Update autoconf m4 components

FFTW / fftw3

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Update autoconf m4 components #326

Closed sevan closed 7 months ago

sevan commented 1 year ago

Switch from AX_CHECK_COMPILER_FLAGS to AX_CHECK_COMPILE_FLAG & AX_CHECK_LINK_FLAG from autoconf-archive to resolve build issues with legacy Darwin. Syntax has been updated to autoconf 2.69 format, this paves the way for updating to 2.71, but that needs to be handled separately as the remaining files in m4 need updating to current autoconf-archive versions, as well as changes to configure.ac.

Resolves issue #193

sevan commented 7 months ago

@stevengj is there any issues with this proposed change?

stevengj commented 7 months ago

LGTM

sevan commented 7 months ago

Thanks :)