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Fix Emscripten detection false positives and unsuppressible status messages

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Issue 1: False positive Emscripten detection

The check_c_source_compiles() test incorrectly detected Emscripten when
building with non-Emscripten WASM toolchains (e.g., WASI SDK). In cross-
compilation scenarios, CMake creates a static library instead of an
executable for compile tests. An empty source file (when __EMSCRIPTEN__
is not defined) successfully archives into a static library, causing the
test to pass when it should fail.

Resolution: Use the EMSCRIPTEN CMake variable set by Emscripten's official
toolchain file, which is the recommended detection method. Remove the
unreliable check_c_source_compiles() fallback.

Issue 2: Unsuppressible status messages

The message() calls lacked a type argument, making them always print
regardless of CMake's log level settings.

Resolution: Add STATUS type to message() calls so they can be suppressed
with CMake's --log-level option.
This commit is contained in:
Justin Graham
2025-12-10 06:54:23 -08:00
parent 5fa73e23be
commit 7607185e26
1 changed files with 16 additions and 10 deletions
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26
CMakeLists.txt
View File

@@ -17,17 +17,23 @@ else()
message(STATUS "Build type is '${CMAKE_BUILD_TYPE}'")
endif()
include(CheckCSourceCompiles)
check_c_source_compiles(
"#if defined(__EMSCRIPTEN__)
int main() {return 0;}
#endif"
BROTLI_EMSCRIPTEN
)
if (BROTLI_EMSCRIPTEN)
message("-- Compiler is EMSCRIPTEN")
# Detect Emscripten compiler.
# The EMSCRIPTEN variable is set by Emscripten's CMake toolchain file and is
# the recommended way to detect Emscripten builds.
#
# Note: Previously this used check_c_source_compiles() to test for the
# __EMSCRIPTEN__ macro, but that approach is unreliable in cross-compilation
# scenarios where CMake links a static library instead of an executable,
# causing false positives for non-Emscripten WASM toolchains (e.g., WASI SDK).
if (EMSCRIPTEN)
set(BROTLI_EMSCRIPTEN TRUE)
else()
message("-- Compiler is not EMSCRIPTEN")
set(BROTLI_EMSCRIPTEN FALSE)
endif()
if (BROTLI_EMSCRIPTEN)
message(STATUS "Compiler is EMSCRIPTEN")
else()
message(STATUS "Compiler is not EMSCRIPTEN")
endif()
if (BROTLI_EMSCRIPTEN)