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meson: stop setting -fPIE globally
Setting -fPIE globally can lead to miscompilations on certain architectures. This is caused by both -fPIE and -fPIC options being added to various compilation commands. Only -fPIC is being recorded in the LTO options section of the object. The gcc-8 LTO plugin merges -fPIC + -fPIE to nothing. So, the compilations done by the plugin are not position-independent and fail to link with -pie. The simplest solution is to stop setting -fPIE globally and instead using meson's b_pie=true option. This requires meson 0.49 or later. Since we don't set this option in meson.build but leave it up to the distro maintainer to set this option, do not bump the meson version requirement. Fixes: #10548
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@ -359,13 +359,6 @@ possible_link_flags = [
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'-Wl,-z,now',
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]
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# the oss-fuzz fuzzers are not built with -fPIE, so don't
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# enable it when we are linking against them
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if not fuzzer_build
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possible_cc_flags += '-fPIE'
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possible_link_flags += '-pie'
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endif
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if cc.get_id() == 'clang'
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possible_cc_flags += [
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'-Wno-typedef-redefinition',
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