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Gcc -O2 vs. no mistakes

When compiling a file containing open("FILENAME", O_RDONLY);without -O2, everything is fine. But when -O2turned on, I get:

/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘open’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:44:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:45:26: error: call to ‘__open_too_many_args’ declared with attribute error: open can be called either with 2 or 3 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:42:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:60:3: error: invalid use of ‘__builtin_va_arg_pack ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘open64’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:76:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:77:28: error: call to ‘__open64_too_many_args’ declared with attribute error: open64 can be called either with 2 or 3 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:74:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:92:3: error: invalid use of ‘__builtin_va_arg_pack ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘openat’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:120:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:121:28: error: call to ‘__openat_too_many_args’ declared with attribute error: openat can be called either with 3 or 4 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:118:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:136:3: error: invalid use of ‘__builtin_va_arg_pack ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘openat64’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:154:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:155:30: error: call to ‘__openat64_too_many_args’ declared with attribute error: openat64 can be called either with 3 or 4 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:152:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:170:3: error: invalid use of ‘__builtin_va_arg_pack ()’

Where could the problem be? He mixed the project C/C++, but it is in part C. gcc 4.6.1, kernel 3.0.0

Edit: It turns out that when commenting on these lines, another “type” of errors like:

/usr/include/x86_64-linux-gnu/bits/stdio2.h: In function ‘sprintf’:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:34:3: error: invalid use of ‘__builtin_va_arg_pack ()’
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4 answers

Try compiling with -fno-builtins. If this fixes it, you obviously got some kind of problem, but probably not at your source.

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, -Wp,-D_FORTIFY_SOURCE=2. , rpmbuild, RPM_OPT_FLAGS

%build
export CFLAGS="$RPM_OPT_FLAGS"
export CXXFLAGS="$RPM_OPT_FLAGS"
./configure …

,

OPT_FLAGS=`echo $RPM_OPT_FLAGS | sed 's/-Wp,-D_FORTIFY_SOURCE=2 //'`
export CFLAGS="$OPT_FLAGS"
export CXXFLAGS="$OPT_FLAGS"
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I hit this while trying to compile https://www.spec.org/cpu2017/Docs/benchmarks/602.gcc_s.html using GCC.

Ironically, the boot process failed because GCC did not understand the GNU extension.

Inclusion -fgnu89-inlinegot rid of any problems that I had. Use as an alternative -std=gnu89.

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