1 files changed, 55 insertions, 0 deletions
diff --git a/lld/test/ELF/lto/thinlto_emit_imports.ll b/lld/test/ELF/lto/thinlto_emit_imports.ll
new file mode 100644
index 00000000000..465e0b686c9
--- /dev/null
+++ b/lld/test/ELF/lto/thinlto_emit_imports.ll
@@ -0,0 +1,55 @@
+; REQUIRES: x86
+
+; Generate summary sections and test lld handling.
+; RUN: opt -module-summary %s -o %t.o
+; RUN: opt -module-summary %p/Inputs/thinlto.ll -o %t2.o
+
+; Include a file with an empty module summary index, to ensure that the expected
+; output files are created regardless, for a distributed build system.
+; RUN: opt -module-summary %p/Inputs/thinlto_empty.ll -o %t3.o
+
+; Ensure lld generates imports files if requested for distributed backends.
+; RUN: rm -f %t3.o.imports %t3.o.thinlto.bc
+; RUN: ld.lld --plugin-opt=thinlto-index-only --plugin-opt=thinlto-emit-imports-files -shared %t.o %t2.o %t3.o -o %t4
+
+; The imports file for this module contains the bitcode file for
+; Inputs/thinlto.ll
+; RUN: cat %t.o.imports | count 1
+; RUN: cat %t.o.imports | FileCheck %s --check-prefix=IMPORTS1
+; IMPORTS1: thinlto_emit_imports.ll.tmp2.o
+
+; The imports file for Input/thinlto.ll is empty as it does not import anything.
+; RUN: cat %t2.o.imports | count 0
+
+; The imports file for Input/thinlto_empty.ll is empty but should exist.
+; RUN: cat %t3.o.imports | count 0
+
+; The index file should be created even for the input with an empty summary.
+; RUN: ls %t3.o.thinlto.bc
+
+; Ensure lld generates error if unable to write to imports file.
+; RUN: rm -f %t3.o.imports
+; RUN: touch %t3.o.imports
+; RUN: chmod 400 %t3.o.imports
+; RUN: not ld.lld -m elf_x86_64 --plugin-opt=thinlto-index-only --plugin-opt=thinlto-emit-imports-files -shared %t.o %t2.o %t3.o -o %t4 2>&1 | FileCheck %s --check-prefix=ERR
+; ERR: cannot open {{.*}}3.o.imports: {{P|p}}ermission denied
+
+; Ensure lld doesn't generate import files when thinlto-index-only is not enabled
+; RUN: rm -f %t.o.imports
+; RUN: rm -f %t2.o.imports
+; RUN: rm -f %t3.o.imports
+; RUN: ld.lld -m elf_x86_64 --plugin-opt=thinlto-emit-imports-files -shared %t.o %t2.o %t3.o -o %t4
+; RUN: not ls %t.o.imports
+; RUN: not ls %t2.o.imports
+; RUN: not ls %t4.o.imports
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare void @g(...)
+
+define void @f() {
+entry:
+  call void (...) @g()
+  ret void
+}