Prefer libiconv for iconv (#44335)
`glibc` and `musl` provide a basic implementation of `iconv` (`iconv`, `iconv_open`, `iconv_close`), but in practice the installation may be missing the character encoding methods to make them usable. On Fedora for example, users need to ```yum install glibc-gconv-extra``` to get the character encodings that `gettext` requires during configure, namely EUC-JP. Users may not have permissions to install the missing parts of glibc. Since Spack can install `libiconv`, it is simpler to use that by default.
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# -------------------------------------------------------------------------
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# This file controls default concretization preferences for Spack.
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#
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# Settings here are versioned with Spack and are intended to provide
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# sensible defaults out of the box. Spack maintainers should edit this
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# file to keep it current.
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#
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# Users can override these settings by editing the following files.
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#
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# Per-spack-instance settings (overrides defaults):
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# $SPACK_ROOT/etc/spack/packages.yaml
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#
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# Per-user settings (overrides default and site settings):
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# ~/.spack/packages.yaml
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# -------------------------------------------------------------------------
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packages:
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all:
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providers:
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iconv: [glibc, musl, libiconv]
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# -------------------------------------------------------------------------
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# This file controls default concretization preferences for Spack.
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#
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# Settings here are versioned with Spack and are intended to provide
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# sensible defaults out of the box. Spack maintainers should edit this
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# file to keep it current.
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#
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# Users can override these settings by editing the following files.
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#
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# Per-spack-instance settings (overrides defaults):
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# $SPACK_ROOT/etc/spack/packages.yaml
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#
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# Per-user settings (overrides default and site settings):
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# ~/.spack/packages.yaml
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# -------------------------------------------------------------------------
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packages:
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all:
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providers:
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iconv: [glibc, musl, libiconv]
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