/********************************************************************** * elfutils cc1: all warnings being treated as errors * 说明： * 在Ubuntu 18.04上编译Yocto，elfutils的Makefile中出现没有识别到一些配置， * 需要在Makefile中去掉-Werror选项。 * * 2018-6-14 深圳 宝安西乡 曾剑锋 *********************************************************************/ 一、参考文档： 1. How to compile without warnings being treated as errors? https://stackoverflow.com/questions/11561261/how-to-compile-without-warnings-being-treated-as-errors 2. all warnings being treated as errors https://wizardforcel.gitbooks.io/100-gcc-tips/content/warnings-treated-as-errors.html 二、报错现象： 1. 现象： x86_64-linux/usr/include -O2 -pipe -c -o dwfl_report_elf.o ../../elfutils-0.164/libdwfl/dwfl_report_elf.c | ../../elfutils-0.164/libdwfl/dwfl_report_elf.c: In function '__libdwfl_elf_address_range': | ../../elfutils-0.164/libdwfl/dwfl_report_elf.c:172:19: error: this statement may fall through [-Werror=implicit-fallthrough=] | add_p_vaddr = true; | ^ | ../../elfutils-0.164/libdwfl/dwfl_report_elf.c:174:5: note: here | case ET_DYN: | ^~~~ | cc1: all warnings being treated as errors | Makefile:576: recipe for target 'dwfl_report_elf.o' failed 2. 现象： imx6q-x11/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -c -o dwarf_next_cfi.o ../../elfutils-0.164/libdw/dwarf_next_cfi.c | In file included from ../../elfutils-0.164/libdw/dwarf_next_cfi.c:34:0: | ../../elfutils-0.164/libdw/encoded-value.h: In function 'encoded_value_size': | ../../elfutils-0.164/libdw/encoded-value.h:60:10: error: this statement may fall through [-Werror=implicit-fallthrough=] | if (p != NULL) | ^ | ../../elfutils-0.164/libdw/encoded-value.h:68:5: note: here | default: | ^~~~~~~ | cc1: all warnings being treated as errors | Makefile:708: recipe for target 'dwarf_next_cfi.o' failed | make[3]: *** [dwarf_next_cfi.o] Error 1 3. 现象： inux/usr/include -O2 -pipe -c -o i386_disasm.o ../../elfutils-0.164/libcpu/i386_disasm.c | ../../elfutils-0.164/libcpu/i386_disasm.c: In function 'i386_disasm': | ../../elfutils-0.164/libcpu/i386_disasm.c:789:9: error: this statement may fall through [-Werror=implicit-fallthrough=] | if (data[1] == 0xc2) | ^ | ../../elfutils-0.164/libcpu/i386_disasm.c:823:4: note: here | default: | ^~~~~~~ | cc1: all warnings being treated as errors | Makefile:441: recipe for target 'i386_disasm.o' failed 三、解决方法： 1. 原因： cc1: all warnings being treated as errors 2. 修改对应的Makefile，去掉-Werror： 3. 手动处理示例： /home/zengjf/zengjf/fsl-release-bsp/imx6q-x11/tmp/work/x86_64-linux/elfutils-native/0.164-r0/build/libdwfl/Makefile [...省略] # Warn about stack usage of more than 256K = 262144 bytes. STACK_USAGE_WARNING = -Wstack-usage=262144 AM_CFLAGS = -std=gnu99 -Wall -Wshadow -Wformat=2 -Wold-style-definition -Wstrict-prototypes $(if $($(*F)_no_Werror),,-Werror) # remove this line $(if $($(*F)_no_Wunused),,-Wunused -Wextra) $(if $($(*F)_no_Wstack_usage),,$(STACK_USAGE_WARNING)) $($(*F)_CFLAGS) [...省略] 4. 获取Makefile生成信息： zengjf@zengjf:~/zengjf/fsl-release-bsp/imx6q-x11/tmp/work/x86_64-linux/elfutils-native/0.164-r0$ grep _no_Werror * -r build/tests/Makefile: $(if $($(*F)_no_Werror),,-Werror) build/libdwfl/Makefile.bak: $(if $($(*F)_no_Werror),,-Werror) build/backends/Makefile: $(if $($(*F)_no_Werror),,-Werror) build/libdwelf/Makefile: $(if $($(*F)_no_Werror),,-Werror) build/lib/Makefile: $($(*F)_no_Werror),,-Werror) $(if build/libasm/Makefile: $(if $($(*F)_no_Werror),,-Werror) build/libelf/Makefile: $($(*F)_no_Werror),,-Werror) $(if build/libebl/Makefile: $($(*F)_no_Werror),,-Werror) $(if build/src/Makefile: $(if $($(*F)_no_Werror),,-Werror) build/src/Makefile:ldlex_no_Werror = yes build/libcpu/Makefile:i386_lex_no_Werror = yes elfutils-0.164/tests/Makefile.in: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/libdwfl/Makefile.in: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/backends/Makefile.in: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/config/eu.am: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/libdwelf/Makefile.in: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/libdw/Makefile.in: $($(*F)_no_Werror),,-Werror) $(if elfutils-0.164/lib/Makefile.in: $($(*F)_no_Werror),,-Werror) $(if elfutils-0.164/libasm/Makefile.in: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/libelf/Makefile.in: $($(*F)_no_Werror),,-Werror) $(if elfutils-0.164/libebl/Makefile.in: $($(*F)_no_Werror),,-Werror) $(if elfutils-0.164/src/Makefile.in: $(if $($(*F)_no_Werror),,-Werror) elfutils-0.164/src/Makefile.in:ldlex_no_Werror = yes elfutils-0.164/src/Makefile.am:ldlex_no_Werror = yes elfutils-0.164/libcpu/Makefile.in: $($(*F)_no_Werror),,-Werror) $(if elfutils-0.164/libcpu/Makefile.in:i386_lex_no_Werror = yes elfutils-0.164/libcpu/Makefile.am:i386_lex_no_Werror = yes elfutils-0.164/.pc/dso-link-change.patch/src/Makefile.am:ldlex_no_Werror = yes elfutils-0.164/.pc/uclibc-support.patch/libcpu/Makefile.am:i386_lex_no_Werror = yes zengjf@zengjf:~/zengjf/fsl-release-bsp/imx6q-x11/tmp/work/x86_64-linux/elfutils-native/0.164-r0$ 5. 一个一个文件修改比较麻烦，依据第4点，修改对应的yes为no就可以比较快捷的一次性全部解决问题，然而实际情况是没有识别到ldlex和i386_lex，乖乖的手动删除或者制作Shell脚本处理； 6. 自动化shell命令： 1. grep _no_Werror) * -r | cut -d":" -f1 | xargs sed -i "s/[$](if [$]([$]([*F]*)_no_Werror),,-Werror)//" 2. grep _no_Werror) * -r | cut -d":" -f1 | xargs sed -i "s/[$]([$]([*F]*)_no_Werror),,-Werror) [$](if//"