This commit updates the gcc musl patches for gcc 4.7, 4.8 and 4.9 so
that the path to the dynamic linker encoded as "program interpreter"
in the generated binaries actually matches the symbolic link installed
by musl when building for mips soft-float.
Indeed, musl installs a symlink called ld-musl-mipsel-sf.so.1, but gcc
currently generates binaries that use /lib/ld-musl-mips.so as program
interpreter.
The fix is simply the one from
https://bitbucket.org/GregorR/musl-cross/commits/825219202365, i.e
adjust MUSL_DYNAMIC_LINKER in our musl gcc patches.
Thanks to these patches:
$ ./host/usr/bin/mipsel-linux-readelf -a ./target/bin/busybox
[...]
[Requesting program interpreter: /lib/ld-musl-mipsel-sf.so.1]
[...]
gcc 5.x doesn't need any fix because the musl patches already use the
right value.
Fixes bug #7562.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Now that we are always explicitly passing gcc_cv_libc_provides_ssp,
there is no longer any reason to modify the gcc configure/configure.ac
to take into account the musl case. When a musl toolchain is being
built, BR2_TOOLCHAIN_HAS_SSP is always 'y', and therefore
gcc_cv_libc_provides_ssp=yes is always passed when building
gcc-initial and gcc-final.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Following the introduction of the support for the musl C library, the
support of C++ exceptions or features like pthread_exit() got broken
even with other libraries such as glibc. This was reported as bug #7028.
The problem was caused by the gcc patch needed to add support for
musl, which modified the libgcc/unwind-dw2-fde-dip.c logic to decide
whether USE_PT_GNU_EH_FRAME should be enabled or not. It completely
removed the existing logic, replacing it by a single logic based on
the definition of TARGET_DL_ITERATE_PHDR. However, this constant gets
defined by the configure script only for Solaris, or Linux Musl
platforms. For glibc/uClibc, the configure script does not define it,
and therefore USE_PT_GNU_EH_FRAME is not defined, causing issues with
exception handling.
This patch fixes that by restoring all the logic of
libgcc/unwind-dw2-fde-dip.c, and just adding the musl logic as one
more case.
It has been successfully runtime tested using the two code examples
provided in bug #7208, with uClibc, musl and glibc.
Cc: Krzysztof Wrzalik <kwrzalik@gmail.com>
Cc: David Bachelart <david.bachelart@bbright.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
