https://github.com/kwk created https://github.com/llvm/llvm-project/pull/165886
When there are multiple `gcc` versions installed, we want `flang` to be able to find the right one based on the triple. Here's `flang` selecting an unwanted `gcc` candidate installation, namely `/usr/lib/gcc/x86_64-linux-gnu/15`: ``` ~/src/llvm-project/main/build-RelWithDebInfo > ./bin/flang -v flang version 22.0.0custombuild Target: x86_64-redhat-linux-gnu Thread model: posix InstalledDir: /home/fedora/src/llvm-project/main/build-RelWithDebInfo/bin System configuration file directory: /etc/clang/ Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/15 Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/15 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/15 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Selected multilib: .;@m64 ``` When passing `--gcc-triple=x86_64-redhat-linux` we get the desired gcc candidate installation, namely `/usr/lib/gcc/x86_64-redhat-linux/15`: ``` ~/src/llvm-project/main/build-RelWithDebInfo > ./bin/flang --gcc-triple=x86_64-redhat-linux -v flang version 22.0.0custombuild Target: x86_64-redhat-linux-gnu Thread model: posix InstalledDir: /home/fedora/src/llvm-project/main/build-RelWithDebInfo/bin System configuration file directory: /etc/clang/ Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/15 Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/15 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Selected multilib: .;@m64 ``` >From 8509a3cacfd59e262a3c5cb71cf3b8d171cf71c9 Mon Sep 17 00:00:00 2001 From: Konrad Kleine <[email protected]> Date: Fri, 31 Oct 2025 17:13:18 +0000 Subject: [PATCH] Bing --gcc-triple to flang When there are multiple gcc versions installed, we want `flang` to be able to find the right one based on the triple. Here's `flang` selecting an unwanted `gcc` candidate installation, namely `/usr/lib/gcc/x86_64-linux-gnu/15`: ``` ~/src/llvm-project/main/build-RelWithDebInfo > ./bin/flang -v flang version 22.0.0custombuild Target: x86_64-redhat-linux-gnu Thread model: posix InstalledDir: /home/fedora/src/llvm-project/main/build-RelWithDebInfo/bin System configuration file directory: /etc/clang/ Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/15 Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/15 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/15 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Selected multilib: .;@m64 ``` When passing `--gcc-triple=x86_64-redhat-linux` we get the desired gcc candidate installation: ``` ~/src/llvm-project/main/build-RelWithDebInfo > ./bin/flang --gcc-triple=x86_64-redhat-linux -v flang version 22.0.0custombuild Target: x86_64-redhat-linux-gnu Thread model: posix InstalledDir: /home/fedora/src/llvm-project/main/build-RelWithDebInfo/bin System configuration file directory: /etc/clang/ Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/15 Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/15 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Selected multilib: .;@m64 ``` --- clang/include/clang/Driver/Options.td | 1 + 1 file changed, 1 insertion(+) diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td index cb5cb888c6da7..8b728e9acbb8b 100644 --- a/clang/include/clang/Driver/Options.td +++ b/clang/include/clang/Driver/Options.td @@ -741,6 +741,7 @@ def gcc_toolchain : Joined<["--"], "gcc-toolchain=">, Flags<[NoXarchOption]>, "Specify a directory where Flang can find 'lib{,32,64}/gcc{,-cross}/$triple/$version'. " "Flang will use the GCC installation with the largest version">; def gcc_triple_EQ : Joined<["--"], "gcc-triple=">, + Visibility<[ClangOption, FlangOption]>, HelpText<"Search for the GCC installation with the specified triple.">; def CC : Flag<["-"], "CC">, Visibility<[ClangOption, CC1Option]>, Group<Preprocessor_Group>, _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
