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diff --git a/build/moz.configure/lto-pgo.configure b/build/moz.configure/lto-pgo.configure
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--- a/build/moz.configure/lto-pgo.configure
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+++ b/build/moz.configure/lto-pgo.configure
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@@ -224,17 +224,20 @@ def lto(value, c_compiler, ld64_known_go
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#
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# https://github.com/llvm/llvm-project/blob/e7694f34ab6a12b8bb480cbfcb396d0a64fe965f/llvm/lib/Target/X86/X86.td#L1165-L1187
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if target.cpu == 'x86_64':
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ldflags.append('-mllvm:-mcpu=x86-64')
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# We do not need special flags for arm64. Hooray for fixed-length
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# instruction sets.
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else:
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num_cores = multiprocessing.cpu_count()
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- cflags.append("-flto")
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+ if len(value) and value[0].lower() == 'full':
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+ cflags.append("-flto")
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+ else:
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+ cflags.append("-flto=thin")
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cflags.append("-flifetime-dse=1")
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ldflags.append("-flto=%s" % num_cores)
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ldflags.append("-flifetime-dse=1")
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# Tell LTO not to inline functions above a certain size, to mitigate
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# binary size growth while still getting good performance.
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# (For hot functions, PGO will put a multiplier on this limit.)
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