diff options
Diffstat (limited to 'absl/log/internal/globals.cc')
| -rw-r--r-- | absl/log/internal/globals.cc | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/absl/log/internal/globals.cc b/absl/log/internal/globals.cc index 863b047f..359858f1 100644 --- a/absl/log/internal/globals.cc +++ b/absl/log/internal/globals.cc @@ -17,11 +17,16 @@ #include <atomic> #include <cstdio> +#if defined(__EMSCRIPTEN__) +#include <emscripten/console.h> +#endif + #include "absl/base/attributes.h" #include "absl/base/config.h" #include "absl/base/internal/raw_logging.h" #include "absl/base/log_severity.h" #include "absl/strings/string_view.h" +#include "absl/strings/strip.h" #include "absl/time/time.h" namespace absl { @@ -55,9 +60,24 @@ void SetInitialized() { } void WriteToStderr(absl::string_view message, absl::LogSeverity severity) { + if (message.empty()) return; +#if defined(__EMSCRIPTEN__) + // In WebAssembly, bypass filesystem emulation via fwrite. + // Skip a trailing newline character as emscripten_errn adds one itself. + const auto message_minus_newline = absl::StripSuffix(message, "\n"); + // emscripten_errn was introduced in 3.1.41 but broken in standalone mode + // until 3.1.43. +#if ABSL_INTERNAL_EMSCRIPTEN_VERSION >= 3001043 + emscripten_errn(message_minus_newline.data(), message_minus_newline.size()); +#else + std::string null_terminated_message(message_minus_newline); + _emscripten_err(null_terminated_message.c_str()); +#endif +#else // Avoid using std::cerr from this module since we may get called during // exit code, and cerr may be partially or fully destroyed by then. std::fwrite(message.data(), message.size(), 1, stderr); +#endif #if defined(_WIN64) || defined(_WIN32) || defined(_WIN16) // C99 requires stderr to not be fully-buffered by default (7.19.3.7), but |