f811d7b509
This is the driver part of https://github.com/llvm/llvm-project/pull/75894. This patch introduces '-fexperimental-modules-reduced-bmi' to enable generating the reduced BMI. This patch did: - When `-fexperimental-modules-reduced-bmi` is specified but `--precompile` is not specified for a module unit, we'll skip the precompile phase to avoid unnecessary two-phase compilation phases. Then if `-c` is specified, we will generate the reduced BMI in CodeGenAction as a by-product. - When `-fexperimental-modules-reduced-bmi` is specified and `--precompile` is specified, we will generate the reduced BMI in GenerateModuleInterfaceAction as a by-product. - When `-fexperimental-modules-reduced-bmi` is specified for a non-module unit. We don't do anything nor try to give a warn. This is more user friendly so that the end users can try to test and experiment with the feature without asking help from the build systems. The core design idea is that users should be able to enable this easily with the existing cmake mechanisms. The future plan for the flag is: - Add this to clang19 and make it opt-in for 1~2 releases. It depends on the testing feedback to decide how long we like to make it opt-in. - Then we can announce the existing BMI generating may be deprecated and suggesting people (end users or build systems) to enable this for 1~2 releases. - Finally we will enable this by default. When that time comes, the term `BMI` will refer to the reduced BMI today and the existing BMI will only be meaningful to build systems which loves to support two phase compilations. I'll send release notes and document in seperate commits after this get landed.
52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
// It is annoying to handle different slash direction
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// in Windows and Linux. So we disable the test on Windows
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// here.
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// REQUIRES: !system-windows
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// On AIX, the default output for `-c` may be `.s` instead of `.o`,
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// which makes the test fail. So disable the test on AIX.
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// UNSUPPORTED: system-aix
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//
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// RUN: rm -rf %t && split-file %s %t && cd %t
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//
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// RUN: %clang -std=c++20 Hello.cppm -fmodule-output=Hello.pcm \
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// RUN: -fexperimental-modules-reduced-bmi -c -o Hello.o -### 2>&1 | FileCheck Hello.cppm
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//
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// RUN: %clang -std=c++20 Hello.cppm \
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// RUN: -fexperimental-modules-reduced-bmi -c -o Hello.o -### 2>&1 | \
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// RUN: FileCheck Hello.cppm --check-prefix=CHECK-UNSPECIFIED
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//
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// RUN: %clang -std=c++20 Hello.cppm \
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// RUN: -fexperimental-modules-reduced-bmi -c -### 2>&1 | \
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// RUN: FileCheck Hello.cppm --check-prefix=CHECK-NO-O
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//
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// RUN: %clang -std=c++20 Hello.cppm \
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// RUN: -fexperimental-modules-reduced-bmi -c -o AnotherName.o -### 2>&1 | \
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// RUN: FileCheck Hello.cppm --check-prefix=CHECK-ANOTHER-NAME
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//
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// RUN: %clang -std=c++20 Hello.cppm --precompile -fexperimental-modules-reduced-bmi \
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// RUN: -o Hello.full.pcm -### 2>&1 | FileCheck Hello.cppm \
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// RUN: --check-prefix=CHECK-EMIT-MODULE-INTERFACE
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//
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// RUN: %clang -std=c++20 Hello.cc -fexperimental-modules-reduced-bmi -Wall -Werror \
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// RUN: -c -o Hello.o -### 2>&1 | FileCheck Hello.cc
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//--- Hello.cppm
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export module Hello;
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// Test that we won't generate the emit-module-interface as 2 phase compilation model.
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// CHECK-NOT: -emit-module-interface
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// CHECK: "-fexperimental-modules-reduced-bmi"
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// CHECK-UNSPECIFIED: -fmodule-output=Hello.pcm
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// CHECK-NO-O: -fmodule-output=Hello.pcm
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// CHECK-ANOTHER-NAME: -fmodule-output=AnotherName.pcm
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// With `-emit-module-interface` specified, we should still see the `-emit-module-interface`
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// flag.
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// CHECK-EMIT-MODULE-INTERFACE: -emit-module-interface
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//--- Hello.cc
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// CHECK-NOT: "-fexperimental-modules-reduced-bmi"
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