a45f713c67
Add -fpch-instantiate-templates which makes template instantiations be performed already in the PCH instead of it being done in every single file that uses the PCH (but every single file will still do it as well in order to handle its own instantiations). I can see 20-30% build time saved with the few tests I've tried. The change may reorder compiler output and also generated code, but should be generally safe and produce functionally identical code. There are some rare cases that do not compile with it, such as test/PCH/pch-instantiate-templates-forward-decl.cpp. If template instantiation bailed out instead of reporting the error, these instantiations could even be postponed, which would make them work. Enable this by default for clang-cl. MSVC creates PCHs by compiling them using an empty .cpp file, which means templates are instantiated while building the PCH and so the .h needs to be self-contained, making test/PCH/pch-instantiate-templates-forward-decl.cpp to fail with MSVC anyway. So the option being enabled for clang-cl matches this. Differential Revision: https://reviews.llvm.org/D69585
176 lines
4.3 KiB
C++
176 lines
4.3 KiB
C++
// No PCH:
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// RUN: %clang_cc1 -pedantic -std=c++1y -include %s -include %s -verify %s -DNONPCH
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// RUN: %clang_cc1 -pedantic -std=c++1y -include %s -include %s -verify %s -DNONPCH -DERROR
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//
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// With PCH:
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// RUN: %clang_cc1 -pedantic -std=c++1y -emit-pch %s -o %t.a -DHEADER1
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// RUN: %clang_cc1 -pedantic -std=c++1y -include-pch %t.a -emit-pch %s -o %t.b -DHEADER2
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// RUN: %clang_cc1 -pedantic -std=c++1y -include-pch %t.b -verify %s -DHEADERUSE
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// RUN: %clang_cc1 -pedantic -std=c++1y -emit-pch -fpch-instantiate-templates %s -o %t.a -DHEADER1
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// RUN: %clang_cc1 -pedantic -std=c++1y -include-pch %t.a -emit-pch -fpch-instantiate-templates %s -o %t.b -DHEADER2
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// RUN: %clang_cc1 -pedantic -std=c++1y -include-pch %t.b -verify %s -DHEADERUSE
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#ifndef ERROR
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// expected-no-diagnostics
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#endif
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#ifdef NONPCH
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#if !defined(HEADER1)
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#define HEADER1
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#undef HEADER2
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#undef HEADERUSE
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#elif !defined(HEADER2)
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#define HEADER2
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#undef HEADERUSE
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#else
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#define HEADERUSE
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#undef HEADER1
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#undef HEADER2
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#endif
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#endif
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// *** HEADER1: First header file
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#if defined(HEADER1) && !defined(HEADER2) && !defined(HEADERUSE)
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template<typename T> T var0a = T();
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template<typename T> extern T var0b;
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namespace join {
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template<typename T> T va = T(100);
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template<typename T> extern T vb;
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namespace diff_types {
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#ifdef ERROR
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template<typename T> extern float err0;
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template<typename T> extern T err1;
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#endif
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template<typename T> extern T def;
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}
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}
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namespace spec {
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template<typename T> constexpr T va = T(10);
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template<> constexpr float va<float> = 1.5;
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template constexpr int va<int>;
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template<typename T> T vb = T();
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template<> constexpr float vb<float> = 1.5;
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template<typename T> T vc = T();
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template<typename T> constexpr T vd = T(10);
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template<typename T> T* vd<T*> = new T();
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}
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namespace spec_join1 {
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template<typename T> T va = T(10);
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template<> extern float va<float>;
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extern template int va<int>;
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template<typename T> T vb = T(10);
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template<> extern float vb<float>;
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template<typename T> T vc = T(10);
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template<typename T> T vd = T(10);
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template<typename T> extern T* vd<T*>;
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}
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#endif
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// *** HEADER2: Second header file -- including HEADER1
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#if defined(HEADER2) && !defined(HEADERUSE)
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namespace join {
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template<typename T> extern T va;
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template<> constexpr float va<float> = 2.5;
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template<typename T> T vb = T(100);
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namespace diff_types {
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#ifdef ERROR
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template<typename T> extern T err0; // expected-error {{redeclaration of 'err0' with a different type: 'T' vs 'float'}} // expected-note@46 {{previous declaration is here}}
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template<typename T> extern float err1; // expected-error {{redeclaration of 'err1' with a different type: 'float' vs 'T'}} // expected-note@47 {{previous declaration is here}}
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#endif
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template<typename T> extern T def;
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}
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}
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namespace spec_join1 {
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template<typename T> extern T va;
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template<> float va<float> = 1.5;
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extern template int va<int>;
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template<> float vb<float> = 1.5;
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template int vb<int>;
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template<> float vc<float> = 1.5;
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template int vc<int>;
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template<typename T> extern T vd;
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template<typename T> T* vd<T*> = new T();
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}
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#endif
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// *** HEADERUSE: File using both header files -- including HEADER2
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#ifdef HEADERUSE
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template int var0a<int>;
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float fvara = var0a<float>;
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template<typename T> extern T var0a;
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template<typename T> T var0b = T();
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template int var0b<int>;
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float fvarb = var0b<float>;
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namespace join {
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template const int va<const int>;
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template<> const int va<int> = 50;
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static_assert(va<float> == 2.5, "");
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static_assert(va<int> == 50, "");
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template<> constexpr float vb<float> = 2.5;
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template const int vb<const int>;
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static_assert(vb<float> == 2.5, "");
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static_assert(vb<const int> == 100, "");
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namespace diff_types {
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template<typename T> T def = T();
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}
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}
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namespace spec {
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static_assert(va<float> == 1.5, "");
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static_assert(va<int> == 10, "");
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template<typename T> T* vb<T*> = new T();
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int* intpb = vb<int*>;
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static_assert(vb<float> == 1.5, "");
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template<typename T> T* vc<T*> = new T();
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template<> constexpr float vc<float> = 1.5;
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int* intpc = vc<int*>;
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static_assert(vc<float> == 1.5, "");
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char* intpd = vd<char*>;
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}
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namespace spec_join1 {
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template int va<int>;
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int a = va<int>;
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template<typename T> extern T vb;
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int b = vb<int>;
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int* intpb = vd<int*>;
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}
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#endif
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