[PATCH 1/2] build: -no-pie is no functional linker flag

[Denis V. Lunev]

From: Christian Ehrhardt <christian.ehrhardt@canonical.com>

Recent binutils changes dropping unsupported options [1] caused a build
issue in regard to the optionroms.

  ld -m elf_i386 -T /<<PKGBUILDDIR>>/pc-bios/optionrom//flat.lds -no-pie \
    -s -o multiboot.img multiboot.o
  ld.bfd: Error: unable to disambiguate: -no-pie (did you mean --no-pie ?)

This isn't really a regression in ld.bfd, filing the bug upstream
revealed that this never worked as a ld flag [2] - in fact it seems we
were by accident setting --nmagic).

Since it never had the wanted effect this usage of LDFLAGS_NOPIE, should be
droppable without any effect. This also is the only use-case of LDFLAGS_NOPIE
in .mak, therefore we can also remove it from being added there.

[1]: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=983d925d
[2]: https://sourceware.org/bugzilla/show_bug.cgi?id=27050#c5

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Message-Id: <20201214150938.1297512-1-christian.ehrhardt@canonical.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
Going to put this patch at the beginning of our branch. This fixes
compilation on my Ubuntu 20.04.

 configure                  | 3 ---
 pc-bios/optionrom/Makefile | 1 -
 2 files changed, 4 deletions(-)

diff --git a/configure b/configure
index b29aa04a6e..2c8384cb50 100755
--- a/configure
+++ b/configure
@@ -2121,7 +2121,6 @@ EOF
 # Check we support --no-pie first; we will need this for building ROMs.
 if compile_prog "-Werror -fno-pie" "-no-pie"; then
   CFLAGS_NOPIE="-fno-pie"
-  LDFLAGS_NOPIE="-no-pie"
 fi
 
 if test "$static" = "yes"; then
@@ -2137,7 +2136,6 @@ if test "$static" = "yes"; then
   fi
 elif test "$pie" = "no"; then
   CONFIGURE_CFLAGS="$CFLAGS_NOPIE $CONFIGURE_CFLAGS"
-  CONFIGURE_LDFLAGS="$LDFLAGS_NOPIE $CONFIGURE_LDFLAGS"
 elif compile_prog "-Werror -fPIE -DPIE" "-pie"; then
   CONFIGURE_CFLAGS="-fPIE -DPIE $CONFIGURE_CFLAGS"
   CONFIGURE_LDFLAGS="-pie $CONFIGURE_LDFLAGS"
@@ -6756,7 +6754,6 @@ echo "QEMU_CXXFLAGS=$QEMU_CXXFLAGS" >> $config_host_mak
 echo "GLIB_CFLAGS=$glib_cflags" >> $config_host_mak
 echo "GLIB_LIBS=$glib_libs" >> $config_host_mak
 echo "QEMU_LDFLAGS=$QEMU_LDFLAGS" >> $config_host_mak
-echo "LDFLAGS_NOPIE=$LDFLAGS_NOPIE" >> $config_host_mak
 echo "LD_I386_EMULATION=$ld_i386_emulation" >> $config_host_mak
 echo "EXESUF=$EXESUF" >> $config_host_mak
 echo "HOST_DSOSUF=$HOST_DSOSUF" >> $config_host_mak
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index 084fc10f05..30771f8d17 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -41,7 +41,6 @@ override CFLAGS += $(call cc-option, $(Wa)-32)
 
 LD_I386_EMULATION ?= elf_i386
 override LDFLAGS = -m $(LD_I386_EMULATION) -T $(SRC_DIR)/flat.lds
-override LDFLAGS += $(LDFLAGS_NOPIE)
 
 all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin pvh.bin
 
-- 
2.30.2