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configure: check $CC available before verifying host CPU

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When executing 'configure' in a fresh QEMU clone, in a fresh
OS install running in a ppc64le host, this is the error
shown:

-----

../configure --enable-trace-backend=simple --enable-debug
    --target-list=ppc64-softmmu

ERROR: Unsupported CPU = ppc64le, try --enable-tcg-interpreter

-----

This isn't true, ppc64le host CPU is supported. This happens because,
in a fresh install, we don't have a C compiler to autodetect
the $cpu variable to "ppc64".

This patch moves the CC available check up a bit, just before verifying
the host CPU. This ensures that we bail out with a $CC not available
error instead of unsupported CPU (the host CPU detection without
the compiler wouldn't work properly anyway). It also allows --help to
keep working without a C compiler. With this patch, in the same ppc64le
host without gcc:

$ ../configure --enable-trace-backend=simple --enable-debug
    --target-list=ppc64-softmmu

ERROR: "cc" either does not exist or does not work

$ ../configure --help

Usage: configure [options]
Options: [defaults in brackets after descriptions]

Standard options:
  --help                   print this message
  --prefix=PREFIX          install in PREFIX [/usr/local]
  --interp-prefix=PREFIX   where to find shared libraries, etc.
(...)

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Daniel Henrique Barboza 2017-11-02 07:09:06 -02:00 committed by Michael Tokarev
parent 6b1a756112
commit 9aae6e549d
1 changed files with 14 additions and 11 deletions
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25
configure vendored
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@ -1582,6 +1582,20 @@ fi
# Suppress writing compiled files
python="$python -B"
# Check that the C compiler works. Doing this here before testing
# the host CPU ensures that we had a valid CC to autodetect the
# $cpu var (and we should bail right here if that's not the case).
# It also allows the help message to be printed without a CC.
write_c_skeleton;
if compile_object ; then
: C compiler works ok
else
error_exit "\"$cc\" either does not exist or does not work"
fi
if ! compile_prog ; then
error_exit "\"$cc\" cannot build an executable (is your linker broken?)"
fi
# Now we have handled --enable-tcg-interpreter and know we're not just
# printing the help message, bail out if the host CPU isn't supported.
if test "$ARCH" = "unknown"; then
@ -1603,17 +1617,6 @@ if test -z "$werror" ; then
fi
fi
# check that the C compiler works.
write_c_skeleton;
if compile_object ; then
: C compiler works ok
else
error_exit "\"$cc\" either does not exist or does not work"
fi
if ! compile_prog ; then
error_exit "\"$cc\" cannot build an executable (is your linker broken?)"
fi
if test "$bogus_os" = "yes"; then
# Now that we know that we're not printing the help and that
# the compiler works (so the results of the check_defines we used