libc: minimal: Add "prohibit_lto" flag to avoid problems with LTO

The compiler requires that much of the C library be built without using LTO
so that various symbols are available for use by generated code, including
things like memset and memcpy.

Add the "prohibit_lto" CMake target compiler property to avoid LTO when
activated.

Signed-off-by: Matthias Plöger <[email protected]>

Author: embRoobin

lib/libc/minimal/CMakeLists.txt

@@ -12,6 +12,7 @@ set(GEN_DIR ${ZEPHYR_BINARY_DIR}/include/generated)
 set(STRERROR_TABLE_H ${GEN_DIR}/libc/minimal/strerror_table.h)
 
 zephyr_library_compile_options($<TARGET_PROPERTY:compiler,no_builtin>)
+zephyr_library_compile_options($<TARGET_PROPERTY:compiler,prohibit_lto>)
 
 zephyr_library_sources(
   source/stdlib/atoi.c