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[clang][modules] Derive mtime from PCM timestamps, not PCM files #162965
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235 changes: 125 additions & 110 deletions
235
clang/test/Modules/fmodules-validate-once-per-build-session.c
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,119 +1,134 @@ | ||
| #include "foo.h" | ||
| #include "bar.h" | ||
|
|
||
| // Clear the module cache. | ||
| // RUN: rm -rf %t | ||
| // RUN: mkdir -p %t/Inputs | ||
| // RUN: mkdir -p %t/modules-to-compare | ||
| // This tests the behavior of -fmodules-validate-once-per-build-session with | ||
| // different combinations of flags and states of the module cache. | ||
|
|
||
| // === | ||
| // Create a module. We will use -I or -isystem to determine whether to treat | ||
| // foo.h as a system header. | ||
| // RUN: echo 'void meow(void);' > %t/Inputs/foo.h | ||
| // RUN: echo 'void woof(void);' > %t/Inputs/bar.h | ||
| // RUN: echo 'module Foo { header "foo.h" }' > %t/Inputs/module.modulemap | ||
| // RUN: echo 'extern module Bar "bar.modulemap"' >> %t/Inputs/module.modulemap | ||
| // RUN: echo 'module Bar { header "bar.h" }' > %t/Inputs/bar.modulemap | ||
| // Note: The `sleep 1` commands sprinkled throughout this test make the strict | ||
| // comparisons of epoch mtimes work as expected. Some may be unnecessary, | ||
| // but make the intent clearer. | ||
|
|
||
| // === | ||
| // Compile the module. | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache -fsyntax-only -isystem %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user -fsyntax-only -I %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user-no-force -fsyntax-only -I %t/Inputs -fno-modules-force-validate-user-headers -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: ls -R %t/modules-cache | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Bar.pcm.timestamp | ||
| // RUN: cp %t/modules-cache/Foo.pcm %t/modules-to-compare/Foo-before.pcm | ||
| // RUN: cp %t/modules-cache/Bar.pcm %t/modules-to-compare/Bar-before.pcm | ||
| // RUN: cp %t/modules-cache-user/Foo.pcm %t/modules-to-compare/Foo-before-user.pcm | ||
| // RUN: cp %t/modules-cache-user/Bar.pcm %t/modules-to-compare/Bar-before-user.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Foo.pcm %t/modules-to-compare/Foo-before-user-no-force.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Bar.pcm %t/modules-to-compare/Bar-before-user-no-force.pcm | ||
|
|
||
| // === | ||
| // Use it, and make sure that we did not recompile it. | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache -fsyntax-only -isystem %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user -fsyntax-only -I %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-use-no-force -fsyntax-only -I %t/Inputs -fno-modules-force-validate-user-headers -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: ls -R %t/modules-cache | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Bar.pcm.timestamp | ||
| // RUN: cp %t/modules-cache/Foo.pcm %t/modules-to-compare/Foo-after.pcm | ||
| // RUN: cp %t/modules-cache/Bar.pcm %t/modules-to-compare/Bar-after.pcm | ||
| // RUN: cp %t/modules-cache-user/Foo.pcm %t/modules-to-compare/Foo-after-user.pcm | ||
| // RUN: cp %t/modules-cache-user/Bar.pcm %t/modules-to-compare/Bar-after-user.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Foo.pcm %t/modules-to-compare/Foo-after-user-no-force.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Bar.pcm %t/modules-to-compare/Bar-after-user-no-force.pcm | ||
| // RUN: rm -rf %t | ||
| // RUN: split-file %s %t | ||
| // RUN: echo "-fsyntax-only -fmodules -fmodules-cache-path=%/t/module-cache" > %t/ctx.rsp | ||
| // RUN: echo "-fbuild-session-file=%/t/module-cache/session.timestamp" >> %t/ctx.rsp | ||
| // RUN: echo "-fmodules-validate-once-per-build-session" >> %t/ctx.rsp | ||
| // RUN: echo "-Rmodule-build -Rmodule-validation" >> %t/ctx.rsp | ||
|
|
||
| // RUN: diff %t/modules-to-compare/Foo-before.pcm %t/modules-to-compare/Foo-after.pcm | ||
| // RUN: diff %t/modules-to-compare/Bar-before.pcm %t/modules-to-compare/Bar-after.pcm | ||
| // RUN: diff %t/modules-to-compare/Foo-before-user.pcm %t/modules-to-compare/Foo-after-user.pcm | ||
| // RUN: diff %t/modules-to-compare/Bar-before-user.pcm %t/modules-to-compare/Bar-after-user.pcm | ||
| // RUN: diff %t/modules-to-compare/Foo-before-user-no-force.pcm %t/modules-to-compare/Foo-after-user-no-force.pcm | ||
| // RUN: diff %t/modules-to-compare/Bar-before-user-no-force.pcm %t/modules-to-compare/Bar-after-user-no-force.pcm | ||
| //--- include/foo.h | ||
| //--- include/module.modulemap | ||
| module Foo { header "foo.h" } | ||
|
|
||
| // === | ||
| // Change the sources. | ||
| //--- clean.c | ||
| // Clean module cache. Modules will get compiled regardless of validation settings. | ||
| // RUN: mkdir %t/module-cache | ||
| // RUN: sleep 1 | ||
| // RUN: echo 'void meow2(void);' > %t/Inputs/foo.h | ||
| // RUN: echo 'module Bar { header "bar.h" export * }' > %t/Inputs/bar.modulemap | ||
| // RUN: touch %t/module-cache/session.timestamp | ||
| // RUN: sleep 1 | ||
| // RUN: %clang @%t/ctx.rsp %t/clean.c -DCTX=1 \ | ||
| // RUN: -isystem %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/clean.c | ||
| // RUN: %clang @%t/ctx.rsp %t/clean.c -DCTX=2 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/clean.c | ||
| // RUN: %clang @%t/ctx.rsp %t/clean.c -DCTX=3 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers -Xclang -fno-modules-force-validate-user-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/clean.c | ||
| #include "foo.h" | ||
| // CHECK: building module 'Foo' | ||
|
|
||
| // === | ||
| // Use the module, and make sure that we did not recompile it if foo.h or | ||
| // module.modulemap are system files or user files with force validation disabled, | ||
| // even though the sources changed. | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache -fsyntax-only -isystem %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user -fsyntax-only -I %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user-no-force -fsyntax-only -I %t/Inputs -fno-modules-force-validate-user-headers -fmodules-validate-system-headers -fbuild-session-timestamp=1390000000 -fmodules-validate-once-per-build-session %s | ||
| // RUN: ls -R %t/modules-cache | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Bar.pcm.timestamp | ||
| // RUN: cp %t/modules-cache/Foo.pcm %t/modules-to-compare/Foo-after.pcm | ||
| // RUN: cp %t/modules-cache/Bar.pcm %t/modules-to-compare/Bar-after.pcm | ||
| // RUN: cp %t/modules-cache-user/Foo.pcm %t/modules-to-compare/Foo-after-user.pcm | ||
| // RUN: cp %t/modules-cache-user/Bar.pcm %t/modules-to-compare/Bar-after-user.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Foo.pcm %t/modules-to-compare/Foo-after-user-no-force.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Bar.pcm %t/modules-to-compare/Bar-after-user-no-force.pcm | ||
| //--- no-change-same-session.c | ||
| // Populated module cache in the same build session with unchanged inputs. | ||
| // Validation only happens when it's forced for user headers. No compiles. | ||
| // RUN: sleep 1 | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-same-session.c -DCTX=1 \ | ||
| // RUN: -isystem %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-same-session.c --check-prefix=CHECK-NO-VALIDATION-OR-BUILD --allow-empty | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-same-session.c -DCTX=2 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-same-session.c --check-prefix=CHECK-VALIDATION-ONLY | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-same-session.c -DCTX=3 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers -Xclang -fno-modules-force-validate-user-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-same-session.c --check-prefix=CHECK-NO-VALIDATION-OR-BUILD --allow-empty | ||
| #include "foo.h" | ||
| // CHECK-NO-VALIDATION-OR-BUILD-NOT: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-NO-VALIDATION-OR-BUILD-NOT: building module 'Foo' | ||
| // CHECK-VALIDATION-ONLY: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-VALIDATION-ONLY-NOT: building module 'Foo' | ||
|
|
||
| // RUN: diff %t/modules-to-compare/Foo-before.pcm %t/modules-to-compare/Foo-after.pcm | ||
| // RUN: diff %t/modules-to-compare/Bar-before.pcm %t/modules-to-compare/Bar-after.pcm | ||
| // When foo.h is an user header, we will validate it by default. | ||
| // RUN: not diff %t/modules-to-compare/Foo-before-user.pcm %t/modules-to-compare/Foo-after-user.pcm | ||
| // RUN: not diff %t/modules-to-compare/Bar-before-user.pcm %t/modules-to-compare/Bar-after-user.pcm | ||
| // When foo.h is an user header, we will not validate it if force validation is turned off. | ||
| // RUN: diff %t/modules-to-compare/Foo-before-user-no-force.pcm %t/modules-to-compare/Foo-after-user-no-force.pcm | ||
| // RUN: diff %t/modules-to-compare/Bar-before-user-no-force.pcm %t/modules-to-compare/Bar-after-user-no-force.pcm | ||
| //--- change-same-session.c | ||
| // Populated module cache in the same build session with changed inputs. | ||
| // Validation only happens when it's forced for user headers and results in compilation. | ||
| // RUN: sleep 1 | ||
| // RUN: touch %t/include/foo.h | ||
| // RUN: sleep 1 | ||
| // RUN: %clang @%t/ctx.rsp %t/change-same-session.c -DCTX=1 \ | ||
| // RUN: -isystem %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/change-same-session.c --check-prefix=CHECK-NO-VALIDATION-OR-BUILD --allow-empty | ||
| // RUN: %clang @%t/ctx.rsp %t/change-same-session.c -DCTX=2 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/change-same-session.c --check-prefix=CHECK-VALIDATION-AND-BUILD | ||
| // RUN: %clang @%t/ctx.rsp %t/change-same-session.c -DCTX=3 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers -Xclang -fno-modules-force-validate-user-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/change-same-session.c --check-prefix=CHECK-NO-VALIDATION-OR-BUILD --allow-empty | ||
| #include "foo.h" | ||
| // CHECK-NO-VALIDATION-OR-BUILD-NOT: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-NO-VALIDATION-OR-BUILD-NOT: building module 'Foo' | ||
| // CHECK-VALIDATION-AND-BUILD: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-VALIDATION-AND-BUILD: building module 'Foo' | ||
|
|
||
| // === | ||
| // Recompile the module if the today's date is before 01 January 2100. | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache -fsyntax-only -isystem %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=4102441200 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user -fsyntax-only -I %t/Inputs -fmodules-validate-system-headers -fbuild-session-timestamp=4102441200 -fmodules-validate-once-per-build-session %s | ||
| // RUN: %clang_cc1 -cc1 -fmodules -fimplicit-module-maps -fdisable-module-hash -fmodules-cache-path=%t/modules-cache-user-no-force -fsyntax-only -I %t/Inputs -fno-modules-force-validate-user-headers -fmodules-validate-system-headers -fbuild-session-timestamp=4102441200 -fmodules-validate-once-per-build-session %s | ||
| // RUN: ls -R %t/modules-cache | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user | grep Bar.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Foo.pcm.timestamp | ||
| // RUN: ls -R %t/modules-cache-user-no-force | grep Bar.pcm.timestamp | ||
| // RUN: cp %t/modules-cache/Foo.pcm %t/modules-to-compare/Foo-after.pcm | ||
| // RUN: cp %t/modules-cache/Bar.pcm %t/modules-to-compare/Bar-after.pcm | ||
| // RUN: cp %t/modules-cache-user/Foo.pcm %t/modules-to-compare/Foo-after-user.pcm | ||
| // RUN: cp %t/modules-cache-user/Bar.pcm %t/modules-to-compare/Bar-after-user.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Foo.pcm %t/modules-to-compare/Foo-after-user-no-force.pcm | ||
| // RUN: cp %t/modules-cache-user-no-force/Bar.pcm %t/modules-to-compare/Bar-after-user-no-force.pcm | ||
| //--- change-new-session.c | ||
| // Populated module cache in a new build session with changed inputs. | ||
| // All configurations validate and recompile. | ||
| // RUN: sleep 1 | ||
| // RUN: touch %t/include/foo.h | ||
| // RUN: sleep 1 | ||
| // RUN: touch %t/module-cache/session.timestamp | ||
| // RUN: sleep 1 | ||
| // RUN: %clang @%t/ctx.rsp %t/change-new-session.c -DCTX=1 \ | ||
| // RUN: -isystem %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/change-new-session.c --check-prefixes=CHECK,CHECK-VALIDATE-ONCE | ||
| // NOTE: Forced user headers validation causes redundant validation of the just-built module. | ||
| // RUN: %clang @%t/ctx.rsp %t/change-new-session.c -DCTX=2 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/change-new-session.c --check-prefixes=CHECK,CHECK-FORCE-VALIDATE-TWICE | ||
| // RUN: %clang @%t/ctx.rsp %t/change-new-session.c -DCTX=3 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers -Xclang -fno-modules-force-validate-user-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/change-new-session.c --check-prefixes=CHECK,CHECK-VALIDATE-ONCE | ||
| #include "foo.h" | ||
| // CHECK: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK: building module 'Foo' | ||
| // CHECK-VALIDATE-ONCE-NOT: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-FORCE-VALIDATE-TWICE: validating {{[0-9]+}} input files in module 'Foo' | ||
|
|
||
| // RUN: not diff %t/modules-to-compare/Foo-before.pcm %t/modules-to-compare/Foo-after.pcm | ||
| // RUN: not diff %t/modules-to-compare/Bar-before.pcm %t/modules-to-compare/Bar-after.pcm | ||
| // RUN: not diff %t/modules-to-compare/Foo-before-user.pcm %t/modules-to-compare/Foo-after-user.pcm | ||
| // RUN: not diff %t/modules-to-compare/Bar-before-user.pcm %t/modules-to-compare/Bar-after-user.pcm | ||
| // RUN: not diff %t/modules-to-compare/Foo-before-user-no-force.pcm %t/modules-to-compare/Foo-after-user-no-force.pcm | ||
| // RUN: not diff %t/modules-to-compare/Bar-before-user-no-force.pcm %t/modules-to-compare/Bar-after-user-no-force.pcm | ||
| //--- no-change-new-session-twice.c | ||
| // Populated module cache in a new build session with unchanged inputs. | ||
| // At first, all configurations validate but don't recompile. | ||
| // RUN: sleep 1 | ||
| // RUN: touch %t/module-cache/session.timestamp | ||
| // RUN: sleep 1 | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-new-session-twice.c -DCTX=1 \ | ||
| // RUN: -isystem %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-new-session-twice.c --check-prefix=CHECK-ONCE | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-new-session-twice.c -DCTX=2 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-new-session-twice.c --check-prefix=CHECK-ONCE | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-new-session-twice.c -DCTX=3 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers -Xclang -fno-modules-force-validate-user-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-new-session-twice.c --check-prefix=CHECK-ONCE | ||
| // | ||
| // Then, only the forced user header validation performs redundant validation (but no compilation). | ||
| // All other configurations do not validate and do not compile. | ||
| // RUN: sleep 1 | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-new-session-twice.c -DCTX=1 \ | ||
| // RUN: -isystem %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-new-session-twice.c --check-prefix=CHECK-NOT-TWICE --allow-empty | ||
| // NOTE: Forced user headers validation causes redundant validation of the just-validated module. | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-new-session-twice.c -DCTX=2 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-new-session-twice.c --check-prefix=CHECK-ONCE | ||
| // RUN: %clang @%t/ctx.rsp %t/no-change-new-session-twice.c -DCTX=3 \ | ||
| // RUN: -I %t/include -fmodules-validate-system-headers -Xclang -fno-modules-force-validate-user-headers \ | ||
| // RUN: 2>&1 | FileCheck %t/no-change-new-session-twice.c --check-prefix=CHECK-NOT-TWICE --allow-empty | ||
| #include "foo.h" | ||
| // CHECK-ONCE: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-ONCE-NOT: building module 'Foo' | ||
| // CHECK-NOT-TWICE-NOT: validating {{[0-9]+}} input files in module 'Foo' | ||
| // CHECK-NOT-TWICE-NOT: building module 'Foo' | ||
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This is what fails without the fix to
ModuleCache.cpp. We'd use the mtime of the PCM from the old build session instead of the mtime of the PCM.timestampfile from the current build session. That would trigger unnecessary validation.