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Dynamically link libc++, if integrating with system LLVM

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This ensures that the zigcpp clang driver and LLVM are using the
same copy of libc++. See prior commit for more details.
This commit is contained in:
Cody Tapscott 2022-07-11 18:47:54 -07:00
parent b0525344a2
commit f1feb1369b
1 changed files with 10 additions and 6 deletions
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16
build.zig
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@ -565,13 +565,17 @@ fn addCmakeCfgOptionsToExe(
exe.linkLibCpp();
} else {
const need_cpp_includes = true;
const lib_suffix = switch (cfg.llvm_linkage) {
.static => exe.target.staticLibSuffix()[1..],
.dynamic => exe.target.dynamicLibSuffix()[1..],
};
// System -lc++ must be used because in this code path we are attempting to link
// against system-provided LLVM, Clang, LLD.
if (exe.target.getOsTag() == .linux) {
// First we try to static link against gcc libstdc++. If that doesn't work,
// we fall back to -lc++ and cross our fingers.
addCxxKnownPath(b, cfg, exe, "libstdc++.a", "", need_cpp_includes) catch |err| switch (err) {
// First we try to link against gcc libstdc++. If that doesn't work, we fall
// back to -lc++ and cross our fingers.
addCxxKnownPath(b, cfg, exe, b.fmt("libstdc++.{s}", .{lib_suffix}), "", need_cpp_includes) catch |err| switch (err) {
error.RequiredLibraryNotFound => {
exe.linkSystemLibrary("c++");
},
@ -579,11 +583,11 @@ fn addCmakeCfgOptionsToExe(
};
exe.linkSystemLibrary("unwind");
} else if (exe.target.isFreeBSD()) {
try addCxxKnownPath(b, cfg, exe, "libc++.a", null, need_cpp_includes);
try addCxxKnownPath(b, cfg, exe, b.fmt("libc++.{s}", .{lib_suffix}), null, need_cpp_includes);
exe.linkSystemLibrary("pthread");
} else if (exe.target.getOsTag() == .openbsd) {
try addCxxKnownPath(b, cfg, exe, "libc++.a", null, need_cpp_includes);
try addCxxKnownPath(b, cfg, exe, "libc++abi.a", null, need_cpp_includes);
try addCxxKnownPath(b, cfg, exe, b.fmt("libc++.{s}", .{lib_suffix}), null, need_cpp_includes);
try addCxxKnownPath(b, cfg, exe, b.fmt("libc++abi.{s}", .{lib_suffix}), null, need_cpp_includes);
} else if (exe.target.isDarwin()) {
exe.linkSystemLibrary("c++");
}