[openwrt/openwrt] tools: zstd: override max safe compression level

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/ed149717eec3bfe42d4cc32ee1d74cc53a19bad5

commit ed149717eec3bfe42d4cc32ee1d74cc53a19bad5
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Fri Apr 5 14:29:50 2024 +0200

    tools: zstd: override max safe compression level
    
    ZTSD limits the safe compression level to a max of 19 as 20 to 22 cause
    increased RAM usage. Higher levels require --ultra arg passed.
    
    There isn't currently a way to set --ultra using ENV options similar to
    ZSTD_CLEVEL and ZSTD_CLEVEL is limited to 19.
    
    To fix this, we can increase the max safe compression level by providing
    a custom ZSTDCLI_CLEVEL_MAX value with CFLAGS.
    
    The max safe level is increased to 20.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 tools/zstd/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/zstd/Makefile b/tools/zstd/Makefile
index 3f69c6d497..d194ecd005 100644
--- a/tools/zstd/Makefile
+++ b/tools/zstd/Makefile
@@ -17,6 +17,9 @@ include $(INCLUDE_DIR)/host-build.mk
 
 HOSTCC:= $(HOSTCC_NOCACHE)
 
+HOST_CFLAGS += \
+	-DZSTDCLI_CLEVEL_MAX=20
+
 HOST_MAKE_FLAGS += \
 	ZSTD_LEGACY_SUPPORT=7 \
 	BACKTRACE=0 \