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Build failure due to implicit declaration of functions #31

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@ryandesign

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@ryandesign

scalapack 2.1.0 fails to build when implicit declaration of functions is an error. (This is the default behavior of the clang included with Apple's Xcode 12 or later and can also be achieved on other compilers by adding -Werror=implicit-function-declaration to CFLAGS.) grepping the build log for these errors, they are:

BLACS/SRC/igsum2d_.c:153:7: error: implicit declaration of function 'BI_imvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/igsum2d_.c:166:6: error: implicit declaration of function 'BI_ivmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/sgsum2d_.c:154:7: error: implicit declaration of function 'BI_smvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/sgsum2d_.c:167:6: error: implicit declaration of function 'BI_svmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/dgsum2d_.c:154:7: error: implicit declaration of function 'BI_dmvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/dgsum2d_.c:167:6: error: implicit declaration of function 'BI_dvmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/cgsum2d_.c:154:7: error: implicit declaration of function 'BI_smvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/cgsum2d_.c:169:6: error: implicit declaration of function 'BI_svmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/zgsum2d_.c:156:7: error: implicit declaration of function 'BI_dmvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/zgsum2d_.c:171:6: error: implicit declaration of function 'BI_dvmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/igamx2d_.c:199:7: error: implicit declaration of function 'BI_imvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/igamx2d_.c:278:6: error: implicit declaration of function 'BI_ivmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/igamx2d_.c:280:16: error: implicit declaration of function 'BI_TransDist' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/sgamx2d_.c:202:7: error: implicit declaration of function 'BI_smvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/sgamx2d_.c:281:6: error: implicit declaration of function 'BI_svmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/sgamx2d_.c:283:16: error: implicit declaration of function 'BI_TransDist' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/dgamx2d_.c:202:7: error: implicit declaration of function 'BI_dmvcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/dgamx2d_.c:281:6: error: implicit declaration of function 'BI_dvmcopy' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
BLACS/SRC/dgamx2d_.c:283:16: error: implicit declaration of function 'BI_TransDist' is invalid in C99 [-Werror,-Wimplicit-function-declaration]

This was reported to MacPorts here: https://trac.macports.org/ticket/62567

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