[Buildroot] [PATCH v2, 1/1] toolchain/toolchain-wrapper: fix gcc -v with relro
Yann E. MORIN
yann.morin.1998 at free.fr
Fri Dec 25 22:38:39 UTC 2020
Fabrice, All,
On 2020-12-24 11:18 +0100, Fabrice Fontaine spake thusly:
> rhash in version 1.4.0 with relro fails to build because gcc -v raises
> the following build failure:
>
> /data/buildroot-test/instance-1/output-1/host/mips64el-buildroot-linux-gnu/sysroot/soft-float/el/usr/lib64/Scrt1.o: In function `__start':
> (.text+0x20): undefined reference to `main'
> collect2: error: ld returned 1 exit status
> Run result: 1
>
> This build failure is raised because the toolchain-wrapper calls gcc with
> -Wl,-z,relro and as a result gcc wrongly assumes that some linking must
> be done.
>
> Fixes:
> - http://autobuild.buildroot.org/results/8605c16cc28316954ce8b9dcc266974390c5da20
I have applied a tweaked version of your previous rhash fix, now.
I still believe this change in the toolchain wrapper to be missing extra
safeguards, as calling -v to do an actual link step is still valid. With
your patch, the link would thus be done without -z relro, which is not
correct.
But since the rhash build has now been fixed with a patch in rhash, I
don;t think we need to investigate further in our toolchain wrapper for
the time being. If there are more packages impacted, we can revisit
later.
Thanks you! :-)
Regards,
Yann E. MORIN.
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> Tested-by: Peter Seiderer <ps.report at gmx.net>
> ---
> Changes v1 -> v2 (after review of Peter Seiderer):
> - Fix typos in commit log and update comment in source code
>
> toolchain/toolchain-wrapper.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c
> index 0fb6064b1c..2a7dd61729 100644
> --- a/toolchain/toolchain-wrapper.c
> +++ b/toolchain/toolchain-wrapper.c
> @@ -453,10 +453,11 @@ int main(int argc, char **argv)
> *cur++ = "-pie";
> }
> #endif
> - /* Are we building the Linux Kernel or U-Boot? */
> + /* Are we building the Linux Kernel or U-Boot or displaying the programs invoked by the compiler? */
> for (i = 1; i < argc; i++) {
> if (!strcmp(argv[i], "-D__KERNEL__") ||
> - !strcmp(argv[i], "-D__UBOOT__"))
> + !strcmp(argv[i], "-D__UBOOT__") ||
> + !strcmp(argv[i], "-v"))
> break;
> }
> if (i == argc) {
> --
> 2.29.2
>
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