https://llvm.org/bugs/show_bug.cgi?id=31409
Bug ID: 31409
Summary: Fail to link instantiation of basic_regex with a
custom character type
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ka...@codesynthesis.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
Trying to instantiate std::basic_regex template with a custom character type
results in a linker error like this:
driver.o:(.rodata._ZTVNSt3__123__match_any_but_newlineIN6build24test6script5regex9line_charEEE[_ZTVNSt3__123__match_any_but_newlineIN6build24test6script5regex9line_charEEE]+0x20):
undefined reference to
`std::__1::__match_any_but_newline<build2::test::script::regex::line_char>::__exec(std::__1::__state<build2::test::script::regex::line_char>&)
const'
That happens as libc++ only provides specialization of
__match_any_but_newline::__exec() for char and wchar_t types, and lacks
implementation which would be available for any other instantiation of the
__match_any_but_newline template.
Probably it would be right to assume that a custom character type can have no
notion of a newline character at all. As a real life example, in build2
toolchain we develop, such a character represents a line of a program output,
or an inner level regex matching such a line, or a syntax regex character.
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