From b03fcd6818f690d168860f895bc9e8eab971d6de Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 22 May 2023 10:05:33 +0200 Subject: [PATCH] meson: move -no-pie from linker to compiler The large comment in the patch says it all; the -no-pie flag is broken and this is why it was not included in QEMU_LDFLAGS before commit a988b4c5614 ("build: move remaining compiler flag tests to meson", 2023-05-18). And some distros made things even worse, so we have to add it to the compiler command line. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1664 Signed-off-by: Paolo Bonzini --- meson.build | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/meson.build b/meson.build index 448b71ad5b..2e47608353 100644 --- a/meson.build +++ b/meson.build @@ -265,12 +265,21 @@ endif # Meson currently only handles pie as a boolean for now, so if the user # has explicitly disabled PIE we need to extend our cflags. +# +# -no-pie is supposedly a linker flag that has no effect on the compiler +# command line, but some distros, that didn't quite know what they were +# doing, made local changes to gcc's specs file that turned it into +# a compiler command-line flag. +# +# What about linker flags? For a static build, no PIE is implied by -static +# which we added above (and if it's not because of the same specs patching, +# there's nothing we can do: compilation will fail, report a bug to your +# distro and do not use --disable-pie in the meanwhile). For dynamic linking, +# instead, we can't add -no-pie because it overrides -shared: the linker then +# tries to build an executable instead of a shared library and fails. So +# don't add -no-pie anywhere and cross fingers. :( if not get_option('b_pie') - qemu_common_flags += cc.get_supported_arguments('-fno-pie') - if not get_option('prefer_static') - # No PIE is implied by -static which we added above. - qemu_ldflags += cc.get_supported_link_arguments('-no-pie') - endif + qemu_common_flags += cc.get_supported_arguments('-fno-pie', '-no-pie') endif if not get_option('stack_protector').disabled()