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POc - Linker error building OpenWrt package
 

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  1. POc - Linker error building OpenWrt package
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    <p>I'm building a little OpenWRT application and I want to statically link a library to it.</p> <p><strong>EDIT</strong>: This happens with other libraries as well, not only libcurl.</p> <p>I'm getting this error while building it:</p> <pre><code>make[3]: Entering directory `/home/md/work/openwrt/build_dir/target-mips_r2_uClibc-0.9.33.2/app' mips-openwrt-linux-uclibc-gcc -c -Os -pipe -mips32r2 -mtune=34kc -mno-branch-likely -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -msoft-float -Wall -Werror main.c -o main.o mips-openwrt-linux-uclibc-gcc -Os -pipe -mips32r2 -mtune=34kc -mno-branch-likely -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -msoft-float -Wall -Werror -L/home/md/work/openwrt/staging_dir/target-mips_r2_uClibc-0.9.33.2/usr/lib -L/home/md/work/openwrt/staging_dir/target-mips_r2_uClibc-0.9.33.2/lib -L/home/md/work/openwrt/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/usr/lib -L/home/md/work/openwrt/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib -Wl,-Bstatic -lcurl main.o -o app /home/md/work/openwrt/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib/gcc/mips-openwrt-linux-uclibc/4.6.4/../../../../mips-openwrt-linux-uclibc/bin/ld: cannot find -lgcc_s /home/md/work/openwrt/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib/gcc/mips-openwrt-linux-uclibc/4.6.4/../../../../mips-openwrt-linux-uclibc/bin/ld: cannot find -lgcc_s collect2: ld returned 1 exit status make[3]: *** [app] Error 1 </code></pre> <p>It's weird, because I have libgcc_s.so on the search path:</p> <pre><code>stormbreaker:openwrt&gt; find . -name libgcc_s.* ./build_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/uClibc-0.9.33.2/libc/sysdeps/linux/common/libgcc_s.h ./build_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/gcc-linaro-4.6-2012.12-final/gcc/libgcc_s.so ./build_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/gcc-linaro-4.6-2012.12-final/gcc/libgcc_s.so.1 ./build_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/gcc-linaro-4.6-2012.12-final/mips-openwrt-linux-uclibc/libgcc/libgcc_s.so ./build_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/gcc-linaro-4.6-2012.12-final/mips-openwrt-linux-uclibc/libgcc/libgcc_s.so.1 ./build_dir/target-mips_r2_uClibc-0.9.33.2/toolchain/ipkg-ar71xx/libgcc/lib/libgcc_s.so.1 ./build_dir/target-mips_r2_uClibc-0.9.33.2/toolchain/libgcc_s.so.1 ./staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib/libgcc_s.so ./staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/lib/libgcc_s.so.1 ./staging_dir/target-mips_r2_uClibc-0.9.33.2/root-ar71xx/lib/libgcc_s.so ./staging_dir/target-mips_r2_uClibc-0.9.33.2/root-ar71xx/lib/libgcc_s.so.1 </code></pre> <p>I tried some hacks with -rpath and -rpath-link, but got the same result. As far as I know, libcurl doesn't need libgcc_s.</p> <p>I created a simple case to reproduce this:</p> <p>The relevant part of <code>openwrt/package/app/Makefile</code>:</p> <pre><code>TARGET_CFLAGS += -Wall -Werror TARGET_LIBS = -Wl,-Bstatic -lcurl define Build/Compile CC="$(TARGET_CC)" \ CFLAGS="$(TARGET_CFLAGS)" \ LDFLAGS="$(TARGET_LDFLAGS)" \ LIBS="$(TARGET_LIBS)" \ $(MAKE) -C $(PKG_BUILD_DIR) endef </code></pre> <p><code>openwrt/package/app/src/Makefile</code>:</p> <pre><code>APP = app SOURCES = $(wildcard *.c) OBJECTS = $(SOURCES:.c=.o) $(APP): $(OBJECTS) $(CC) $(CFLAGS) $(LDFLAGS) $(LIBS) $(OBJECTS) -o $(APP) # Objects %.o: %.c $(CC) -c $(CFLAGS) $&lt; -o $@ </code></pre> <p>The application itself is a single file:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;curl/curl.h&gt; int main (void) { curl_global_init(CURL_GLOBAL_ALL); printf("Ok!\n"); return 0; } </code></pre>
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