I am using the 4.7.3-201301 toolchain and when trying to compile an android kernel I get the following exidx warnings:

/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 20 of arch/arm/common/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 11 of arch/arm/crypto/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 52 of arch/arm/mach-msm/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 598 of kernel/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 263 of mm/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 116 of fs/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 37 of crypto/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 203 of block/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 153 of lib/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 39 of drivers/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 11 of sound/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 9 of arch/arm/oprofile/built-in.o is not in EXIDX output section
/home/ggutierrez/android-toolchain-eabi-4.7.3-201301/bin/arm-eabi-ld: warning: unwinding may not work because EXIDX input section 506 of net/built-in.o is not in EXIDX output section