The --enable-strict flag is unspecified in the ebuild, so it defaults to "yes", which adds -std=c11 to CFLAGS: https://github.com/unicode-org/icu/blob/master/icu4c/source/acinclude.m4#L472 With -std=c11, the __USE_MISC feature macro is undefined. The required macros for the autoconf AC_C_BIGENDIAN test are gated on "#ifdef __USE_MISC" in <endian.h>: https://github.com/unicode-org/icu/blob/master/icu4c/source/configure#L6593-L6597 Since that test fails, the fallback test tries to grep for strings in a compiled object file. That fails because of LTO mangling the file's constants, and it can't run a final fallback test with native execution because of cross-compiling. Reproducible: Always Steps to Reproduce: 1. CFLAGS=-flto cross-emerge -v dev-libs/icu Actual Results: checking whether byte ordering is bigendian... unknown configure: error: unknown endianness presetting ac_cv_c_bigendian=no (or yes) will help Expected Results: It should build and install. There are a few workarounds like setting EXTRA_ECONF=--disable-strict or ac_cv_c_bigendian=no in the environment or disabling LTO, but I don't know what would be an acceptable fix to apply to the ebuild. Maybe this combo would be the least intrusive: tc-is-cross-compiler && is-flagq "-flto*" && myeconfargs+=( --disable-strict )
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a4484fc63431d84fd0b366557d1c8a5df964d1c0 commit a4484fc63431d84fd0b366557d1c8a5df964d1c0 Author: David Michael <fedora.dm0@gmail.com> AuthorDate: 2021-03-22 10:06:22 +0000 Commit: David Seifert <soap@gentoo.org> CommitDate: 2021-03-22 10:06:22 +0000 dev-libs/icu: work around cross-endian tests failing The tests need __USE_MISC, which is undefined by -std=c11, which is added by --enable-strict, which is the default setting. There are fallback tests that work for native builds and non-LTO builds, but this specific case has no fallback and requires this workaround. Closes: https://bugs.gentoo.org/757681 Package-Manager: Portage-3.0.13, Repoman-3.0.2 Signed-off-by: David Michael <fedora.dm0@gmail.com> Signed-off-by: David Seifert <soap@gentoo.org> dev-libs/icu/icu-68.2.ebuild | 5 +++++ 1 file changed, 5 insertions(+)
