Re: [notmuch] [PATCH 1/2] * avoid gcc 4.4.1 compiler warnings due to ignored write...

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+Sender: Jed Brown <five9a2@gmail.com>\r
+From: Jed Brown <jed@59A2.org>\r
+To: Dirk-Jan Binnema <djcb.bulk@gmail.com>, Jed Brown <jed@59a2.org>\r
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+References: <87skc5yd6v.wl%djcb@djcbsoftware.nl>\r
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+Date: Mon, 23 Nov 2009 17:38:42 +0100\r
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+Cc: "notmuch@notmuchmail org" <notmuch@notmuchmail.org>, djcb@djcbsoftware.nl\r
+Subject: Re: [notmuch] [PATCH 1/2] * avoid gcc 4.4.1 compiler warnings due\r
+ to ignored write return values\r
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+\r
+On Mon, 23 Nov 2009 18:14:12 +0200, Dirk-Jan Binnema <djcb.bulk@gmail.com> wrote:\r
+> Did you try it with -O2? Without optimizations many of the warnings are not\r
+> issued.\r
+\r
+Yes,\r
+\r
+$ cat > foo.c\r
+#include <stdlib.h>\r
+#include <unistd.h>\r
+int main()\r
+{\r
+  malloc(5);\r
+  write(2,0,10);\r
+  return 0;\r
+}\r
+$ gcc -static -std=c89 -O0 -Wall -Wextra -pedantic -o foo foo.c\r
+$ objdump -d -M intel foo |grep -A12 '<main>'\r
+00000000004002a4 <main>:\r
+  4002a4:       55                      push   rbp\r
+  4002a5:       48 89 e5                mov    rbp,rsp\r
+  4002a8:       bf 05 00 00 00          mov    edi,0x5\r
+  4002ad:       e8 6e 61 00 00          call   406420 <__libc_malloc>\r
+  4002b2:       ba 0a 00 00 00          mov    edx,0xa\r
+  4002b7:       be 00 00 00 00          mov    esi,0x0\r
+  4002bc:       bf 02 00 00 00          mov    edi,0x2\r
+  4002c1:       e8 ea a0 00 00          call   40a3b0 <__libc_write>\r
+  4002c6:       b8 00 00 00 00          mov    eax,0x0\r
+  4002cb:       c9                      leave  \r
+  4002cc:       c3                      ret    \r
+  4002cd:       90                      nop\r
+$ gcc -v\r
+Using built-in specs.\r
+Target: x86_64-unknown-linux-gnu\r
+Configured with: ../configure --prefix=/usr --enable-shared --enable-languages=c,c++,fortran,objc,obj-c++,ada --enable-threads=posix --mandir=/usr/share/man --infodir=/usr/share/info --enable-__cxa_atexit --disable-multilib --libdir=/usr/lib --libexecdir=/usr/lib --enable-clocale=gnu --disable-libstdcxx-pch --with-tune=generic\r
+Thread model: posix\r
+gcc version 4.4.2 (GCC)\r
+$ uname -a\r
+Linux kunyang 2.6.31-ARCH #1 SMP PREEMPT Tue Nov 10 19:01:40 CET 2009 x86_64 Intel(R) Core(TM)2 Duo CPU P8700 @ 2.53GHz GenuineIntel GNU/Linux\r
+\r
+\r
+Seems fishy.\r
+\r
+Jed\r