Fix "Undefined symbols" linker error when DocumentChange::npos was used by dconeybe · Pull Request #474 · firebase/firebase-cpp-sdk

dconeybe · 2021-06-16T15:09:20Z

Fix a bug where accessing firebase::firestore::DocumentChange::npos from a non-Android platform results in a linker error:

Undefined symbols for architecture x86_64:
  "firebase::firestore::DocumentChange::npos", referenced from:
      firebase_testapp_automated::FirebaseFirestoreBasicTest_TestDocumentChangeNpos_Test::TestBody() in integration_test.cc.o
ld: symbol(s) not found for architecture x86_64

Here is the declaration of npos:

firebase-cpp-sdk/firestore/src/include/firebase/firestore/document_change.h

Lines 66 to 72 in 7ae9569

    
           #if defined(ANDROID) 
        
             // Older NDK (r16b) fails to define this properly. Fix this when support for 
        
             // the older NDK is removed. 
        
             static const std::size_t npos; 
        
           #else 
        
             static constexpr std::size_t npos = static_cast<std::size_t>(-1); 
        
           #endif  // defined(ANDROID)

The fix is to add a definition of npos into the corresponding .cc file

firestore/src/common/document_change.cc

var-const

Thanks for fixing this! Please make sure that this is ok to merge/the version number in the changelog is up-to-date.

var-const · 2021-06-18T00:25:13Z

release_build_files/readme.md


+### 8.1.0
+-   Changes
+    -   Firestore: Fixed a linker error when DocumentChange::npos was used.


Nit: please wrap DocumentChange::npos in backticks.

var-const · 2021-06-18T00:26:19Z

release_build_files/readme.md

+### 8.1.0
+-   Changes
+    -   Firestore: Fixed a linker error when DocumentChange::npos was used.
+        ([#474](https://github.com/firebase/firebase-cpp-sdk/pull/474)).


Optional: I think the changelog usually links to issues, not PRs, so this link could probably be omited.

It looks like there is a mixture of issues and PRs linked to in previous change log entries. I see your point but I personally feel like adding a link to additional context is useful for future readers. If this issue had been discovered externally then there would be an issue number; however, since it was discovered by me, a developer on the Firestore team, no issue was created. IMO, providing this link adds value at no cost. If you feel strongly I can remove it, but I like having it here.

firestore/src/common/document_change.cc

dconeybe

Please make sure that this is ok to merge/the version number in the changelog is up-to-date.

I confirmed the version number at go/firebase-cpp-release.

dconeybe · 2021-06-21T15:19:08Z

release_build_files/readme.md


+### 8.1.0
+-   Changes
+    -   Firestore: Fixed a linker error when DocumentChange::npos was used.


dconeybe · 2021-06-21T15:23:13Z

release_build_files/readme.md

+### 8.1.0
+-   Changes
+    -   Firestore: Fixed a linker error when DocumentChange::npos was used.
+        ([#474](https://github.com/firebase/firebase-cpp-sdk/pull/474)).


It looks like there is a mixture of issues and PRs linked to in previous change log entries. I see your point but I personally feel like adding a link to additional context is useful for future readers. If this issue had been discovered externally then there would be an issue number; however, since it was discovered by me, a developer on the Firestore team, no issue was created. IMO, providing this link adds value at no cost. If you feel strongly I can remove it, but I like having it here.

github-actions · 2021-06-21T18:18:14Z

❌ Integration test FAILED

Requested by @dconeybe on commit de68c2b
Last updated: Mon Jun 21 13:28 PDT 2021
View integration test log & download artifacts

Failures	Configs
remote_config	[TEST] [FAILURE] [iOS] [macos] [ios_target] (1 failed tests) TestFetchInterval

Fix "Undefined symbols" linker error when DocumentChange::npos was used.

77d3475

dconeybe added the api: firestore label Jun 16, 2021

dconeybe self-assigned this Jun 16, 2021

google-cla bot added the cla: yes label Jun 16, 2021

Add change log entry

ee4fa77

dconeybe requested a review from var-const June 16, 2021 16:14

dconeybe assigned var-const and unassigned dconeybe Jun 16, 2021

dconeybe added 2 commits June 16, 2021 14:28

Fix version number in change log entry (8.0.1 -> 8.1.0)

3be0e69

Merge remote-tracking branch 'origin/main' at 3803777

544ae52

dconeybe commented Jun 17, 2021

View reviewed changes

firestore/src/common/document_change.cc Show resolved Hide resolved

var-const previously approved these changes Jun 18, 2021

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var-const assigned dconeybe and unassigned var-const Jun 18, 2021

Merge 'origin/main' at 287f764

005ae9b

dconeybe commented Jun 21, 2021

View reviewed changes

Add backticks around DocumentChange::npos.

1e1c41d

dconeybe dismissed var-const’s stale review via 1e1c41d June 21, 2021 15:25

dconeybe enabled auto-merge (squash) June 21, 2021 15:25

dconeybe requested a review from var-const June 21, 2021 15:25

dconeybe assigned var-const and unassigned dconeybe Jun 21, 2021

var-const approved these changes Jun 21, 2021

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dconeybe merged commit de68c2b into main Jun 21, 2021

github-actions bot added the tests: in-progress This PR's integration tests are in progress. label Jun 21, 2021

github-actions bot added the tests: failed This PR's integration tests failed. label Jun 21, 2021

firebase-workflow-trigger bot removed the tests: in-progress This PR's integration tests are in progress. label Jun 21, 2021

dconeybe deleted the dconeybe/DefineDocumentChangeNpos branch June 22, 2021 19:44

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Fix "Undefined symbols" linker error when DocumentChange::npos was used#474

Fix "Undefined symbols" linker error when DocumentChange::npos was used#474
dconeybe merged 6 commits intomainfrom
dconeybe/DefineDocumentChangeNpos

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	#if defined(ANDROID)
	// Older NDK (r16b) fails to define this properly. Fix this when support for
	// the older NDK is removed.
	static const std::size_t npos;
	#else
	static constexpr std::size_t npos = static_cast<std::size_t>(-1);
	#endif // defined(ANDROID)

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dconeybe commented Jun 16, 2021 •

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