Public bug reported:
altos 1.9.22-3 fails to build from source on amd64v3 in stonking-proposed:
https://launchpad.net/ubuntu/+source/altos/1.9.22-3/+build/32844204
Build log:
https://launchpadlibrarian.net/878710979/buildlog_ubuntu-stonking-amd64v3.altos_1.9.22-3_BUILDING.txt.gz
dh_install aborts because no firmware images were built:
dh_install: warning: altos missing files: src/*/*.ihx
dh_install: error: missing files, aborting
Root cause: configure decides the ARM cross compiler is unusable:
checking if arm-none-eabi-gcc supports cortex-m0... no
checking if arm-none-eabi-gcc supports cortex-m3... no
configure: WARNING: No cortex-m3 arm compiler found, STM32L binaries will not
be built
configure: WARNING: No cortex-m0 arm compiler found, LPC11U14 and STM32F0
binaries will not be built
The cortex-m0/m3 probes in configure.ac (around line 278) override
CFLAGS with -mthumb -mcpu=cortex-m*, but keep the host CPPFLAGS and
LDFLAGS. On amd64v3, dpkg-buildflags adds -march=x86-64-v3 to LDFLAGS as
well (needed for the LTO link step). AC_LINK_IFELSE therefore runs arm-
none-eabi-gcc with -march=x86-64-v3, which it rejects, so both probes
fail and the whole firmware build is skipped. Plain amd64 builds are
unaffected because their LDFLAGS carry no -march.
The firmware build itself is not affected: src/stm/Makefile.defs sets
its own LDFLAGS.
Proposed fix (quilt patch; applies cleanly to 1.9.22, not yet build-
tested):
Description: Don't pass host CPPFLAGS/LDFLAGS to the ARM compiler probes
The cortex-m0/m3 checks override CFLAGS but inherit the host LDFLAGS and
CPPFLAGS. On amd64v3 (and any build using -march in LDFLAGS for LTO)
these contain -march=x86-64-v3, which arm-none-eabi-gcc rejects, so the
probes fail and no firmware (*.ihx) is built, making dh_install fail.
Author: OpenCode
Forwarded: no
--- a/configure.ac
+++ b/configure.ac
@@ -278,9 +278,13 @@
if test "x$HAVE_ARM_CC" = "xyes"; then
save_CC="$CC"
save_CFLAGS="$CFLAGS"
+ save_CPPFLAGS="$CPPFLAGS"
+ save_LDFLAGS="$LDFLAGS"
save_LIBS="$LIBS"
CC="$ARM_CC"
CFLAGS="-mthumb -mcpu=cortex-m0"
+ CPPFLAGS=""
+ LDFLAGS=""
LIBS="--specs=picolibc.specs"
AC_LANG_PUSH([C])
@@ -300,6 +304,8 @@
AC_LANG_POP([C])
LIBS="$save_LIBS"
CFLAGS="$save_CFLAGS"
+ CPPFLAGS="$save_CPPFLAGS"
+ LDFLAGS="$save_LDFLAGS"
CC="$save_CC"
else
HAVE_ARM_M3_CC=no
Alternative: strip -march=% from LDFLAGS in debian/rules before
configure. This should also be forwarded to Debian/upstream, since any
architecture with -march in the default LDFLAGS is affected.
** Affects: altos (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2168943
Title:
altos FTBFS on amd64v3: ARM compiler probes pick up host -march from
LDFLAGS, no firmware built
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