Hi, I found name of exported resursively expanded variable with $(shell ...) cannot be too long in gnu make version >= 4.4, otherwise a segmentation fault is triggled. I'm not sure if variable-name-too-long is a bug. However, make is supposed to tell me what's going wrong.
Here is a Makefile that can reproduce the segmentation fault: THIS_LONG_VARIABLE_NAME_PREDUCE_THE_ERROR= $(shell echo hello) export THIS_LONG_VARIABLE_NAME_PREDUCE_THE_ERROR all: ; echo "abc" Commands log: user@fedora:~$ make echo "abc" Segmentation fault (core dumped) user@fedora:~$ make --version GNU Make 4.4.1 Built for x86_64-redhat-linux-gnu ... user@fedora:~$ make --help ... This program built for x86_64-redhat-linux-gnu Report bugs to <bug-make@gnu.org> The error can be reproduced on fedora 39 with the following 2 official builds of make by fedora project: * make-4.4-1.fc38: https://kojipkgs.fedoraproject.org//packages/make/4.4/1.fc38/x86_64/make-4.4-1.fc38.x86_64.rpm * make-4.4.1-2.fc39: https://kojipkgs.fedoraproject.org//packages/make/4.4.1/2.fc39/x86_64/make-4.4.1-2.fc39.x86_64.rpm There is NO error with gnu make 4.3, tested both on Ubuntu 23.04 (make 4.3-4.1build1) and fedora39 (make-4.3-1.fc33): * make 4.3-4.1build1: http://mirrors.kernel.org/ubuntu/pool/main/m/make-dfsg/make_4.3-4.1build1_amd64.deb * make-4.3-1.fc33: https://kojipkgs.fedoraproject.org//packages/make/4.3/1.fc33/x86_64/make-4.3-1.fc33.x86_64.rpm I think it may be caused by the new feature "shell-export". As is the "NEWS" file of Version 4.4 (31 Oct 2022): * WARNING: Backward-incompatibility! Previously makefile variables marked as export were not exported to command started by the $(shell ...) function. Now, all exported variables are exported to $(shell ...). If this leads to recursion during expansion, the for backward-compatibility the value from the original environment is used. To detect this change search for 'shell-export' in the .FEATURES variable. Best regards, Yiren Guo
Makefile
Description: Makefile
