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Commit7a7f13a

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meson: Tie adding C++ support to the llvm Meson option
In the event the llvm option is defined to be 'auto', it is possiblethat the host machine might not have a C++ compiler. If that is thecase, then we shouldn't continue reaching for the llvm dependency.To make it easier to understand the case where LLVM support is disabled due tolacking a C++ compiler, add a message noting that fact.Author: Tristan Partin <tristan@neon.tech>Reviewed-by: Andres Freund <andres@anarazel.de>Discussion:https://postgr.es/m/CSPIJVUDZFKX.3KHMOAVGF94RV@c3poBackpatch: 16-, where meson support was added
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‎meson.build

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@@ -746,8 +746,8 @@ endif
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###############################################################
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llvmopt=get_option('llvm')
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ifnot llvmopt.disabled()
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add_languages('cpp',required:true,native:false)
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llvm= not_found_dep
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ifadd_languages('cpp',required:llvmopt,native:false)
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llvm=dependency('llvm',version:'>=3.9',method:'config-tool',required: llvmopt)
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if llvm.found()
@@ -761,8 +761,8 @@ if not llvmopt.disabled()
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ccache=find_program('ccache',native:true,required:false)
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clang=find_program(llvm_binpath/'clang',required:true)
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endif
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else
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llvm= not_found_dep
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elif llvmopt.auto()
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message('llvmrequires a C++ compiler')
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endif
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