quoting issue in GCC's gcc/config.gcc ?

[Matthias Klose]

seen with bash-4.2.6 with gcc-4.5, configured on i686-linux-gnu with
--enable-targets=all --with-arch-32=i686, works with bash-4.1:

                        case X"${with_cpu}" in

Xgeneric|Xatom|Xcore2|Xnocona|Xx86-64|Xamdfam10|Xbarcelona|Xk8|Xopteron|Xathlon64|Xathlon-fx|Xathlon64-sse3|Xk8-sse3|Xopteron-sse3)
                                ;;
                        X)
                                if test x$with_cpu_64 = x; then
                                        with_cpu_64=generic
                                fi
                                ;;
                        *)
                                echo "Unsupported CPU used in
--with-cpu=$with_cpu, supported values:" 1>&2
                                echo "generic atom core2 nocona x86-64 amdfam10
barcelona k8 opteron athlon64 athlon-fx athlon64-sse3 k8-sse3 opteron-sse3" 1>&2
                                exit 1
                                ;;
                        esac
                else
                        tm_file="${tm_file} i386/linux.h"
                fi
                ;;

executing as:

++ case X"${with_cpu}" in
++ echo 'Unsupported CPU used in --with-cpu=, supported values:'
Unsupported CPU used in --with-cpu=, supported values:
++ echo 'generic atom core2 nocona x86-64 amdfam10 barcelona k8 opteron athlon64
athlon-fx athlon64-sse3 k8-sse3 opteron-sse3'
generic atom core2 nocona x86-64 amdfam10 barcelona k8 opteron athlon64
athlon-fx athlon64-sse3 k8-sse3 opteron-sse3
++ exit 1
+ exit_status=1

with_cpu is unset, and the second case statement should be reached.

replacing
                        case X"${with_cpu}" in
with
                        case X${with_cpu} in

lets the match suceed with bash-4.2.6. bash-4.1.x works with both variants.

  Matthias