https://bugs.llvm.org/show_bug.cgi?id=41251
Bug ID: 41251
Summary: llvm-config omits flags that are impactful to ABI
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: llvm-config
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
I got this interesting case where clang is built with -stdlib=libc++, and a
plugin is not (because as of https://reviews.llvm.org/D55391, -stdlib=libc++ is
not returned by llvm-config), where the plugin would fail to load because of
the missing symbol:
_ZN5clang12ast_matchers8internal15DynTypedMatcher17constructVariadicENS2_16VariadicOperatorENS_15ast_type_traits11ASTNodeKindESt6vectorIS2_SaIS2_EE
, while clang does have
_ZN5clang12ast_matchers8internal15DynTypedMatcher17constructVariadicENS2_16VariadicOperatorENS_15ast_type_traits11ASTNodeKindENSt3__16vectorIS2_NS6_9allocatorIS2_EEEE
As it turns out, std::vector is in a different namespace in libc++, so
-stdlib=libc++ makes a whole lot of a difference.
I wonder if there are other flags that are left out the same way since that
change.
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