From dd03974882f85ca04e35cfbc97f7ff756f5d5c20 Mon Sep 17 00:00:00 2001 From: V3n3RiX Date: Mon, 20 Feb 2023 20:21:39 +0000 Subject: gentoo auto-resync : 20:02:2023 - 20:21:39 --- ...x-apple-m1-crash-by-explicit-pointer-cast.patch | 48 ++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 sys-devel/flex/files/flex-2.6.4-fix-apple-m1-crash-by-explicit-pointer-cast.patch (limited to 'sys-devel/flex/files/flex-2.6.4-fix-apple-m1-crash-by-explicit-pointer-cast.patch') diff --git a/sys-devel/flex/files/flex-2.6.4-fix-apple-m1-crash-by-explicit-pointer-cast.patch b/sys-devel/flex/files/flex-2.6.4-fix-apple-m1-crash-by-explicit-pointer-cast.patch new file mode 100644 index 000000000000..c594262d2cb0 --- /dev/null +++ b/sys-devel/flex/files/flex-2.6.4-fix-apple-m1-crash-by-explicit-pointer-cast.patch @@ -0,0 +1,48 @@ +https://github.com/westes/flex/issues/539 +https://github.com/westes/flex/pull/554 +https://bugs.gentoo.org/871324 + +This is a backported version for applying to v2.6.4 +instead of git. + +From cce2df853386d5b5b60445b1204dcca08e9f259e Mon Sep 17 00:00:00 2001 +From: Yifeng Li +Date: Mon, 20 Feb 2023 11:23:52 +0000 +Subject: [PATCH] Fix #539 crash on Apple M1 by casting 0 to (char *) + explicitly + +Currently, when the NULL-terminated variadic function +filter_create_ext() is invoked, the value "0" is passed as +the last argument to act as a terminator. However, this is +an integer value, which is incompatible with the pointer +data type expected by filter_create_ext(). + +This is undefined behavior in C, correct operation is not +guaranteed. In fact, it causes flex to crash on Apple M1 +when GCC is used - the loop is not terminated when it should, +instead, it keeps running, corrupting the argument list for +invoking m4. As a result, it creates the following error: + +> flex: fatal internal error, exec of gm4 failed + +This commit fixes the problem by explicitly casting the value 0 to +the correct pointer type (char *). + +Signed-off-by: Yifeng Li +--- + src/main.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/src/main.c b/src/main.c +index e5eac44fe..5c9086183 100644 +--- a/src/main.c ++++ b/src/main.c +@@ -380,7 +380,7 @@ void check_options (void) + } + } + } +- filter_create_ext(output_chain, m4, "-P", 0); ++ filter_create_ext(output_chain, m4, "-P", (char *) 0); + filter_create_int(output_chain, filter_fix_linedirs, NULL); + + /* For debugging, only run the requested number of filters. */ -- cgit v1.2.3