Re: [PULL for-5.0 07/10] configure: Support -static-pie if requested

[Laurent Vivier]

On 31/03/2020 15:34, Laurent Vivier wrote:
> On 31/03/2020 05:54, Richard Henderson wrote:
>> Recent toolchains support static and pie at the same time.
>>
>> As with normal dynamic builds, allow --static to default to PIE
>> if supported by the toolchain.  Allow --enable/--disable-pie to
>> override the default.
>>
>> Reviewed-by: Alex Bennée <address@hidden>
>> Signed-off-by: Richard Henderson <address@hidden>
>> ---
>> v2: Fix --disable-pie --static
>> v3: Update for QEMU_LDFLAGS.
>> ---
>>  configure | 19 ++++++++++++-------
>>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> 'configure --static" always produces a dynamically linked binary for me
> 
> .../configure' '--disable-system' '--enable-user' '--disable-tools'
> '--static'
> ...
> CFLAGS            -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -g
> QEMU_CFLAGS         -Werror  -pthread -I/usr/include/glib-2.0
> -I/usr/lib64/glib-2.0/include  -fPIE -DPIE -m64 -mcx16 -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 -fwrapv -std=gnu99
> -Wexpansion-to-defined -Wendif-labels -Wno-shift-negative-value
> -Wno-missing-include-dirs -Wempty-body -Wnested-externs
> -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers
> -Wold-style-declaration -Wold-style-definition -Wtype-limits
> -fstack-protector-strong  -I/usr/include/libdrm
> -I$(SRC_PATH)/capstone/include
> QEMU_LDFLAGS       -Wl,--warn-common -Wl,-z,relro -Wl,-z,now -static-pie
> -m64  -fstack-protector-strong
> ...
> static build      yes
> ...
> PIE               yes
> 
> make -j 8 m68k-linux-user/clean
> make -j 8 m68k-linux-user/all
> 
> $ file m68k-linux-user/qemu-m68k
> m68k-linux-user/qemu-m68k: ELF 64-bit LSB pie executable, x86-64,
> version 1 (GNU/Linux), dynamically linked,
> BuildID[sha1]=363ee31697e874085ec53c2af454a070c62647e1, for GNU/Linux
> 3.2.0, with debug_info, not stripped, too many notes (256)
> 
> $ gdb --version
> GNU gdb (GDB) Fedora 8.3.50.20190824-30.fc31
> Copyright (C) 2019 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
>  ld --version
> GNU ld version 2.32-31.fc31
> Copyright (C) 2019 Free Software Foundation, Inc.
> This program is free software; you may redistribute it under the terms of
> the GNU General Public License version 3 or (at your option) a later
> version.
> This program has absolutely no warranty.
> 
> Any idea of what happens?

In fact, the binary works well in a chroot, so it should be  a bug in
"file" command.

Thanks,
Laurent