docs: remove --disable-stage1-checking from requirements
As the minimal GCC version that can build the current master is 4.8, it does not make sense mentioning something for older versions. gcc/ChangeLog: * doc/install.texi: Remove option for GCC < 4.8.
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@ -239,11 +239,6 @@ To build all languages in a cross-compiler or other configuration where
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GCC binary (version 4.8 or later) because source code for language
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frontends other than C might use GCC extensions.
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Note that to bootstrap GCC with versions of GCC earlier than 4.8, you
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may need to use @option{--disable-stage1-checking}, though
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bootstrapping the compiler with such earlier compilers is strongly
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discouraged.
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@item C standard library and headers
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In order to build GCC, the C standard library and headers must be present
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