logging: Add option to remove strings from binary

Add option to remove string literals which are constant and never touched by the firmware. It can save significant amount of RO memory. Signed-off-by: Krzysztof Chruściński <[email protected]>
zephyrproject-rtos · Oct 27, 2023 · 59abf92 · 59abf92
1 parent f172a1a
commit 59abf92
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diff --git a/include/zephyr/linker/common-rom/common-rom-logging.ld b/include/zephyr/linker/common-rom/common-rom-logging.ld
@@ -2,7 +2,14 @@
 
 #include <zephyr/linker/iterable_sections.h>
 
+#ifdef CONFIG_LOG_FMT_SECTION_STRIP
+	SECTION_PROLOGUE(log_strings,(COPY),SUBALIGN(4))
+	{
+		Z_LINK_ITERABLE(log_strings);
+	} GROUP_ROM_LINK_IN(DEVNULL_REGION, DEVNULL_REGION)
+#else
 	ITERABLE_SECTION_ROM(log_strings, 4)
+#endif
 
 	ITERABLE_SECTION_ROM(log_const, 4)
 

diff --git a/subsys/logging/Kconfig.misc b/subsys/logging/Kconfig.misc
@@ -65,6 +65,13 @@ config LOG_FMT_SECTION
 	  removing strings from final binary and should be used for dictionary
 	  logging.
 
+config LOG_FMT_SECTION_STRIP
+	bool "Strip log strings from binary"
+	depends on !LOG_OUTPUT
+	depends on LOG_FMT_SECTION
+	depends on LINKER_DEVNULL_SUPPORT
+	imply LINKER_DEVNULL_MEMORY
+
 config LOG_USE_TAGGED_ARGUMENTS
 	bool "Using tagged arguments for packaging"
 	depends on !PICOLIBC