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Re: [Qemu-devel] [PATCH for-2.0] configure: use do_cc when checking for
From: |
Alexey Kardashevskiy |
Subject: |
Re: [Qemu-devel] [PATCH for-2.0] configure: use do_cc when checking for -fstack-protector support |
Date: |
Sat, 12 Apr 2014 00:24:16 +1000 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 04/11/2014 10:34 PM, Alexey Kardashevskiy wrote:
> On 04/09/2014 09:04 PM, Peter Maydell wrote:
>> MacOSX clang silently swallows unrecognized -f options when doing a link
>> with '-framework' also on the command line, so to detect support for
>> the various -fstack-protector options we must do a plain .c to .o compile,
>> not a complete compile-and-link.
>>
>> Signed-off-by: Peter Maydell <address@hidden>
>> ---
>> This should be a pretty safe change and it prevents clang/MacOSX
>> builds from spewing a warning on every C file compilation, so I'd
>> like to get it into 2.0.
>>
>> configure | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/configure b/configure
>> index eb0e7bb..c85475f 100755
>> --- a/configure
>> +++ b/configure
>> @@ -1448,7 +1448,7 @@ done
>> if test "$stack_protector" != "no" ; then
>> gcc_flags="-fstack-protector-strong -fstack-protector-all"
>> for flag in $gcc_flags; do
>> - if compile_prog "-Werror $flag" "" ; then
>> + if do_cc $QEMU_CFLAGS -Werror $flag -c -o $TMPO $TMPC ; then
>> QEMU_CFLAGS="$QEMU_CFLAGS $flag"
>> LIBTOOLFLAGS="$LIBTOOLFLAGS -Wc,$flag"
>> break
>>
>
> My cross environment fails after this patch on "-fstack-protector-all".
> Without the patch, gcc for test program gets additional "-m64 -g
> -L/home/alexey/crosslib/qemu-build-lib-fc19/usr/lib64" (the last one is
> mine, passed via --extra-ldflags=), fails with an error (below). With the
> patch, the configure script thinks everything is fine and fails on "ERROR:
> zlib check failed".
>
> Why is this happening? Thanks.
This helps. No idea why. Any ideas? :)
@@ -1448,7 +1452,7 @@ done
if test "$stack_protector" != "no" ; then
gcc_flags="-fstack-protector-strong -fstack-protector-all"
for flag in $gcc_flags; do
- if do_cc $QEMU_CFLAGS -Werror $flag -c -o $TMPO $TMPC ; then
+ if do_cc $QEMU_CFLAGS -Werror $flag -c -o $TMPO $TMPC "" ; then
QEMU_CFLAGS="$QEMU_CFLAGS $flag"
LIBTOOLFLAGS="$LIBTOOLFLAGS -Wc,$flag"
break
>
>
>
> powerpc64-linux-gcc -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
> -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef
> -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common
> --sysroot=/home/alexey/crosslib/qemu-build-lib-fc19/ -isystem
> /home/alexey/crosslib/qemu-build-lib-fc19/usr/include -D__EXCEPTIONS
> -D__LONG_DOUBLE_128__ -D__NO_INLINE__ -Wno-redundant-decls
> -Wno-missing-prototypes -Wmissing-include-dirs -Wno-system-headers
> -Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs
> -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers
> -Wold-style-declaration -Wold-style-definition -Wtype-limits -Werror
> -fstack-protector-strong -o /tmp/qemu-conf-24556-2284-15038.exe
> /tmp/qemu-conf-31026-2284-18135.c -m64 -g
> -L/home/alexey/crosslib/qemu-build-lib-fc19/usr/lib64
> powerpc64-linux-gcc: error: unrecognized command line option
> '-fstack-protector-strong'
> powerpc64-linux-gcc -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
> -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef
> -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common
> --sysroot=/home/alexey/crosslib/qemu-build-lib-fc19/ -isystem
> /home/alexey/crosslib/qemu-build-lib-fc19/usr/include -D__EXCEPTIONS
> -D__LONG_DOUBLE_128__ -D__NO_INLINE__ -Wno-redundant-decls
> -Wno-missing-prototypes -Wmissing-include-dirs -Wno-system-headers
> -Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs
> -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers
> -Wold-style-declaration -Wold-style-definition -Wtype-limits -Werror
> -fstack-protector-all -o /tmp/qemu-conf-24556-2284-15038.exe
> /tmp/qemu-conf-31026-2284-18135.c -m64 -g
> -L/home/alexey/crosslib/qemu-build-lib-fc19/usr/lib64
> /home/system/opt/cross/gcc-4.8.0-nolibc/powerpc64-linux/bin/../lib/gcc/powerpc64-linux/4.8.0/../../../../powerpc64-linux/bin/ld:
> cannot find -lssp_nonshared
> /home/system/opt/cross/gcc-4.8.0-nolibc/powerpc64-linux/bin/../lib/gcc/powerpc64-linux/4.8.0/../../../../powerpc64-linux/bin/ld:
> cannot find -lssp
> collect2: error: ld returned 1 exit status
>
>
>
>
--
Alexey