https://github.com/python/cpython/commit/341f80e81a185c48ebbb2c0115401edf99f59baa
commit: 341f80e81a185c48ebbb2c0115401edf99f59baa
branch: main
author: Vasiliy Kiryanov <[email protected]>
committer: itamaro <[email protected]>
date: 2026-11-04T22:45:47Z
summary:
gh-75929: Fix configure function checks under -Wall -Werror (#161343)
Use `(void)$1` in `PY_CHECK_FUNC` instead of declaring an unused
variable. The unused-variable warning caused configure to report
declared functions such as `fchdir` as missing.
files:
A Misc/NEWS.d/next/Build/2026-11-04-14-37-13.gh-issue-75929.nELdwE.rst
M configure
M configure.ac
diff --git
a/Misc/NEWS.d/next/Build/2026-11-04-14-37-13.gh-issue-75929.nELdwE.rst
b/Misc/NEWS.d/next/Build/2026-11-04-14-37-13.gh-issue-75929.nELdwE.rst
new file mode 100644
index 000000000000000..8ec7f8a0147399f
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-11-04-14-37-13.gh-issue-75929.nELdwE.rst
@@ -0,0 +1,2 @@
+Fix a ``configure`` probe that could omit functions such
+as :func:`os.fchdir` from builds using ``-Wall -Werror``.
diff --git a/configure b/configure
index f85f487e0249d67..47df4c586b4dded 100755
--- a/configure
+++ b/configure
@@ -16885,7 +16885,7 @@ else case e in #(
int
main (void)
{
-void *x=ffi_prep_cif_var
+(void)ffi_prep_cif_var
;
return 0;
}
@@ -16926,7 +16926,7 @@ else case e in #(
int
main (void)
{
-void *x=ffi_prep_closure_loc
+(void)ffi_prep_closure_loc
;
return 0;
}
@@ -16967,7 +16967,7 @@ else case e in #(
int
main (void)
{
-void *x=ffi_closure_alloc
+(void)ffi_closure_alloc
;
return 0;
}
@@ -21956,7 +21956,7 @@ else case e in #(
int
main (void)
{
-void *x=freadlink
+(void)freadlink
;
return 0;
}
@@ -21998,7 +21998,7 @@ else case e in #(
int
main (void)
{
-void *x=strerror_r
+(void)strerror_r
;
return 0;
}
@@ -22041,7 +22041,7 @@ else case e in #(
int
main (void)
{
-void *x=pthread_attr_get_np
+(void)pthread_attr_get_np
;
return 0;
}
@@ -22241,7 +22241,7 @@ else case e in #(
int
main (void)
{
-void *x=chroot
+(void)chroot
;
return 0;
}
@@ -22282,7 +22282,7 @@ else case e in #(
int
main (void)
{
-void *x=link
+(void)link
;
return 0;
}
@@ -22323,7 +22323,7 @@ else case e in #(
int
main (void)
{
-void *x=symlink
+(void)symlink
;
return 0;
}
@@ -22364,7 +22364,7 @@ else case e in #(
int
main (void)
{
-void *x=fchdir
+(void)fchdir
;
return 0;
}
@@ -22405,7 +22405,7 @@ else case e in #(
int
main (void)
{
-void *x=fsync
+(void)fsync
;
return 0;
}
@@ -22446,7 +22446,7 @@ else case e in #(
int
main (void)
{
-void *x=fdatasync
+(void)fdatasync
;
return 0;
}
@@ -22510,7 +22510,7 @@ else case e in #(
int
main (void)
{
-void *x=epoll_create
+(void)epoll_create
;
return 0;
}
@@ -22551,7 +22551,7 @@ else case e in #(
int
main (void)
{
-void *x=epoll_create1
+(void)epoll_create1
;
return 0;
}
@@ -22597,7 +22597,7 @@ else case e in #(
int
main (void)
{
-void *x=kqueue
+(void)kqueue
;
return 0;
}
@@ -22641,7 +22641,7 @@ else case e in #(
int
main (void)
{
-void *x=prlimit
+(void)prlimit
;
return 0;
}
@@ -22683,7 +22683,7 @@ else case e in #(
int
main (void)
{
-void *x=_dyld_shared_cache_contains_path
+(void)_dyld_shared_cache_contains_path
;
return 0;
}
@@ -22732,7 +22732,7 @@ else case e in #(
int
main (void)
{
-void *x=memfd_create
+(void)memfd_create
;
return 0;
}
@@ -22778,7 +22778,7 @@ else case e in #(
int
main (void)
{
-void *x=eventfd
+(void)eventfd
;
return 0;
}
@@ -22824,7 +22824,7 @@ else case e in #(
int
main (void)
{
-void *x=timerfd_create
+(void)timerfd_create
;
return 0;
}
@@ -22872,7 +22872,7 @@ else case e in #(
int
main (void)
{
-void *x=ctermid_r
+(void)ctermid_r
;
return 0;
}
@@ -23011,7 +23011,7 @@ else case e in #(
int
main (void)
{
-void *x=getpagesize
+(void)getpagesize
;
return 0;
}
@@ -24898,7 +24898,7 @@ else case e in #(
int
main (void)
{
-void *x=hstrerror
+(void)hstrerror
;
return 0;
}
@@ -24939,7 +24939,7 @@ else case e in #(
int
main (void)
{
-void *x=getservbyname
+(void)getservbyname
;
return 0;
}
@@ -24980,7 +24980,7 @@ else case e in #(
int
main (void)
{
-void *x=getservbyport
+(void)getservbyport
;
return 0;
}
@@ -25021,7 +25021,7 @@ else case e in #(
int
main (void)
{
-void *x=gethostbyname
+(void)gethostbyname
;
return 0;
}
@@ -25062,7 +25062,7 @@ else case e in #(
int
main (void)
{
-void *x=gethostbyaddr
+(void)gethostbyaddr
;
return 0;
}
@@ -25103,7 +25103,7 @@ else case e in #(
int
main (void)
{
-void *x=getprotobyname
+(void)getprotobyname
;
return 0;
}
@@ -25152,7 +25152,7 @@ else case e in #(
int
main (void)
{
-void *x=inet_aton
+(void)inet_aton
;
return 0;
}
@@ -25198,7 +25198,7 @@ else case e in #(
int
main (void)
{
-void *x=inet_ntoa
+(void)inet_ntoa
;
return 0;
}
@@ -25244,7 +25244,7 @@ else case e in #(
int
main (void)
{
-void *x=inet_pton
+(void)inet_pton
;
return 0;
}
@@ -25290,7 +25290,7 @@ else case e in #(
int
main (void)
{
-void *x=getpeername
+(void)getpeername
;
return 0;
}
@@ -25336,7 +25336,7 @@ else case e in #(
int
main (void)
{
-void *x=getsockname
+(void)getsockname
;
return 0;
}
@@ -25382,7 +25382,7 @@ else case e in #(
int
main (void)
{
-void *x=accept
+(void)accept
;
return 0;
}
@@ -25428,7 +25428,7 @@ else case e in #(
int
main (void)
{
-void *x=bind
+(void)bind
;
return 0;
}
@@ -25474,7 +25474,7 @@ else case e in #(
int
main (void)
{
-void *x=connect
+(void)connect
;
return 0;
}
@@ -25520,7 +25520,7 @@ else case e in #(
int
main (void)
{
-void *x=listen
+(void)listen
;
return 0;
}
@@ -25566,7 +25566,7 @@ else case e in #(
int
main (void)
{
-void *x=recvfrom
+(void)recvfrom
;
return 0;
}
@@ -25612,7 +25612,7 @@ else case e in #(
int
main (void)
{
-void *x=sendto
+(void)sendto
;
return 0;
}
@@ -25658,7 +25658,7 @@ else case e in #(
int
main (void)
{
-void *x=setsockopt
+(void)setsockopt
;
return 0;
}
@@ -25704,7 +25704,7 @@ else case e in #(
int
main (void)
{
-void *x=socket
+(void)socket
;
return 0;
}
@@ -25752,7 +25752,7 @@ else case e in #(
int
main (void)
{
-void *x=setgroups
+(void)setgroups
;
return 0;
}
@@ -27279,7 +27279,7 @@ else case e in #(
int
main (void)
{
-void *x=socketpair
+(void)socketpair
;
return 0;
}
@@ -27904,7 +27904,7 @@ else case e in #(
int
main (void)
{
-void *x=acospi
+(void)acospi
;
return 0;
}
@@ -27946,7 +27946,7 @@ else case e in #(
int
main (void)
{
-void *x=asinpi
+(void)asinpi
;
return 0;
}
@@ -27988,7 +27988,7 @@ else case e in #(
int
main (void)
{
-void *x=atanpi
+(void)atanpi
;
return 0;
}
@@ -28030,7 +28030,7 @@ else case e in #(
int
main (void)
{
-void *x=atan2pi
+(void)atan2pi
;
return 0;
}
@@ -28072,7 +28072,7 @@ else case e in #(
int
main (void)
{
-void *x=cospi
+(void)cospi
;
return 0;
}
@@ -28114,7 +28114,7 @@ else case e in #(
int
main (void)
{
-void *x=sinpi
+(void)sinpi
;
return 0;
}
@@ -28156,7 +28156,7 @@ else case e in #(
int
main (void)
{
-void *x=tanpi
+(void)tanpi
;
return 0;
}
diff --git a/configure.ac b/configure.ac
index 4b8e6d59a5cf46d..1c4a8fac991f48e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -61,7 +61,7 @@ AC_DEFUN([PY_CHECK_FUNC],
[for $1],
[py_var],
[AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM([$2], [void *x=$1])],
+ [AC_LANG_PROGRAM([$2], [(void)$1])],
[AS_VAR_SET([py_var], [yes])],
[AS_VAR_SET([py_var], [no])])]
)
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