I was trying to build cross gcc and libgcc based on gcc-4.8 for target i486 without floating point support. I build libgcc with option "-D_SOFT_FLOAT -march=i486 -msoft-float -mno-sse -Wa,-march=i486" but I met following errors: 1. compilation error in file "crtprec.c" : used inline assembly which contains float-point instruction ../../../gcc-4.8/libgcc/config/i386/crtprec.c: Assembler messages: ../../../gcc-4.8/libgcc/config/i386/crtprec.c:40: Error: `fstcw' is not supported on `i486' ../../../gcc-4.8/libgcc/config/i386/crtprec.c:45: Error: `fldcw' is not supported on `i486' 2. After I comment out the inline assembly to avoid error 1, I could get a libgcc for i486 version. There's some undefined soft-float function as the following. The source code of corresponding function are existed in libgcc but they aren't included in libgcc.a. out/target/product/obj/STATIC_LIBRARIES/libc_common_intermediates/libc_common.a(time.o): In function `clock_now': /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__floatsidf' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__floatsidf' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__muldf3' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__adddf3' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__fixdfsi' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__floatsidf' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__floatsidf' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__muldf3' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__adddf3' /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53: undefined reference to `__fixdfsi My gcc version is 4.8 and configuration is ============================================ ./gcc-4.8/configure --target=i486-linux-android --disable-multilib --disable-nls --disable-shared --disable-threads --enable-visibility --disable-decimal-float --disable-bootstrap --enable-languages=c,c++ ============================================ Could anybody shed some light on how to build libgcc for target i486 without floating point support? Thanks a lot. Best Regards, Reid
