fix build with gcc 10 Define __Cc, __Dc and Res_bit as extern to avoid the following build failure with gcc 10 (which defaults to -fno-common): /nvme/rc-buildroot-test/scripts/instance-0/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/10.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: CMakeFiles/mpcdec_shared.dir/requant.o:(.rodata+0x0): multiple definition of `__Dc'; CMakeFiles/mpcdec_shared.dir/mpc_decoder.o:(.rodata+0x430): first defined here /nvme/rc-buildroot-test/scripts/instance-0/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/10.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: CMakeFiles/mpcdec_shared.dir/requant.o:(.rodata+0x28): multiple definition of `__Cc'; CMakeFiles/mpcdec_shared.dir/mpc_decoder.o:(.rodata+0x458): first defined here /nvme/rc-buildroot-test/scripts/instance-0/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/10.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: CMakeFiles/mpcdec_shared.dir/requant.o:(.rodata+0x74): multiple definition of `Res_bit'; CMakeFiles/mpcdec_shared.dir/mpc_decoder.o:(.rodata+0x4a4): first defined here Fixes: - http://autobuild.buildroot.org/results/9971da8c59484a6a26eb79d6e157461a47855dbf Signed-off-by: Fabrice Fontaine diff -Naur musepack_src_r475.orig/libmpcdec/requant.h musepack_src_r475/libmpcdec/requant.h --- musepack_src_r475.orig/libmpcdec/requant.h 2020-09-10 08:31:50.696105246 +0200 +++ musepack_src_r475/libmpcdec/requant.h 2020-09-10 08:32:52.944106476 +0200 @@ -47,9 +47,9 @@ /* C O N S T A N T S */ -const mpc_uint8_t Res_bit [18]; ///< Bits per sample for chosen quantizer -const MPC_SAMPLE_FORMAT __Cc [1 + 18]; ///< Requantization coefficients -const mpc_int16_t __Dc [1 + 18]; ///< Requantization offset +extern const mpc_uint8_t Res_bit [18]; ///< Bits per sample for chosen quantizer +extern const MPC_SAMPLE_FORMAT __Cc [1 + 18]; ///< Requantization coefficients +extern const mpc_int16_t __Dc [1 + 18]; ///< Requantization offset #define Cc (__Cc + 1) #define Dc (__Dc + 1)