https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81775
Bug ID: 81775
Summary: GCC fails to compile: md-unwind-support.h:65
dereferencing pointer to incomplete type ‘struct
ucontext’
Product: gcc
Version: 7.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: guido at trentalancia dot com
Target Milestone: ---
GCC 7.1.0 fails to rebuild (with the same version of the compiler) because of
the following error:
/home/guido/build-gcc-7.1.0/./gcc/xgcc -B/home/guido/build-gcc-7.1.0/./gcc/
-B/usr/x86_64-pc-linux-gnu/bin/ -B/usr/x86_64-pc-linux-gnu/lib/ -isystem
/usr/x86_64-pc-linux-gnu/include -isystem /usr/x86_64-pc-linux-gnu/sys-include
-g -O2 -O3 -march=nehalem -mtune=nehalem -O2 -g -O2 -O3 -march=nehalem
-mtune=nehalem -DIN_GCC -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wno-format -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-isystem ./include -fpic -mlong-double-80 -DUSE_ELF_SYMVER -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector -fpic -mlong-double-80
-DUSE_ELF_SYMVER -I. -I. -I../.././gcc -I../../../gcc-7.1.0/libgcc
-I../../../gcc-7.1.0/libgcc/. -I../../../gcc-7.1.0/libgcc/../gcc
-I../../../gcc-7.1.0/libgcc/../include
-I../../../gcc-7.1.0/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS -DUSE_TLS -o unwind-dw2-fde-dip.o -MT unwind-dw2-fde-dip.o -MD
-MP -MF unwind-dw2-fde-dip.dep -fexceptions -c
../../../gcc-7.1.0/libgcc/unwind-dw2-fde-dip.c -fvisibility=hidden
-DHIDE_EXPORTS
/home/guido/build-gcc-7.1.0/./gcc/xgcc -B/home/guido/build-gcc-7.1.0/./gcc/
-B/usr/x86_64-pc-linux-gnu/bin/ -B/usr/x86_64-pc-linux-gnu/lib/ -isystem
/usr/x86_64-pc-linux-gnu/include -isystem /usr/x86_64-pc-linux-gnu/sys-include
-g -O2 -O3 -march=nehalem -mtune=nehalem -O2 -g -O2 -O3 -march=nehalem
-mtune=nehalem -DIN_GCC -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wno-format -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-isystem ./include -fpic -mlong-double-80 -DUSE_ELF_SYMVER -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector -fpic -mlong-double-80
-DUSE_ELF_SYMVER -I. -I. -I../.././gcc -I../../../gcc-7.1.0/libgcc
-I../../../gcc-7.1.0/libgcc/. -I../../../gcc-7.1.0/libgcc/../gcc
-I../../../gcc-7.1.0/libgcc/../include
-I../../../gcc-7.1.0/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS -DUSE_TLS -o unwind-sjlj.o -MT unwind-sjlj.o -MD -MP -MF
unwind-sjlj.dep -fexceptions -c ../../../gcc-7.1.0/libgcc/unwind-sjlj.c
-fvisibility=hidden -DHIDE_EXPORTS
In file included from ../../../gcc-7.1.0/libgcc/unwind-dw2.c:403:0:
./md-unwind-support.h: In function ‘x86_64_fallback_frame_state’:
./md-unwind-support.h:65:47: error: dereferencing pointer to incomplete type
‘struct ucontext’
sc = (struct sigcontext *) (void *) &uc_->uc_mcontext;
^~
make[3]: *** [../../../gcc-7.1.0/libgcc/shared-object.mk:14: unwind-dw2.o]
Error 1
make[3]: exiting from directory
"/home/guido/build-gcc-7.1.0/x86_64-pc-linux-gnu/libgcc"
