diff options
Diffstat (limited to 'libbuild2/cc/compile-rule.cxx')
| -rw-r--r-- | libbuild2/cc/compile-rule.cxx | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx index 29312a8..37daf76 100644 --- a/libbuild2/cc/compile-rule.cxx +++ b/libbuild2/cc/compile-rule.cxx @@ -5939,11 +5939,11 @@ namespace build2 append_sys_inc_options (args); // Extra system header dirs (last). // While we want to keep the low-level build as "pure" as possible, - // the two misguided defaults, exceptions and runtime, just have to be - // fixed. Otherwise the default build is pretty much unusable. But we - // also make sure that the user can easily disable our defaults: if we - // see any relevant options explicitly specified, we take our hands - // off. + // the two misguided defaults, C++ exceptions and runtime, just have + // to be fixed. Otherwise the default build is pretty much unusable. + // But we also make sure that the user can easily disable our + // defaults: if we see any relevant options explicitly specified, we + // take our hands off. // // For C looks like no /EH* (exceptions supported but no C++ objects // destroyed) is a reasonable default. @@ -6049,6 +6049,28 @@ namespace build2 { case compiler_type::clang: { + // Default to the /EHsc exceptions support for C++, similar to + // the the MSVC case above. + // + // Note that both vanilla clang++ and clang-cl drivers add + // -fexceptions and -fcxx-exceptions by default. However, + // clang-cl also adds -fexternc-nounwind, which implements the + // 'c' part in /EHsc. Note that adding this option is not a mere + // optimization, as we have discovered through some painful + // experience; see Clang bug #45021. + // + // Let's also omit this option if -f[no]-exceptions is specified + // explicitly. + // + if (x_lang == lang::cxx) + { + if (!find_options ({"-fexceptions", "-fno-exceptions"}, args)) + { + args.push_back ("-Xclang"); + args.push_back ("-fexternc-nounwind"); + } + } + // Default to the multi-threaded DLL runtime (/MD), similar to // the MSVC case above. // |