On Linux/x86_64,

527a1cf32c27a3fbeaf6be7596241570d864cc4c is the first bad commit
commit 527a1cf32c27a3fbeaf6be7596241570d864cc4c
Author: Tobias Burnus <tob...@codesourcery.com>
Date:   Mon Aug 9 12:35:23 2021 +0200

    testsuite/lib/gfortran.exp: Add -I for ISO*.h [PR101305, PR101660]

caused

FAIL: gfortran.dg/ieee/dec_math_1.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/dec_math_1.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/dec_math_1.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/dec_math_1.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/dec_math_1.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/dec_math_1.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_10.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_10.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_10.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_10.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_10.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_10.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_1.F90   -O0  execution test
FAIL: gfortran.dg/ieee/ieee_1.F90   -O1  execution test
FAIL: gfortran.dg/ieee/ieee_1.F90   -O2  execution test
FAIL: gfortran.dg/ieee/ieee_1.F90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  execution test
FAIL: gfortran.dg/ieee/ieee_1.F90   -O3 -g  execution test
FAIL: gfortran.dg/ieee/ieee_1.F90   -Os  execution test
FAIL: gfortran.dg/ieee/ieee_3.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_3.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_3.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_3.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_3.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_3.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_4.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_4.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_4.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_4.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_4.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_4.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_6.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_6.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_6.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_6.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_6.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_6.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_7.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_7.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_7.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_7.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_7.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_7.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_8.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_8.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_8.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_8.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_8.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_8.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_9.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_9.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_9.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_9.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_9.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/ieee_9.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/large_1.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/large_1.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/large_1.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/large_1.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/large_1.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/large_1.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/large_3.F90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/large_3.F90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/large_3.F90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/large_3.F90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/large_3.F90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/large_3.F90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/large_4.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/ieee/large_4.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/ieee/large_4.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/ieee/large_4.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/ieee/large_4.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/ieee/large_4.f90   -Os  (test for excess errors)
FAIL: gfortran.dg/ieee/pr77372.f90   -O  (test for excess errors)

with GCC configured with



To reproduce:

$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/dec_math_1.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/dec_math_1.f90 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/dec_math_1.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/dec_math_1.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_10.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_10.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_10.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_10.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_1.F90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_1.F90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_1.F90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_1.F90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_3.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_3.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_3.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_3.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_4.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_4.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_4.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_4.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_6.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_6.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_6.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_6.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_7.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_7.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_7.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_7.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_8.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_8.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_8.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_8.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_9.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_9.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_9.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/ieee_9.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_1.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_1.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_1.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_1.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_3.F90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_3.F90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_3.F90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_3.F90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_4.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_4.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_4.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/large_4.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/pr77372.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/pr77372.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/pr77372.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ieee.exp=gfortran.dg/ieee/pr77372.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"

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