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Add configure test to ensure GCC bug is fixed

Browse source 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80431

(test is adapted from issue, test does not test for GCC-specific
behavior but rather absence of bug, so test is good with other compilers
too.)
This commit is contained in:
John Ericson 2023-10-31 12:01:13 -04:00
parent 12a0ae73db
commit 1f4525531e
2 changed files with 67 additions and 0 deletions
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3
configure.ac
View file

@ -68,6 +68,9 @@ case "$host_os" in
esac
ENSURE_NO_GCC_BUG_80431
# Check for pubsetbuf.
AC_MSG_CHECKING([for pubsetbuf])
AC_LANG_PUSH(C++)

64
m4/gcc_bug_80431.m4 Normal file
View file

@ -0,0 +1,64 @@
# Ensure that this bug is not present in the C++ toolchain we are using.
#
# URL for bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80431
#
# The test program is from that issue, with only a slight modification
# to set an exit status instead of printing strings.
AC_DEFUN([ENSURE_NO_GCC_BUG_80431],
[
AC_MSG_CHECKING([that GCC bug 80431 is fixed])
AC_LANG_PUSH(C++)
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[
#include <cstdio>
static bool a = true;
static bool b = true;
struct Options { };
struct Option
{
Option(Options * options)
{
a = false;
}
~Option()
{
b = false;
}
};
struct MyOptions : Options { };
struct MyOptions2 : virtual MyOptions
{
Option foo{this};
};
]],
[[
{
MyOptions2 opts;
}
return (a << 1) | b;
]])],
[status_80431=0],
[status_80431=$?],
[
# Assume we're bug-free when cross-compiling
])
AC_LANG_POP(C++)
AS_CASE([$status_80431],
[0],[
AC_MSG_RESULT(yes)
],
[2],[
AC_MSG_RESULT(no)
AC_MSG_ERROR(Cannot build Nix with C++ compiler with this bug)
],
[
AC_MSG_RESULT(unexpected result $status_80431: not expected failure with bug, ignoring)
])
])