configure: fix parameter expansion of --cross-cc-cflags options

Without this fix, any use of --cross-cc-cflags-* causes a message like:
$ ../configure --cross-cc-ppc64le=clang --cross-cc-cflags-ppc64le="-target powerpc64le-unknown-linux-gnu -sysroot ..."
../configure: 1: eval: cross_cc_cflags_--cross-cc-cflags-ppc64le=-target: not found
../configure: 3816: export: cross_cc_cflags_--cross-cc-cflags-ppc64le: bad variable name

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20220120173142.2755077-1-matheus.ferst@eldorado.org.br>
[Fix other occurrences too, noted by Philippe Mathieu-Daudé. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/configure b/configure
index e1a31fb332..e6cfc0e4be 100755
--- a/configure
+++ b/configure
@@ -402,7 +402,7 @@ for opt do
   ;;
   --cross-cc-*[!a-zA-Z0-9_-]*=*) error_exit "Passed bad --cross-cc-FOO option"
   ;;
-  --cross-cc-cflags-*) cc_arch=${opt#--cross-cc-flags-}; cc_arch=${cc_arch%%=*}
+  --cross-cc-cflags-*) cc_arch=${opt#--cross-cc-cflags-}; cc_arch=${cc_arch%%=*}
                       eval "cross_cc_cflags_${cc_arch}=\$optarg"
                       cross_cc_vars="$cross_cc_vars cross_cc_cflags_${cc_arch}"
   ;;
@@ -1328,7 +1328,7 @@ Advanced options (experts only):
   --extra-cxxflags=CXXFLAGS append extra C++ compiler flags CXXFLAGS
   --extra-ldflags=LDFLAGS  append extra linker flags LDFLAGS
   --cross-cc-ARCH=CC       use compiler when building ARCH guest test cases
-  --cross-cc-flags-ARCH=   use compiler flags when building ARCH guest tests
+  --cross-cc-cflags-ARCH=  use compiler flags when building ARCH guest tests
   --make=MAKE              use specified make [$make]
   --python=PYTHON          use specified python [$python]
   --sphinx-build=SPHINX    use specified sphinx-build [$sphinx_build]