Re: [PATCH] Optimize extensions's compiler from gcc to $(CC)

Thursday, 9 October 2025

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
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 CAHP3+4CZqDNh5LV5DgY0HLfB_MQPqAU0PzoZZTfk9Kfvz+BHJA(a)mail.gmail.com&gt;
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 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

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