fix build with gcc 10
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Define __Cc, __Dc and Res_bit as extern to avoid the following build
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failure with gcc 10 (which defaults to -fno-common):
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/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
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/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
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/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
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Fixes:
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- http://autobuild.buildroot.org/results/9971da8c59484a6a26eb79d6e157461a47855dbf
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Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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diff -Naur musepack_src_r475.orig/libmpcdec/requant.h musepack_src_r475/libmpcdec/requant.h
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--- musepack_src_r475.orig/libmpcdec/requant.h 2020-09-10 08:31:50.696105246 +0200
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+++ musepack_src_r475/libmpcdec/requant.h 2020-09-10 08:32:52.944106476 +0200
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@@ -47,9 +47,9 @@
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/* C O N S T A N T S */
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-const mpc_uint8_t Res_bit [18]; ///< Bits per sample for chosen quantizer
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-const MPC_SAMPLE_FORMAT __Cc [1 + 18]; ///< Requantization coefficients
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-const mpc_int16_t __Dc [1 + 18]; ///< Requantization offset
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+extern const mpc_uint8_t Res_bit [18]; ///< Bits per sample for chosen quantizer
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+extern const MPC_SAMPLE_FORMAT __Cc [1 + 18]; ///< Requantization coefficients
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+extern const mpc_int16_t __Dc [1 + 18]; ///< Requantization offset
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#define Cc (__Cc + 1)
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#define Dc (__Dc + 1)
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