From f047133e7b43433e77dc01741d559ac9e2a9ea58 Mon Sep 17 00:00:00 2001 From: Sergei Trofimovich Date: Sun, 20 Feb 2022 09:39:59 +0000 Subject: build: Test '-flto' on both compiler and linker. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Before the change ./configure incorrectly enabled -flto on toolchains that support -flto on compiler side but don't support -flto on linker side. This caused incorrect type size detection on nixpkgs' Darwin: configure:54594: checking size of size_t configure:54600: clang -std=gnu11 -o conftest -g -O2 -flto conftest.c >&5 ld: warning: ignoring file /private/tmp/nix-build-guile-3.0.8.drv-0/conftest-00e93d.o, building for macOS-x86_64 but attempting to link with file built for unknown-unsupported file format ( 0xDE 0xC0 0x17 0x0B 0x00 0x00 0x00 0x00 0x14 0x00 0x00 0x00 0x80 0x1A 0x00 0x00 ) Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 clang-11: error: linker command failed with exit code 1 (use -v to see invocation) Taken from https://github.com/NixOS/nixpkgs/pull/160051#issuecomment-1046105041 The change makes sure -flto support tests basic support of just for object file generation but for linker as well. * configure.ac: use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE. Signed-off-by: Ludovic Courtès --- NEWS | 1 + 1 file changed, 1 insertion(+) (limited to 'NEWS') diff --git a/NEWS b/NEWS index 0c77f8dd7..b0217a429 100644 --- a/NEWS +++ b/NEWS @@ -13,6 +13,7 @@ Changes in 3.0.9 (since 3.0.8) (https://bugs.gnu.org/54198) ** psyntax honors source properties coming from read hash extensions (https://bugs.gnu.org/54003) +** ./configure checks whether the linker supports '-flto' (needed on macOS) Changes in 3.0.8 (since 3.0.7) -- cgit v1.2.1