[r16-6205 Regression] FAIL: 26_numerics/random/negative_binomial_distribution/operators/58302.cc -std=gnu++20 (test for excess errors) on Linux/x86_64

Haochen Jiang via Gcc-regression <[email protected]>
Newsgroups gmane.comp.gcc.regression,gmane.comp.gcc.patches
Message-ID <[email protected]>
On Linux/x86_64,

837c21e1aab850126e91eee9b8944aa2baca9ad5 is the first bad commit
commit 837c21e1aab850126e91eee9b8944aa2baca9ad5
Author: Tomasz Kamiński <[email protected]>
Date:   Wed Dec 17 10:32:54 2025 +0100

    libstdc++: Make declaration and definition of generate_canonical consistent.

caused

FAIL: 26_numerics/random/discrete_distribution/operators/call-default.cc  -std=gnu++20 (test for excess errors)
FAIL: 26_numerics/random/negative_binomial_distribution/operators/58302.cc  -std=gnu++20 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-6205/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=26_numerics/random/discrete_distribution/operators/call-default.cc --target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=26_numerics/random/discrete_distribution/operators/call-default.cc --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=26_numerics/random/negative_binomial_distribution/operators/58302.cc --target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=26_numerics/random/negative_binomial_distribution/operators/58302.cc --target_board='unix{-m32\ -march=cascadelake}'"

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