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package/gcc: help libbacktrace detection of sync builtins

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The logic in libbacktrace/configure.ac to detect if __sync builtins
are available assumes they are as soon as target_subdir is not
empty, i.e when cross-compiling. However, some platforms do not have
__sync builtins, so help the configure script a bit.

"libbacktrace_cv_sys_sync=no" is lost when it is added to
HOST_GCC_COMMON_CONF_ENV because the environment is not exported
when executing the libbacktrace configure script.

Use target_configargs to force "libbacktrace_cv_sys_sync=no" when
executiong the libbacktrace configure script.

Fixes:
https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359681

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Romain: use target_configargs="libbacktrace_cv_sys_sync=no"]
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 0bec4c8a4a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni
2020-09-25 11:04:51 +02:00
committed by Peter Korsgaard
parent 05bd0ab4c1
commit 3d85ce18ba
1 changed files with 8 additions and 0 deletions
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8
package/gcc/gcc.mk
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@@ -141,6 +141,14 @@ ifeq ($(BR2_sparc)$(BR2_sparc64),y)
HOST_GCC_COMMON_CONF_OPTS += --disable-libsanitizer
endif
# The logic in libbacktrace/configure.ac to detect if __sync builtins
# are available assumes they are as soon as target_subdir is not
# empty, i.e when cross-compiling. However, some platforms do not have
# __sync builtins, so help the configure script a bit.
ifeq ($(BR2_TOOLCHAIN_HAS_SYNC_4),)
HOST_GCC_COMMON_CONF_ENV += target_configargs="libbacktrace_cv_sys_sync=no"
endif
# TLS support is not needed on uClibc/no-thread and
# uClibc/linux-threads, otherwise, for all other situations (glibc,
# musl and uClibc/NPTL), we need it.