https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98645
Bug ID: 98645
Summary: C++ modules support does not work on PowerPC with IEEE
128-bit long double
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Target Milestone: ---
I am tuning up the final patches for providing support to enable the PowerPC
server compilers to change the default long double from using the IBM 128-bit
double double format to IEEE 128-bit.
When the default long double is IEEE 128-bit, the powerpc backend needs to
create a new type (__ibm128) to allow access to the old IBM 128-bit format. It
looks like the gcc/cp/module.cc code does not have a method of dealing with
target specific floating point types.
If you build a compiler with IEEE 128-bit long double default, the following
tests now fail:
$ make check-c++ RUNTESTFLAGS=modules.exp
Running /home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/modules.exp
...
FAIL: g++.dg/modules/binding-1_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/binding-1_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/binding-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/binding-1_a.H.gcm)
FAIL: g++.dg/modules/binding-1_b.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/binding-1_b.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/binding-1_b.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/binding-1_b.H.gcm)
FAIL: g++.dg/modules/binding-1_c.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/binding-1_c.C module-cmi hello (gcm.cache/hello.gcm)
FAIL: g++.dg/modules/binding-1_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/binding-1_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/binding-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/binding-1_a.H.gcm)
FAIL: g++.dg/modules/binding-1_b.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/binding-1_b.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/binding-1_b.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/binding-1_b.H.gcm)
FAIL: g++.dg/modules/binding-1_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/binding-1_c.C module-cmi hello (gcm.cache/hello.gcm)
FAIL: g++.dg/modules/hello-1_a.C -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/hello-1_a.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/hello-1_a.C module-cmi hello (gcm.cache/hello.gcm)
FAIL: g++.dg/modules/hello-1_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/hello-1_a.C -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/hello-1_a.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/hello-1_a.C module-cmi hello (gcm.cache/hello.gcm)
FAIL: g++.dg/modules/hello-1_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/iostream-1_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/iostream-1_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/iostream-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/iostream-1_a.H.gcm)
FAIL: g++.dg/modules/iostream-1_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/iostream-1_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/iostream-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/iostream-1_a.H.gcm)
FAIL: g++.dg/modules/iostream-1_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/string-1_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/string-1_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/string-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/string-1_a.H.gcm)
FAIL: g++.dg/modules/string-1_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/string-1_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/string-1_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/string-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/string-1_a.H.gcm)
FAIL: g++.dg/modules/string-1_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-1_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-1_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-1_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-1_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-1_c.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-1_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-1_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-1_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-1_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-1_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-2_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-2_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_c.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-2_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-2_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-3_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-3_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_c.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-3_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-3_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-4_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-4_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-4_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-4_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-4_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-4_c.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-4_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-4_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-4_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-4_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-4_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-4_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-5_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-5_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_c.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-5_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-5_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-6_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-6_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-6_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-header-6_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-6_b.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-6_c.C -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++17 (internal compiler error)
FAIL: g++.dg/modules/xtreme-tr1_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-tr1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-tr1_a.H.gcm)
FAIL: g++.dg/modules/xtreme-tr1_b.C -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-tr1_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-tr1_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-tr1_a.H module-cmi
(gcm.cache/home/meissner/fsf-src/trunk/gcc/testsuite/g++.dg/modules/xtreme-tr1_a.H.gcm)
FAIL: g++.dg/modules/xtreme-tr1_b.C -std=c++2a (test for excess errors)
=== g++ Summary ===
# of expected passes 4083
# of unexpected failures 111
# of expected failures 6
# of unresolved testcases 8
It looks like it is failing at gcc/cp/module.cc in two places because the
switch statement did not have a case for REAL_TYPE: Line 8776 (in
trees_out::type_node) and line 9288 (in trees_in::type_node).
There are patches that will be needed for the full IEEE 128-bit long double
support (for built-ins and Decimal/IEEE support), but the current code will
show the problem.
To configure the compiler, you will need GLIBC 2.32 or newer. I use the
Advance Toolchain which provides GLIBC 2.32. I used the options:
--with-long-double-format=ieee
--with-native-system-header-dir=/opt/at14.0/include
--with-advance-toolchain=at14.0
--disable-bootstrap
