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putchar and putchar_unlocked have different scope ?




Trying to build gcc-6.3.0-2 with its source package on
cygwin  2.9.0-0.2


x86_64-pc-cygwin-g++ -std=gnu++98 -c -g -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-format -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -DGENERATOR_FILE -fno-PIE -I. -Ibuild -I/cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc -I/cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/build -I/cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/../include -I/cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/../libcpp/include \ -o build/genchecksum.o /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/genchecksum.c
echo "      return Relocate_Path (S0, S2);" >>tmp-sdefault.adb
echo "   end Object_Dir_Default_Name;" >>tmp-sdefault.adb
echo "   function Target_Name return String_Ptr is" >>tmp-sdefault.adb
In file included from /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/system.h:46:0, from /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/gengenrtl.c:22: /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/gengenrtl.c: In function ‘void genheader()’: /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/system.h:87:22: error: ‘_putchar_unlocked’ was not declared in this scope
 #  define putchar(C) putchar_unlocked (C)
                      ^
/cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-2.src/gcc-6.3.0-2.x86_64/src/gcc-6.3.0/gcc/gengenrtl.c:298:3: note: in expansion of macro ‘putchar’
   putchar ('\n');
   ^~~~~~~

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