" in
+        aarch64_be:aarch64 | \
+        armeb:arm | \
+        i386:x86_64 | \
+        mips*:mips64 | \
+        ppc*:ppc64 | \
+        sparc:sparc64 | \
+        "$cpu:$cpu")
+        try='native cross' ;;
+      esac
+  fi
   eval "target_cflags=\${cross_cc_cflags_$target_arch}"
   for thistry in $try; do
     case $thistry in
-- 
2.39.2
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