> One way to solve this would be to set DEB_BUILD_OPTIONS=optimize=-lto, to > exclude the LTO flags specifically so that they don't leak into the target > builds. Another thought I had was to use the dpkg-buildflags for armhf as a > target architecture, since there could be other per-arch flags in the future > that cause further problems. I've tried the latter approach in the attached > patch, which fixes the problem of lto being incorrectly used for the > arm-none-eabi target. I've verified that the resulting libstdc++ is usable > again with this change.
Yeah, neither of these is really appropriate; we're not building Debian
code here. As 'rules' already sets the complete CFLAGS and CXXFLAGS
values save the necessary flags for a reproducible build, how about I
just add `-ffile-prefix-map=$(TOP_DIR)=.` manually and stop using
/usr/share/dpkg/buildflags.mk?
@@ -10,7 +10,6 @@ MULTILIB_LIST="--with-multilib-list=rmprofile"
GCC_PACKAGE=gcc-arm-none-eabi
include /usr/share/dpkg/pkg-info.mk
-include /usr/share/dpkg/buildflags.mk
SVERSION := $(shell dpkg-query -W -f="\$${Version}\n" $(GCC_PACKAGE)-source)
DVERSION := $(SVERSION)+$(DEB_VERSION)
@@ -29,6 +28,9 @@
BUILD_PICOLIBC_RELEASE_DIR=$(TOP_DIR)/build_picolibc_release/libstdc++
PNEWLIB=libstdc\+\+-arm-none-eabi-newlib
PPICOLIBC=libstdc\+\+-arm-none-eabi-picolibc
+CFLAGS := -ffile-prefix-map=$(TOP_DIR)=. -Wformat -Werror=format-security
+CXXFLAGS := $(CFLAGS)
+
BUILDFLAGS=CFLAGS="$(CFLAGS) -g -O2 -ffunction-sections -fdata-sections"
CXXFLAGS="$(CXXFLAGS) -g -O2 -ffunction-sections -fdata-sections"
LDFLAGS="$(LDFLAGS)"
BUILDFLAGS_NANO=CFLAGS="$(CFLAGS) -g -Os -ffunction-sections -fdata-sections
-fno-exceptions" CXXFLAGS="$(CXXFLAGS) -g -Os -ffunction-sections
-fdata-sections -fno-exceptions" LDFLAGS="$(LDFLAGS)"
BUILDFLAGS_PICOLIBC=CFLAGS="--specs=picolibc.specs $(CFLAGS) -g -Os
-ffunction-sections -fdata-sections" CXXFLAGS="--specs=picolibcpp.specs
$(CXXFLAGS) -g -Os -ffunction-sections -fdata-sections"
LDFLAGS="--specs=picolibc.specs $(LDFLAGS)"
--
-keith
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