Hi Lianbo and Luc, I rolled back my patch and tried to cross-compile, and got the following result: $ make CROSS_COMPILE=aarch64-linux-gnu- extensions gcc -Wall -g -shared -rdynamic -o dminfo.so dminfo.c -fPIC -DARM64 -DGDB_16_2 gcc -Wall -g -shared -rdynamic -o echo.so echo.c -fPIC -DARM64 -DGDB_16_2 Cloning into 'eppic'... remote: Enumerating objects: 700, done. remote: Counting objects: 100% (219/219), done. remote: Compressing objects: 100% (90/90), done. remote: Total 700 (delta 156), reused 170 (delta 127), pack-reused 481 (from 1) Receiving objects: 100% (700/700), 317.20 KiB | 202.00 KiB/s, done. Resolving deltas: 100% (378/378), done. cd eppic/libeppic && make bison -peppic -v -t -d eppic.y eppic.y: warning: 135 shift/reduce conflicts [-Wconflicts-sr] eppic.y: warning: 22 reduce/reduce conflicts [-Wconflicts-rr] eppic.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_util.o eppic_util.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_node.o eppic_node.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_var.o eppic_var.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_func.o eppic_func.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_str.o eppic_str.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_op.o eppic_op.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_num.o eppic_num.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_stat.o eppic_stat.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_builtin.o eppic_builtin.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_type.o eppic_type.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_case.o eppic_case.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_api.o eppic_api.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_member.o eppic_member.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_alloc.o eppic_alloc.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_define.o eppic_define.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_input.o eppic_input.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_print.o eppic_print.c bison -peppicpp -v -t -d eppicpp.y eppicpp.y: warning: 23 shift/reduce conflicts [-Wconflicts-sr] eppicpp.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples cc -g -O0 -fno-omit-frame-pointer -fPIC -c eppicpp.tab.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c eppic.tab.c flex -L -Peppic -t eppic.l > lex.eppic.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c lex.eppic.c flex -Peppicpp -t eppicpp.l > lex.eppicpp.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c lex.eppicpp.c cc -g -O0 -fno-omit-frame-pointer -fPIC -o mkbaseop mkbaseop.c ./mkbaseop > baseops.c cc -g -O0 -fno-omit-frame-pointer -fPIC -c baseops.c ar cur libeppic.a eppic_util.o eppic_node.o eppic_var.o eppic_func.o eppic_str.o eppic_op.o eppic_num.o eppic_stat.o eppic_builtin.o eppic_type.o eppic_case.o eppic_api.o eppic_member.o eppic_alloc.o eppic_define.o eppic_input.o eppic_print.o eppicpp.tab.o eppic.tab.o lex.eppic.o lex.eppicpp.o baseops.o ar: `u' modifier ignored since `D' is the default (see `U') gcc -g -O0 -Ieppic/libeppic -I.. -nostartfiles -shared -rdynamic -o eppic.so eppic/applications/crash/eppic.c -fPIC -DARM64 -DGDB_16_2 -Leppic/libeppic -leppic gcc -Wall -g -I. -shared -rdynamic -o snap.so snap.c -fPIC -DARM64 -DGDB_16_2 It succeeded, but that's not cross-compiling. It still uses gcc to compile all extensions. When I applied my patch, I passed $(CC) to the extensions Makefile from the top Makefile. This caused the eppic extension to actually use aarch64-linux-gnu-gcc for cross-compilation. However, it doesn't seem to support cross-compilation. If I understand correctly, I think we can fix this error by changing the call of $(CC) in the eppic extension to gcc. If you agree with this proposal, I will submit a patch to the eppic repository to fix it. Thanks Jianyun On Fri, Oct 10, 2025 at 11:33 AM lijiang <lijiang(a)redhat.com&gt; wrote: > > Hi, Jianyun > Thank you for the patch. > > On Fri, Sep 26, 2025 at 7:27 AM <devel-request(a)lists.crash-utility.osci.io&gt; wrote: >> >> Date: Tue, 23 Sep 2025 21:43:38 +0800 >> From: 高建云 <jianyungao89(a)gmail.com&gt; >> Subject: [Crash-utility] [PATCH] Optimize extensions's compiler from >> gcc to $(CC) >> To: devel(a)lists.crash-utility.osci.io >> Message-ID: >> <CAHP3+4CZqDNh5LV5DgY0HLfB_MQPqAU0PzoZZTfk9Kfvz+BHJA(a)mail.gmail.com&gt; >> Content-Type: multipart/alternative; >> boundary="00000000000043dcaa063f782098" >> >> --00000000000043dcaa063f782098 >> Content-Type: text/plain; charset="UTF-8" >> >> Change the default compiler of the extensions from the fixed gcc >> to $(CC) passed in by the upper layer Makefile, >> to facilitate cross_compile. >> >> Signed-off-by: jianyun.gao <jianyungao89(a)gmail.com&gt; >> --- >> Makefile | 2 +- >> extensions/Makefile | 10 +++++----- >> 2 files changed, 6 insertions(+), 6 deletions(-) >> > > I tried the patch, and this caused the following failure, can you help double check? > > $ make CROSS_COMPILE=aarch64-linux-gnu- extensions > aarch64-linux-gnu-gcc -Wall -g -shared -rdynamic -o dminfo.so dminfo.c -fPIC -DARM64 -DGDB_16_2 > aarch64-linux-gnu-gcc -Wall -g -shared -rdynamic -o echo.so echo.c -fPIC -DARM64 -DGDB_16_2 > Cloning into 'eppic'... > remote: Enumerating objects: 691, done. > remote: Counting objects: 100% (210/210), done. > remote: Compressing objects: 100% (84/84), done. > remote: Total 691 (delta 150), reused 165 (delta 124), pack-reused 481 (from 1) > Receiving objects: 100% (691/691), 318.81 KiB | 312.00 KiB/s, done. > Resolving deltas: 100% (372/372), done. > cd eppic/libeppic && make > bison -peppic -v -t -d eppic.y > eppic.y: warning: 135 shift/reduce conflicts [-Wconflicts-sr] > eppic.y: warning: 22 reduce/reduce conflicts [-Wconflicts-rr] > eppic.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_util.o eppic_util.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_node.o eppic_node.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_var.o eppic_var.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_func.o eppic_func.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_str.o eppic_str.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_op.o eppic_op.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_num.o eppic_num.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_stat.o eppic_stat.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_builtin.o eppic_builtin.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_type.o eppic_type.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_case.o eppic_case.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_api.o eppic_api.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_member.o eppic_member.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_alloc.o eppic_alloc.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_define.o eppic_define.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_input.o eppic_input.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c -o eppic_print.o eppic_print.c > bison -peppicpp -v -t -d eppicpp.y > eppicpp.y: warning: 23 shift/reduce conflicts [-Wconflicts-sr] > eppicpp.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c eppicpp.tab.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c eppic.tab.c > flex -L -Peppic -t eppic.l > lex.eppic.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c lex.eppic.c > flex -Peppicpp -t eppicpp.l > lex.eppicpp.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c lex.eppicpp.c > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -o mkbaseop mkbaseop.c > ./mkbaseop > baseops.c > /bin/sh: 1: ./mkbaseop: Exec format error > make[5]: [Makefile:71: baseops.o] Error 126 (ignored) > aarch64-linux-gnu-gcc -g -O0 -fno-omit-frame-pointer -fPIC -c baseops.c > ar cur libeppic.a eppic_util.o eppic_node.o eppic_var.o eppic_func.o eppic_str.o eppic_op.o eppic_num.o eppic_stat.o eppic_builtin.o eppic_type.o eppic_case.o eppic_api.o eppic_member.o eppic_alloc.o eppic_define.o eppic_input.o eppic_print.o eppicpp.tab.o eppic.tab.o lex.eppic.o lex.eppicpp.o baseops.o > ar: `u' modifier ignored since `D' is the default (see `U') > gcc -g -O0 -Ieppic/libeppic -I.. -nostartfiles -shared -rdynamic -o eppic.so eppic/applications/crash/eppic.c -fPIC -DARM64 -DGDB_16_2 -Leppic/libeppic -leppic > /usr/bin/ld: skipping incompatible eppic/libeppic/libeppic.a when searching for -leppic > /usr/bin/ld: cannot find -leppic: No such file or directory > collect2: error: ld returned 1 exit status > make[4]: [eppic.mk:71: eppic.so] Error 1 (ignored) > gcc -Wall -g -I. -shared -rdynamic -o snap.so snap.c -fPIC -DARM64 -DGDB_16_2 > > But for the trace and gcore, etc. It can work. > > Thanks > Lianbo > >> >> diff --git a/Makefile b/Makefile >> index b277129..58b1326 100644 >> --- a/Makefile >> +++ b/Makefile >> @@ -727,7 +727,7 @@ extensions: make_configure >> @$(MAKE) do_extensions >> >> do_extensions: >> - @$(MAKE) -C extensions -i TARGET=$(TARGET) TARGET_CFLAGS="$(CFLAGS) >> $(TARGET_CFLAGS)" GDB=$(GDB) GDB_FLAGS=$(GDB_FLAGS) >> + @$(MAKE) -C extensions -i CC=$(CC) TARGET=$(TARGET) >> TARGET_CFLAGS="$(CFLAGS) $(TARGET_CFLAGS)" GDB=$(GDB) GDB_FLAGS=$(GDB_FLAGS) >> >> memory_driver: make_configure >> @$(MAKE) -C memory_driver -i >> diff --git a/extensions/Makefile b/extensions/Makefile >> index e4c68c3..67d3839 100644 >> --- a/extensions/Makefile >> +++ b/extensions/Makefile >> @@ -23,7 +23,7 @@ >> # suffice, create a .mk file with the same prefix as the .c file, >> # and that makefile will be invoked. >> # >> - >> +CC ?= gcc >> CONTRIB_SO := $(patsubst %.c,%.so,$(wildcard *.c)) >> >> all: link_defs $(CONTRIB_SO) >> @@ -37,11 +37,11 @@ $(CONTRIB_SO): %.so: %.c defs.h >> $(MAKE) -f $*.mk; \ >> else \ >> grep -q '((constructor))' $*.c && { \ >> - echo "gcc -Wall -g -shared -rdynamic -o $@ $*.c -fPIC >> -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ >> - gcc -Wall -g -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) >> $(TARGET_CFLAGS) $(GDB_FLAGS); \ >> + echo "$(CC) -Wall -g -shared -rdynamic -o $@ $*.c -fPIC >> -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ >> + $(CC) -Wall -g -shared -rdynamic -o $@ $*.c -fPIC -D$(TARGET) >> $(TARGET_CFLAGS) $(GDB_FLAGS); \ >> } || { \ >> - echo "gcc -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c >> -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ >> - gcc -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c -fPIC >> -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS); \ >> + echo "$(CC) -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c >> -fPIC -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS)"; \ >> + $(CC) -Wall -g -nostartfiles -shared -rdynamic -o $@ $*.c -fPIC >> -D$(TARGET) $(TARGET_CFLAGS) $(GDB_FLAGS); \ >> }; \ >> fi >> >> -- >> 2.34.1 >>