https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115077
Bug ID: 115077
Summary: bootstrap fails with in-tree isl-0.25/6
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: iains at gcc dot gnu.org
Target Milestone: ---
see also this thread: https://gcc.gnu.org/pipermail/gcc/2024-May/243949.htm
version 0.25 and 0.26 have test cases that require c++17 support.
Essentially we have a stage1 bootstrap fail with errors of the form
"
/src-local/gcc-master/isl/isl_test_cpp17-generic.cc: In function ‘isl::id
construct_id(isl::ctx, bool*)’:
/src-local/gcc-master/isl/isl_test_cpp17-generic.cc:25:24: error: no matching
function for call to ‘isl::id::id(isl::ctx&, const char [2],
std::shared_ptr<S>&)’
25 | isl::id id(ctx, "S", s);
"
because we are somehow mismatching the build flags and the configure ones.
=====
The isl configure checks for this support using AX_CXX_COMPILE_STDCXX_17 which
updates CXX to include the addition of -std=c++17, if that is required to
enable it.
The test cases are then added on HAVE_CXX17
The isl (stage1) Makefile contains (for an example on Darwin)
CXX = x86_64-apple-darwin21-g++ -std=c++11 -std=gnu++17
CXXCPP = x86_64-apple-darwin21-g++ -std=c++11 -std=gnu++17 -E
Which is correct.
However somehow we are overriding this in the actual build:
x86_64-apple-darwin21-g++ -std=c++11 -DHAVE_CONFIG_H -I.
-I/src-local/gcc-master/isl -I/src-local/gcc-master/isl/include -Iinclude/
-I/src-local/gcc-master/gmp -I/scratch/12-mon-rosetta/gcc-master/./gmp -O
-pipe -MT isl_test_cpp17.o -MD -MP -MF $depbase.Tpo -c -o isl_test_cpp17.o
/src-local/gcc-master/isl/isl_test_cpp17.cc &&\
mv -f $depbase.Tpo $depbase.Po
