On Linux/x86_64,

a6d22fb21c6f1ad7e8b6b722bfc0e7e11f50cb92 is the first bad commit
commit a6d22fb21c6f1ad7e8b6b722bfc0e7e11f50cb92
Author: Kwok Cheung Yeung <k...@codesourcery.com>
Date:   Sat Jan 16 12:58:13 2021 -0800

    openmp: Add support for the OpenMP 5.0 task detach clause

caused

FAIL: gfortran.dg/gomp/task-detach-1.f90   -O   (test for errors, line 21)
FAIL: gfortran.dg/gomp/task-detach-1.f90   -O   (test for errors, line 22)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-6752/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}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/task-detach-1.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=gfortran.dg/gomp/task-detach-1.f90 
--target_board='unix{-m32\ -march=cascadelake}'"

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