Remove -pipe from default list of args. Closes #8508.

docs/markdown/snippets/nopipe.md

@@ -0,0 +1,10 @@
+## `-pipe` no longer used by default
+
+Meson used to add the `-pipe` command line argument to all compilers
+that supported it, but no longer does. If you need this, then you can
+add it manually. However note that you should not do this unless you
+have actually measured that it provides performance improvements. In
+our tests we could not find a case where adding `-pipe` made
+compilation faster and using `-pipe` [can cause sporadic build
+failures in certain
+cases](https://github.com/mesonbuild/meson/issues/8508).

mesonbuild/compilers/fortran.py

@@ -336,12 +336,6 @@ class IntelFortranCompiler(IntelGnuLikeCompiler, FortranCompiler):
     def get_preprocess_only_args(self) -> T.List[str]:
         return ['-cpp', '-EP']
 
-    def get_always_args(self) -> T.List[str]:
-        """Ifort doesn't have -pipe."""
-        val = super().get_always_args()
-        val.remove('-pipe')
-        return val
-
     def language_stdlib_only_link_flags(self) -> T.List[str]:
         return ['-lifcore', '-limf']
 

mesonbuild/compilers/mixins/clike.py

@@ -155,7 +155,7 @@ class CLikeCompiler(Compiler):
         '''
         Args that are always-on for all C compilers other than MSVC
         '''
-        return ['-pipe'] + self.get_largefile_args()
+        return self.get_largefile_args()
 
     def get_no_stdinc_args(self) -> T.List[str]:
         return ['-nostdinc']

mesonbuild/interpreter.py

@@ -4716,9 +4716,6 @@ This warning will become a hard error in a future Meson release.
             elif arg == '-g':
                 mlog.warning(f'Consider using the built-in debug option instead of using "{arg}".',
                              location=self.current_node)
-            elif arg == '-pipe':
-                mlog.warning("You don't need to add -pipe, Meson will use it automatically when it is available.",
-                             location=self.current_node)
             elif arg.startswith('-fsanitize'):
                 mlog.warning(f'Consider using the built-in option for sanitizers instead of using "{arg}".',
                              location=self.current_node)