build: -no-pie is no functional linker flag

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>

diff --git a/configure b/configure
index 2acc4d1465f8165ae3a238784231a1c50d3b0d4f..71778ec414e7dc01c0d634b91f15dad903bb2b4d 100755 (executable)
--- a/configure
+++ b/configure
@@ -2184,7 +2184,6 @@ 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 "$static" = "yes"; then
@@ -2200,7 +2199,6 @@ if test "$static" = "yes"; then
   fi
 elif test "$pie" = "no"; then
   QEMU_CFLAGS="$CFLAGS_NOPIE $QEMU_CFLAGS"
-  QEMU_LDFLAGS="$LDFLAGS_NOPIE $QEMU_LDFLAGS"
 elif compile_prog "-Werror -fPIE -DPIE" "-pie"; then
   QEMU_CFLAGS="-fPIE -DPIE $QEMU_CFLAGS"
   QEMU_LDFLAGS="-pie $QEMU_LDFLAGS"
@@ -7996,7 +7994,6 @@ if test "$sparse" = "yes" ; then
   echo "QEMU_CFLAGS  += -Wbitwise -Wno-transparent-union -Wno-old-initializer -Wno-non-pointer-null" >> $config_host_mak
 fi
 echo "QEMU_LDFLAGS=$QEMU_LDFLAGS" >> $config_host_mak
-echo "LDFLAGS_NOPIE=$LDFLAGS_NOPIE" >> $config_host_mak
 echo "LD_REL_FLAGS=$LD_REL_FLAGS" >> $config_host_mak
 echo "LD_I386_EMULATION=$ld_i386_emulation" >> $config_host_mak
 echo "LIBS+=$LIBS" >> $config_host_mak

diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index e33a24da0d0ca125aef84351a4a689726d482056..bbb57ee138c05d05b58d50cb2680ab49327ad222 100644 (file)
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -47,10 +47,10 @@ build-all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin pvh.bin
        $(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_DGFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@,"AS","$(TARGET_DIR)$@")
 
 pvh.img: pvh.o pvh_main.o
-       $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m $(LD_I386_EMULATION) -T $(SRC_PATH)/pc-bios/optionrom/flat.lds -s -o $@ $^,"BUILD","$(TARGET_DIR)$@")
+       $(call quiet-command,$(LD) -m $(LD_I386_EMULATION) -T $(SRC_PATH)/pc-bios/optionrom/flat.lds -s -o $@ $^,"BUILD","$(TARGET_DIR)$@")
 
 %.img: %.o
-       $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m $(LD_I386_EMULATION) -T $(SRC_PATH)/pc-bios/optionrom/flat.lds -s -o $@ $<,"BUILD","$(TARGET_DIR)$@")
+       $(call quiet-command,$(LD) -m $(LD_I386_EMULATION) -T $(SRC_PATH)/pc-bios/optionrom/flat.lds -s -o $@ $<,"BUILD","$(TARGET_DIR)$@")
 
 %.raw: %.img
        $(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@,"BUILD","$(TARGET_DIR)$@")