[{"id":3675793,"web_url":"http://patchwork.ozlabs.org/comment/3675793/","msgid":"<1s6sn269-p691-05o5-0039-7s947p3702q1@fhfr.qr>","list_archive_url":null,"date":"2026-04-10T10:43:46","subject":"Re: [PATCH v2] config: increase stack reserve to 64MB for the\n toolchain on Windows [PR69639]","submitter":{"id":4338,"url":"http://patchwork.ozlabs.org/api/people/4338/","name":"Richard Biener","email":"rguenther@suse.de"},"content":"On Fri, 10 Apr 2026, Torbjörn SVENSSON wrote:\n\n> Changes since v1:\n> \n> - Changed the stack reserve to 64MB.\n> - Updated comment to state that the value is in sync with Linux (runtime).\n> \n> \n> I got approval from Andrew Pinski for 16MB with update for comment, but since\n> I change the value (there was also an extra trailing 0 in my patch), for\n> correctness, I seek new aproval.\n> \n> Ok for trunk and releases/gcc-15?\n\nOK, but please give the target maintainer a chance to chime in.\n\nRichard.\n\n> --\n> \n> This fixes fails like below on Windows.\n> \n> FAIL: gcc.c-torture/compile/limits-exprparen.c -O0 (test for excess errors)\n> \n> On Linux, maybe also other targets, the stack limit is dynamically\n> changed when the application launches.\n> \n> Regtested with arm-none-eabi on Windows on top of\n> r16-8253-geb50d28a9353e9.\n> \n> config/ChangeLog:\n> \n> \tPR target/69639\n> \t* mh-cygwin: Increase to 64MB stack reserve.\n> \t* mh-mingw: Likewise.\n> \n> Signed-off-by: Torbjörn SVENSSON \n> ---\n> config/mh-cygwin | 9 +++++----\n> config/mh-mingw | 9 +++++----\n> 2 files changed, 10 insertions(+), 8 deletions(-)\n> \n> diff --git a/config/mh-cygwin b/config/mh-cygwin\n> index 1f746bdea84..194f70de4d5 100644\n> --- a/config/mh-cygwin\n> +++ b/config/mh-cygwin\n> @@ -1,4 +1,5 @@\n> -# Increase stack limit to a figure based on the Linux default, with 4MB added\n> -# as GCC turns out to need that much more to pass all the limits-* tests.\n> -LDFLAGS += -Wl,--stack,12582912\n> -BOOT_LDFLAGS += -Wl,--stack,12582912\n> +# Increase stack limit, to the same value that GCC tries to change to at\n> +# startup on Linux, as GCC turns out to need that much more to pass all the\n> +# limits-* tests.\n> +LDFLAGS += -Wl,--stack,67108864\n> +BOOT_LDFLAGS += -Wl,--stack,67108864\n> diff --git a/config/mh-mingw b/config/mh-mingw\n> index f5fb064813f..a225b80914d 100644\n> --- a/config/mh-mingw\n> +++ b/config/mh-mingw\n> @@ -8,7 +8,8 @@ STAGE2_CXXFLAGS += -D__USE_MINGW_ACCESS\n> STAGE3_CXXFLAGS += -D__USE_MINGW_ACCESS\n> STAGE4_CXXFLAGS += -D__USE_MINGW_ACCESS\n> \n> -# Increase stack limit to a figure based on the Linux default, with 4MB added\n> -# as GCC turns out to need that much more to pass all the limits-* tests.\n> -LDFLAGS += -Wl,--stack,12582912\n> -BOOT_LDFLAGS += -Wl,--stack,12582912\n> +# Increase stack limit, to the same value that GCC tries to change to at\n> +# startup on Linux, as GCC turns out to need that much more to pass all the\n> +# limits-* tests.\n> +LDFLAGS += -Wl,--stack,67108864\n> +BOOT_LDFLAGS += -Wl,--stack,67108864\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=wGE/gdQo;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=UDDx6e06;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=WwZDnNjE;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=Gwu3x0gH;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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