From dab7ba34f87be0172f6586325656ee962de0029e Mon Sep 17 00:00:00 2001
From: Philip Lorenz <philip.lorenz@bmw.de>
Date: Mon, 3 Jun 2024 13:19:24 +0200
Subject: [PATCH] CMakeDetermineCompilerABI: Strip -pipe from compile flags

When `-pipe` is enabled, GCC passes data between its different
executables using pipes instead of temporary files. This leads to issues
when cmake attempts to infer compiler internals via the `-v` parameter
as each executable will print to `stderr` in parallel.

For example we have observed the following outputs in our builds which
sporadically lead to build failures as system include directories were
not detected reliably:

Parsed CXX implicit include dir info from above output: rv=done
  found start of include info
  found start of implicit include info
    add: [.../usr/bin/x86_64-poky-linux/../../lib/x86_64-poky-linux/gcc/x86_64-poky-linux/11.4.0/include]
    add: [.../usr/bin/x86_64-poky-linux/../../lib/x86_64-poky-linux/gcc/x86_64-poky-linux/11.4.0/include-fixed]
    add: [.../usr/include/c++/11.4.0]
    add: [.../usr/include/c++/11.4.0/x86_64-poky-linux]
    add: [.../usr/include/c++/11.4.0/backward]
    add: [.../usr/lib/x86_64-poky-linux/11.4.0/include]
    add: [...GNU assembler version 2.38 (x86_64-poky-linux) using BFD version (GNU Binutils) 2.38.20220708]
    add: [/usr/include]
  end of search list found

Fix this issue by stripping the `-pipe` parameter from the compilation
flag when determining the toolchain configuration.

Upstream-Status: Backport [3.32.0, 71be059f3f32b6791427893a48ba4815a19e2e78]
Signed-off-by: Philip Lorenz <philip.lorenz@bmw.de>
---
 Modules/CMakeDetermineCompilerABI.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Modules/CMakeDetermineCompilerABI.cmake b/Modules/CMakeDetermineCompilerABI.cmake
index 8191d819bf..ae4c9ee44e 100644
--- a/Modules/CMakeDetermineCompilerABI.cmake
+++ b/Modules/CMakeDetermineCompilerABI.cmake
@@ -35,6 +35,11 @@ function(CMAKE_DETERMINE_COMPILER_ABI lang src)
 
     # Avoid failing ABI detection on warnings.
     string(REGEX REPLACE "(^| )-Werror([= ][^ ]*)?( |$)" " " CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS}")
+    # Avoid passing of "-pipe" when determining the compiler internals. With
+    # "-pipe" GCC will use pipes to pass data between the involved
+    # executables.  This may lead to issues when their stderr output (which
+    # contains the relevant compiler internals) becomes interweaved.
+    string(REGEX REPLACE "(^| )-pipe( |$)" " " CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS}")
 
     # Save the current LC_ALL, LC_MESSAGES, and LANG environment variables
     # and set them to "C" that way GCC's "search starts here" text is in
