Fixes mpaland#76: Now preventing clang and gcc from replacing our ali…

…ased functions with strength-reduced actual standard library functions.
qmk · Feb 21, 2022 · 5b1a3de · 5b1a3de
1 parent 957cedd
commit 5b1a3de
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -93,6 +93,12 @@ if (CMAKE_C_COMPILER_ID STREQUAL "MSVC")
 elseif (CMAKE_C_COMPILER_ID STREQUAL "GNU" OR
         CMAKE_C_COMPILER_ID STREQUAL "Clang")
 	target_compile_options(printf PRIVATE -Wall -Wextra -pedantic -Wconversion)
+	if (ALIAS_STANDARD_FUNCTION_NAMES)
+		# This is important for preventing our aliased implementation
+		# from being replaced, e.g. printf("%c", 'a') by putchar('a');
+		# clang and GCC apparently do this as an optimization
+		target_compile_options(printf PUBLIC -fno-builtin-printf)
+	endif()
 endif()
 
 if (BUILD_TESTS)