Noob question: Compiling issues - missing strtod_l and locale_t

[AlbertoEAF]

Hello,

I used fmt to replace numeric->string conversions in LightGBM microsoft/LightGBM#3405 and whilst in many environments it compiles and works very fast, there are some systems where it doesn't compile. I don't understand why. CMakeLists claims strtod_l was found:

-- Looking for strtod_l - found
-- Configuring done

but then the compilation fails. See lines 704 and 708 for instance: https://travis-ci.org/github/microsoft/LightGBM/jobs/730024056

Any ideas of what's the cause?

I believe it's something really basic and stupid from my part but don't know what I'm missing.

Thank you!

P.S.: This library is awesome - easy, featureful and FAST!! Thank you for that!

[vitaut]

fast_double_parser.h is not a part of {fmt}. Here's the detection code in case you want to replicate it in your project:

fmt/CMakeLists.txt

Lines 165 to 175 in 34179b3

	set(strtod_l_headers stdlib.h)
	if (APPLE)
	set(strtod_l_headers ${strtod_l_headers} xlocale.h)
	endif ()
	include(CheckSymbolExists)
	if (WIN32)
	check_symbol_exists(_strtod_l "${strtod_l_headers}" HAVE_STRTOD_L)
	else ()
	check_symbol_exists(strtod_l "${strtod_l_headers}" HAVE_STRTOD_L)
	endif ()

[AlbertoEAF]

Thank you, my bad!