https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108347
Bug ID: 108347
Summary: Incorrect error: ambiguous template instantiation
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: CoachHagins at gmail dot com
Target Milestone: ---
Created attachment 54222
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54222&action=edit
C++ source - no include directives
The attached code is a single .cpp file, as it contains no #include directives.
I have also posted on compiler explorer here: https://godbolt.org/z/jjEPKdx8Y
The code compiles fine with all versions of clang from 7 up through the latest
branch on CE.
The code FAILS to compile with gcc, all versions from 7 up through the latest
branch on CE.
There are THREE #defines in the included code, which provide three different
"fixes" to make the code compile.
The command
g++ -std=c++17 -DFIX0=0 -DFIX1=0 -DFIX2=0
will fail to compile with an ambiguous template instantiation error. However,
all of the following will allow the code to compile. Hopefully, the various
"fixes" will help identify the underlying issue(s).
g++ -std=c++17 -DFIX0=0 -DFIX1=0 -DFIX2=1
g++ -std=c++17 -DFIX0=0 -DFIX1=1 -DFIX2=0
g++ -std=c++17 -DFIX0=0 -DFIX1=1 -DFIX2=1
g++ -std=c++17 -DFIX0=1 -DFIX1=0 -DFIX2=0
g++ -std=c++17 -DFIX0=1 -DFIX1=0 -DFIX2=1
g++ -std=c++17 -DFIX0=1 -DFIX1=1 -DFIX2=0
g++ -std=c++17 -DFIX0=1 -DFIX1=1 -DFIX2=1
