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long double phi = ...;
printf( "phi %20.14Le\n", phi);
results in this warning
unknown conversion type character 'L' in format [-Wformat=]
when compiling with MinGW-gcc 8.2.0, -C99.
From https://en.cppreference.com/w/cpp/io/c/fprintf
I understand that the length modifier 'L' is standard
(even pre 99), and that it is compatible with 'e'.
No warning when compiling the same code with gcc under Linux.
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