[Bug other/86890] GCC 8.2.0 fails to build with isl 0.20
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86890 --- Comment #1 from graham.stott77 at gmail dot com --- isl 0.18 is the supported version for gcc 8 branch. Original message From: freddie_chopin at op dot pl Date: 08/08/2018 16:04 (GMT+00:00) To: gcc-bugs@gcc.gnu.org Subject: [Bug other/86890] New: GCC 8.2.0 fails to build with isl 0.20 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86890 Bug ID: 86890 Summary: GCC 8.2.0 fails to build with isl 0.20 Product: gcc Version: 8.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: other Assignee: unassigned at gcc dot gnu.org Reporter: freddie_chopin at op dot pl Target Milestone: --- When trying to build GCC 8.2.0 with isl 0.20, I see a lot (at least a few dozens) of errors about undeclared functions, like: -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- g++ -fno-PIE -c -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -DHAVE_CONFIG_H -I. -I. -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/. -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/../include -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/../libcpp/include -I/home/freddie/bleeding-edge-toolchain/buildNative/prerequisites/gmp-6.1.2/include -I/home/freddie/bleeding-edge-toolchain/buildNative/prerequisites/mpfr-4.0.1/include -I/home/freddie/bleeding-edge-toolchain/buildNative/prerequisites/mpc-1.1.0/include -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/../libdecnumber -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/../libdecnumber/dpd -I../libdecnumber -I/home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/../libbacktrace -I/home/freddie/bleeding-edge-toolchain/buildNative/prerequisites/isl-0.20/include -I/home/freddie/bleeding-edge-toolchain/buildNative/prerequisites/zlib-1.2.11/include -pipe -o graphite-isl-ast-to-gimple.o -MT graphite-isl-ast-to-gimple.o -MMD -MP -MF ./.deps/graphite-isl-ast-to-gimple.TPo /home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/graphite-isl-ast-to-gimple.c /home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/graphite-isl-ast-to-gimple.c: In function ‘void ivs_params_clear(ivs_params&)’: /home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/graphite-isl-ast-to-gimple.c:83:7: error: ‘isl_id_free’ was not declared in this scope isl_id_free (it->first); ^~~ /home/freddie/bleeding-edge-toolchain/sources/gcc-8.2.0/gcc/graphite-isl-ast-to-gimple.c:83:7: note: suggested alternative: ‘isl_aff_free’ isl_id_free (it->first); ^~~ isl_aff_free -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- This seems like some header include problems or something like that, as there definitely is a isl_id_free() function in /home/freddie/bleeding-edge-toolchain/buildNative/prerequisites/isl-0.20/include/isl/id.h, which is available in the search path.
[Bug tree-optimization/87546] [9 Regression] Gcc miscompiles at -O3 on valid code
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87546
--- Comment #3 from graham.stott77 at gmail dot com ---
'b' is never assigned a value, so surely it's undefined
Original message
From: helloqirun at gmail dot com
Date: 08/10/2018 04:51 (GMT+00:00)
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87546] New: Gcc miscompiles at -O3 on valid
code
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87546
Bug ID: 87546
Summary: Gcc miscompiles at -O3 on valid code
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: helloqirun at gmail dot com
Target Milestone: ---
It should be a very recent regression.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 9.0.0 20181007 (experimental) [trunk revision 264906] (GCC)
$ gcc-trunk abc.c ; ./a.out
-37
$ gcc-trunk -O3 abc.c ; ./a.out
219
$ cat abc.c
int printf(const char *, ...);
int a;
long b, f;
char c, g;
short d = 219;
int e[7];
int main() {
for (; c <= 6; c++) {
g = d < 0 ? d : d >> a;
f = g + b;
e[c] = f;
}
printf("%d\n", e[1]);
}
