[openwrt/openwrt] tools/zstd: enable position independent code compilation

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/98cc65d9a0c4e7beb4b9a8f8482ab8908435290b

commit 98cc65d9a0c4e7beb4b9a8f8482ab8908435290b
Author: Bryan Roessler <bryanroessler at gmail.com>
AuthorDate: Tue Apr 23 21:37:25 2024 -0400

    tools/zstd: enable position independent code compilation
    
    Currently, trying to compile LLVM-BPF will fail with:
    [2225/3517] Linking CXX shared library lib/libLLVM-15.so
    FAILED: lib/libLLVM-15.so
    /usr/bin/ld: staging_dir/host/lib/libzstd.a(zstd_common.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
    /usr/bin/ld: failed to set dynamic section sizes: bad value
    collect2: error: ld returned 1 exit status
    
    So, to fix it enable PIC for the host ZSTD.
    
    Fixes: #15247
    Signed-off-by: Bryan Roessler <bryanroessler at gmail.com>
---
 tools/zstd/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/zstd/Makefile b/tools/zstd/Makefile
index f962809f82..e1d36c59cf 100644
--- a/tools/zstd/Makefile
+++ b/tools/zstd/Makefile
@@ -17,6 +17,8 @@ include $(INCLUDE_DIR)/host-build.mk
 
 HOSTCC:= $(HOSTCC_NOCACHE)
 
+HOST_CFLAGS += $(HOST_FPIC)
+
 HOST_MAKE_FLAGS += \
 	BACKTRACE=0 \
 	HAVE_THREAD=1 \