Thanks, I installed the attached patches.That thing with malloc goes too far. 'char *p = malloc (...);' is a good idiom in C, and it's silly and even counterproductive to require a cast. I worked around the glitch by not using malloc.
From 45b38c225bcdeef919723c27e81aa5ec97c9a89e Mon Sep 17 00:00:00 2001 From: Paul Eggert <[email protected]> Date: Thu, 7 Aug 2025 13:27:29 -0700 Subject: [PATCH 1/2] Port _AC_C_C99_TEST_GLOBALS to -Wc++-compat MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
Problem reported by Vincent Lefevre in: https://lists.gnu.org/r/autoconf-patches/2025-08/msg00004.html * lib/autoconf/c.m4 (_AC_C_C99_TEST_GLOBALS): and → aND. --- lib/autoconf/c.m4 | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4 index da367790..a36f56c7 100644 --- a/lib/autoconf/c.m4 +++ b/lib/autoconf/c.m4 @@ -1214,7 +1214,8 @@ extern void free (void *); // Check varargs macros. These examples are taken from C99 6.10.3.5. // dprintf is used instead of fprintf to avoid needing to declare -// FILE and stderr. +// FILE and stderr, and "aND" is used instead of "and" to work around +// GCC bug 40564 which is irrelevant here. #define debug(...) dprintf (2, __VA_ARGS__) #define showlist(...) puts (#__VA_ARGS__) #define report(test,...) ((test) ? puts (#test) : printf (__VA_ARGS__)) @@ -1225,7 +1226,7 @@ test_varargs_macros (void) int y = 5678; debug ("Flag"); debug ("X = %d\n", x); - showlist (The first, second, and third items.); + showlist (The first, second, aND third items.); report (x>y, "x is %d but y is %d", x, y); } -- 2.48.1
From 69ebe8fe97b62b678391df02518d67f9a79c2a19 Mon Sep 17 00:00:00 2001 From: Paul Eggert <[email protected]> Date: Thu, 7 Aug 2025 13:50:53 -0700 Subject: [PATCH 2/2] Port _AC_C_C99_TEST_MAIN to -Wc++-compat MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Problem reported by Vincent Lefevre in: https://lists.gnu.org/r/autoconf-patches/2025-08/msg00004.html * lib/autoconf/c.m4 (_AC_C_C99_TEST_MAIN): Don’t use malloc. --- lib/autoconf/c.m4 | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4 index a36f56c7..689e506d 100644 --- a/lib/autoconf/c.m4 +++ b/lib/autoconf/c.m4 @@ -1324,8 +1324,8 @@ ac_c_conftest_c99_main=' test_varargs_macros (); // Check flexible array members. - struct incomplete_array *ia = - malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10)); + static struct incomplete_array *volatile incomplete_array_pointer; + struct incomplete_array *ia = incomplete_array_pointer; ia->datasize = 10; for (int i = 0; i < ia->datasize; ++i) ia->data[i] = i * 1.234; -- 2.48.1
