From: Matt Turner <mattst88@gmail.com>
Date: Sun, 26 Jul 2026 18:43:11 +0000 (-0400)
Subject: powerpc: Fix -mlong-double-128 IBM format configure test for Clang
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=559d0f77f3ee1000cf8a2d0baba7a59a1ec45f50;p=thirdparty%2Fglibc.git

powerpc: Fix -mlong-double-128 IBM format configure test for Clang

The check for -mlong-double-128 IBM extended format support wrapped its
test code in AC_LANG_PROGRAM, which places the body inside main().  The
body defines a function, so it became a nested function definition -- a
GCC extension that Clang does not implement, making the test fail with
Clang.

Use AC_LANG_SOURCE so the function is defined at file scope, and
regenerate configure.

Reviewed-by: Sam James <sam@gentoo.org>
---

diff --git a/sysdeps/unix/sysv/linux/powerpc/configure b/sysdeps/unix/sysv/linux/powerpc/configure
index ef2055db92..eb8578404f 100644
--- a/sysdeps/unix/sysv/linux/powerpc/configure
+++ b/sysdeps/unix/sysv/linux/powerpc/configure
@@ -12,18 +12,12 @@ else case e in #(
 CFLAGS="$CFLAGS -mlong-double-128"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <float.h>
-int
-main (void)
-{
 
+#include <float.h>
 #if LDBL_MANT_DIG != 106
 # error "compiler doesn't implement IBM extended format of long double"
 #endif
 long double foobar (long double x) { return x; }
-  ;
-  return 0;
-}
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"
 then :
diff --git a/sysdeps/unix/sysv/linux/powerpc/configure.ac b/sysdeps/unix/sysv/linux/powerpc/configure.ac
index 42347a66fc..ca0f82da08 100644
--- a/sysdeps/unix/sysv/linux/powerpc/configure.ac
+++ b/sysdeps/unix/sysv/linux/powerpc/configure.ac
@@ -6,7 +6,8 @@ AC_CACHE_CHECK(whether $CC $CFLAGS -mlong-double-128 uses IBM extended format,
 	       libc_cv_mlong_double_128ibm, [dnl
 save_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -mlong-double-128"
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <float.h>]], [[
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <float.h>
 #if LDBL_MANT_DIG != 106
 # error "compiler doesn't implement IBM extended format of long double"
 #endif