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Fixes numerous warnings with --enable-small or --disable-optimizations.

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Patch by Georgi Chorbadzhiyski gf at unixsol dor org


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This makes it an error to not have a prototype in scope for
a function with external linkage.  The flag is only enabled
for gcc due to -Werror=type not working with all compilers.

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Some other compilers turn too many warnings into errors with this flag.

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Older versions accepted both with and without an '=', but newer versions
require the '=' to be omitted

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Turning on -Werror=implicit makes implicit function declarations
an error with supported compilers.

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This reverts r21884.  Apparently people want those warnings.

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Spotted by Ramiro.

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GCC is sometimes able to optimise constant calls to these functions,
incorrectly indicating that they exist.  Unoptimised calls will then
fail to link.

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These are often, contrary to standards, implemented only as macros
or compiler-builtin functions without an actual symbol definition.

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Approved by Diego at FOSDEM.



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Some SoCs have a small amount of on-chip SRAM which may be used
for frequently used code or data.  When enabled, this option
will allow FFmpeg to use such facilities where supported.

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