96aca7c517
Non-LTO compiles set the buffer name to "<inline asm>"
(`AsmPrinter::addInlineAsmDiagBuffer`) and pass diagnostics to
`ClangDiagnosticHandler` (through the `MCContext` handler in
`MachineModuleInfoWrapperPass::doInitialization`) to ensure that
the exit code is 1 in the presence of errors. In contrast, LTO compiles
spuriously succeed even if error messages are printed.
```
% cat a.c
void _start() {}
asm("unknown instruction");
% clang -c a.c
<inline asm>:1:1: error: invalid instruction mnemonic 'unknown'
1 | unknown instruction
| ^
1 error generated.
% clang -c -flto a.c; echo $? # -flto=thin is the same
error: invalid instruction mnemonic 'unknown'
unknown instruction
^~~~~~~
error: invalid instruction mnemonic 'unknown'
unknown instruction
^~~~~~~
0
```
`CollectAsmSymbols` parses inline assembly and is transitively called by
both `ModuleSummaryIndexAnalysis::run` and `WriteBitcodeToFile`, leading
to duplicate diagnostics.
This patch updates `CollectAsmSymbols` to be similar to non-LTO
compiles.
```
% clang -c -flto=thin a.c; echo $?
<inline asm>:1:1: error: invalid instruction mnemonic 'unknown'
1 | unknown instruction
| ^
1 errors generated.
1
```
The `HasErrors` check does not prevent duplicate warnings but assembler
warnings are very uncommon.
11 lines
595 B
C
11 lines
595 B
C
// REQUIRES: arm-registered-target
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// RUN: not %clang_cc1 -emit-obj -triple armv6-unknown-unknown -o %t %s 2>&1 | FileCheck %s
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// RUN: not %clang_cc1 -emit-obj -triple armv6-unknown-unknown -flto -o %t %s 2>&1 | FileCheck %s
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/// Test the diagnostic behavior considering the whole system including the driver.
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// RUN: not %clang --target=armv6-unknown-unknown -c -flto=thin -o %t %s 2>&1 | FileCheck %s
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#pragma clang diagnostic ignored "-Wmissing-noreturn"
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__asm__(".Lfoo: movw r2, #:lower16:.Lbar - .Lfoo");
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// CHECK: <inline asm>:1:8: error: instruction requires: armv6t2
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// CHECK-NOT: error:
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