https://github.com/python/cpython/commit/487ac27295cab7c81a4afa06a4b49159d70835d3 commit: 487ac27295cab7c81a4afa06a4b49159d70835d3 branch: 3.15 author: Miss Islington (bot) <[email protected]> committer: serhiy-storchaka <[email protected]> date: 2026-07-11T10:22:02Z summary:
[3.15] gh-126877: Fix the configure check for Tcl/Tk with optimizing compilers (GH-153543) (GH-153553) The check assigned the addresses of Tcl_Init() and Tk_Init() to unused variables, which optimizing compilers can eliminate, so it linked even when the libraries were missing. Call the functions instead. (cherry picked from commit ff0a9ae269fa38c21f01bdea1a7ff5d439c4f681) Co-authored-by: Serhiy Storchaka <[email protected]> Co-authored-by: Claude Opus 4.8 <[email protected]> files: A Misc/NEWS.d/next/Build/2026-07-11-07-26-16.gh-issue-126877.Zt7Kq2.rst M configure M configure.ac diff --git a/Misc/NEWS.d/next/Build/2026-07-11-07-26-16.gh-issue-126877.Zt7Kq2.rst b/Misc/NEWS.d/next/Build/2026-07-11-07-26-16.gh-issue-126877.Zt7Kq2.rst new file mode 100644 index 00000000000000..1d7d4fad886c56 --- /dev/null +++ b/Misc/NEWS.d/next/Build/2026-07-11-07-26-16.gh-issue-126877.Zt7Kq2.rst @@ -0,0 +1,2 @@ +Fix the :program:`configure` check for Tcl/Tk which could wrongly succeed +with optimizing compilers when the libraries are missing. diff --git a/configure b/configure index 90f026976d0e54..08a7c663ce0a9c 100755 --- a/configure +++ b/configure @@ -17800,8 +17800,8 @@ int main (void) { - void *x1 = Tcl_Init; - void *x2 = Tk_Init; + Tcl_Init(NULL); + Tk_Init(NULL); ; return 0; diff --git a/configure.ac b/configure.ac index bdb94d6d280338..ead82d6da0b545 100644 --- a/configure.ac +++ b/configure.ac @@ -4643,8 +4643,8 @@ WITH_SAVE_ENV([ # error "Tk older than 8.5.12 not supported" #endif ], [ - void *x1 = Tcl_Init; - void *x2 = Tk_Init; + Tcl_Init(NULL); + Tk_Init(NULL); ]) ], [ have_tcltk=yes _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
