Re: [Buildroot] [PATCH v2] package/erlang: disable for uclibc, fix glibc-build

[Peter Korsgaard <peter@korsgaard.com>]

>>>>>   <yann.morin@orange.com> writes:

 > From: "Yann E. MORIN" <yann.morin@orange.com>
 > Commit 2cfa86a54882(package/erlang: bump version to 26.0.2) added a
 > patch to restore building on uClibc.

 > However, that patch is not upstream, and has been rejected:

 >     https://github.com/erlang/otp/pull/7500

 >     Please open a PR to https://github.com/asmjit/asmjit instead and we
 >     will get the fix next time we sync with upstream. We do not want
 >     theirs and our implementation to diverge.

 > Furthermore, it happens to work on uClibc, because uClibc does not
 > expose sys/auxv.h, but it fails to work on glibc, because the define is
 > not propagated to "sub-trees", and thus is never defined where it is
 > checked for, even when sys/auxv.h is available. This causes build
 > failures such as:

 >     asmjit/core/cpuinfo.cpp: In function ‘void asmjit::_abi_1_10::detectHWCaps(CpuInfo&, long unsigned int, const LinuxHWCapMapping*, size_t)’:
 >     asmjit/core/cpuinfo.cpp:840:24: error: ‘getauxval’ was not declared in this scope
 >       840 |   unsigned long mask = getauxval(type);
 >           |                        ^~~~~~~~~
 >     asmjit/core/cpuinfo.cpp: In function ‘void asmjit::_abi_1_10::detectARMCpu(CpuInfo&)’:
 >     asmjit/core/cpuinfo.cpp:972:21: error: ‘AT_HWCAP’ was not declared in this scope
 >       972 |   detectHWCaps(cpu, AT_HWCAP, hwCapMapping, ASMJIT_ARRAY_SIZE(hwCapMapping));
 >           |                     ^~~~~~~~
 >     asmjit/core/cpuinfo.cpp:973:21: error: ‘AT_HWCAP2’ was not declared in this scope
 >       973 |   detectHWCaps(cpu, AT_HWCAP2, hwCapMapping2, ASMJIT_ARRAY_SIZE(hwCapMapping2));
 >           |                     ^~~~~~~~~

 > Yet, sys/auxv.h was detected at configure time:

 >     checking for sys/auxv.h... yes

 > This defconfig is enough to reproduce the error:

 >     BR2_aarch64=y
 >     BR2_TOOLCHAIN_EXTERNAL=y
 >     BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
 >     BR2_PACKAGE_ERLANG=y

 > Since upstream refused the patch, and there is no fix that was submitted
 > to the actual upstream (asmjit), drop the rejectred patch, and disable
 > for uClibc: the patch is incorrect, and we can't fix a build issue on
 > uClibc by introducing another on glibc.

 > Fixes:
 >     http://autobuild.buildroot.org/results/fc1/fc19bad2263bdfacea594217d5ddfde0e27895b1/
 >     http://autobuild.buildroot.org/results/114/11416d81d5b27fc0627b335a971154c088d5754a/

 > Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
 > Cc: Bernd Kuhls <bernd@kuhls.net>
 > Cc: Maxim Kochetkov <fido_max@inbox.ru>

 > Changes v1 -> v2:
 >   - update comment when unavailable

Committed to 2023.08.x, thanks.

-- 
Bye, Peter Korsgaard
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