Hi,
This is just to let you know of a GCC bug in GCC7.4.0 (default in Ubuntu
18.04 LTS) when compiling racketcs.
GCC complains about
vfasl.c:358:134: error: array subscript is above array bounds
[-Werror=array-bounds]
on vfasl.c of Chez sources. However, this is a false positive fixed on
more recent GCC versions. On ubuntu 18.04:
racket/racket/src/ChezScheme/ta6le/c$ apt-get install -y gcc-8
racket/racket/src/ChezScheme/ta6le/c$ gcc -m64 -msse2 -Wpointer-arith
-Wall -Wextra -Werror -Wno-implicit-fallthrough -O2 -D_REENTRANT
-pthread -march=native -O3 -Wall -DELF_FIND_BOOT_SECTION -pthread -c
-DX86_64 -I../boot/ta6le -I../zlib -I../lz4/lib vfasl.c
vfasl.c: In function ‘S_vfasl’:
vfasl.c:352:134: error: array subscript is above array bounds
[-Werror=array-bounds]
MAYBE_FIXUP(0);
...
cc1: all warnings being treated as errors
racket/racket/src/ChezScheme/ta6le/c$ gcc-8 -m64 -msse2 -Wpointer-arith
-Wall -Wextra -Werror -Wno-implicit-fallthrough -O2 -D_REENTRANT
-pthread -march=native -O3 -Wall -DELF_FIND_BOOT_SECTION -pthread -c
-DX86_64 -I../boot/ta6le -I../zlib -I../lz4/lib vfasl.c
$
The broken gcc version:
$ gcc --version
gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Fixed:
$ gcc-8 --version
gcc-8 (Ubuntu 8.3.0-6ubuntu1~18.04) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The might have come in long before 8.3.0 but I haven't run further
tests. This is relevant to know because the bug is in the default GCC
for Ubuntu LTS.
If I find more, I will let you know.
Regards,
--
Paulo Matos
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