构建依赖zlib与SQLite的Rcpp包时，Makevars.win中LDFLAGS未生效导致链接错误的求助

Let's break down your issue and fix it step by step. The root problem here is that while you've enabled stack protection with -fstack-protector in your compile flags, the linker isn't receiving this flag (or the required support library), so it can't find the __stack_chk_fail symbol the compiler inserted into your code.

Here are three reliable solutions to resolve this:

Solution 1: Ensure -fstack-protector is present in both compile and link flags #

Stack protection requires the flag to be set during both compilation (to insert safety checks) and linking (to pull in the supporting library). Update your Makevars.win to add -fstack-protector to all relevant sections:

PKG_CPPFLAGS=-I. -I./lib/sqlite/ -fopenmp -march=native -g -O2 -msse2 -mfpmath=sse\
 -DRSQLITE_USE_BUNDLED_SQLITE \
 -DSQLITE_ENABLE_RTREE \
 -DSQLITE_ENABLE_FTS3 \
 -DSQLITE_ENABLE_FTS3_PARENTHESIS \
 -DSQLITE_ENABLE_FTS5 \
 -DSQLITE_ENABLE_JSON1 \
 -DSQLITE_ENABLE_STAT4 \
 -DSQLITE_SOUNDEX \
 -DRCPP_DEFAULT_INCLUDE_CALL=false \
 -DRCPP_USING_UTF8_ERROR_STRING \
 -DBOOST_NO_AUTO_PTR \
 -DSQLITE_MAX_LENGTH=2147483647 \
 -DHAVE_USLEEP=1
# Add -fstack-protector to compile flags for C and C++
PKG_CXXFLAGS=$(CXX_VISIBILITY) -fstack-protector
PKG_CFLAGS=$(C_VISIBILITY) -fstack-protector
# Include it in linker flags
LDFLAGS=-fstack-protector
# Add it to PKG_LIBS to ensure it's passed to the final link command
PKG_LIBS = -fstack-protector lib/sqlite/sqlite3.o lib/zlib/adler32.o lib/zlib/compress.o lib/zlib/crc32.o lib/zlib/deflate.o lib/zlib/gzclose.o lib/zlib/gzlib.o lib/zlib/gzread.o lib/zlib/gzwrite.o lib/zlib/infback.o lib/zlib/inffast.o lib/zlib/inflate.o lib/zlib/inftrees.o lib/zlib/trees.o lib/zlib/uncompr.o lib/zlib/zutil.o
.PHONY: all
all: $(SHLIB)
$(SHLIB): $(PKG_LIBS)

This ensures the flag is present at every stage of the build process, so the linker knows to include the stack protection support code.

Solution 2: Explicitly link the libssp library #

The __stack_chk_fail symbol is provided by the libssp (stack-smashing protector) library. Instead of relying on -fstack-protector to pull it in automatically, you can explicitly add -lssp to your PKG_LIBS:

PKG_LIBS = lib/sqlite/sqlite3.o lib/zlib/adler32.o lib/zlib/compress.o lib/zlib/crc32.o lib/zlib/deflate.o lib/zlib/gzclose.o lib/zlib/gzlib.o lib/zlib/gzread.o lib/zlib/gzwrite.o lib/zlib/infback.o lib/zlib/inffast.o lib/zlib/inflate.o lib/zlib/inftrees.o lib/zlib/trees.o lib/zlib/uncompr.o lib/zlib/zutil.o -lssp

This directly tells the linker to link against libssp, which resolves the missing symbol error immediately. This is often the most straightforward fix for MinGW-based toolchains like Rtools40.

Solution 3: Use -fstack-protector-all for broader coverage #

If you want stack protection enabled for all functions (not just those with vulnerable buffer types), replace -fstack-protector with -fstack-protector-all in your compile and link flags. This ensures maximum protection and often helps the linker correctly locate the support library:

PKG_CXXFLAGS=$(CXX_VISIBILITY) -fstack-protector-all
PKG_CFLAGS=$(C_VISIBILITY) -fstack-protector-all
LDFLAGS=-fstack-protector-all
PKG_LIBS = -fstack-protector-all lib/sqlite/sqlite3.o lib/zlib/adler32.o lib/zlib/compress.o lib/zlib/crc32.o lib/zlib/deflate.o lib/zlib/gzclose.o lib/zlib/gzlib.o lib/zlib/gzread.o lib/zlib/gzwrite.o lib/zlib/infback.o lib/zlib/inffast.o lib/zlib/inflate.o lib/zlib/inftrees.o lib/zlib/trees.o lib/zlib/uncompr.o lib/zlib/zutil.o

Verification #

After applying any of these fixes, check your link command again. You should see either -fstack-protector (or -fstack-protector-all) or -lssp in the command line, which will resolve the undefined reference to __stack_chk_fail errors.

内容的提问来源于stack exchange，提问作者Joseph O'Brien