Re: [PATCH] libsanitizer/mips: always build with largefile support

[YunQiang Su]

Hans-Peter Nilsson  于2023年1月11日周三 08:53写道：
>
> On Fri, 6 Jan 2023, YunQiang Su wrote:
>
> > -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 is always used for mips
> > when build libsanitizer in LLVM. Thus
> >FIRST_32_SECOND_64((_MIPS_SIM == _ABIN32) ? 176 : 160, 216);
> > instead of
> >FIRST_32_SECOND_64((_MIPS_SIM == _ABIN32) ? 160 : 144, 216);
> > in sanitizer_platform_limits_posix.h.
> >
> > To keep sync with LLVM and to make the code simple, we use the
> > largefile options always.
> >
> > libsanitizer/
> >   * configure.ac: set -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
> > always for mips*.
> >   * configure: Regenerate.
>
> Hm, yes, that might be the most pragmatic way to solve the mips
> stat-size issue...  But shouldn't then largefile-options also be
> forced when libsanitizer is *used*?  IOW, mips*-linux
> gcc-options be tweaked to include -D_LARGEFILE_SOURCE
> -D_FILE_OFFSET_BITS=64 conditional on sanitizer-options?
>

Sound a good idea...
While I am worrying about some application may fail to build or
trigger some other problems.

> brgds, H-P

Re: [PATCH] libsanitizer/mips: always build with largefile support

[Hans-Peter Nilsson]

On Fri, 6 Jan 2023, YunQiang Su wrote:

> -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 is always used for mips
> when build libsanitizer in LLVM. Thus
>FIRST_32_SECOND_64((_MIPS_SIM == _ABIN32) ? 176 : 160, 216);
> instead of
>FIRST_32_SECOND_64((_MIPS_SIM == _ABIN32) ? 160 : 144, 216);
> in sanitizer_platform_limits_posix.h.
> 
> To keep sync with LLVM and to make the code simple, we use the
> largefile options always.
> 
> libsanitizer/
>   * configure.ac: set -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
> always for mips*.
>   * configure: Regenerate.

Hm, yes, that might be the most pragmatic way to solve the mips
stat-size issue...  But shouldn't then largefile-options also be 
forced when libsanitizer is *used*?  IOW, mips*-linux 
gcc-options be tweaked to include -D_LARGEFILE_SOURCE 
-D_FILE_OFFSET_BITS=64 conditional on sanitizer-options?

brgds, H-P

[PATCH] libsanitizer/mips: always build with largefile support

[YunQiang Su]

-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 is always used for mips
when build libsanitizer in LLVM. Thus
   FIRST_32_SECOND_64((_MIPS_SIM == _ABIN32) ? 176 : 160, 216);
instead of
   FIRST_32_SECOND_64((_MIPS_SIM == _ABIN32) ? 160 : 144, 216);
in sanitizer_platform_limits_posix.h.

To keep sync with LLVM and to make the code simple, we use the
largefile options always.

libsanitizer/
* configure.ac: set -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
  always for mips*.
* configure: Regenerate.
---
 libsanitizer/configure| 13 ++---
 libsanitizer/configure.ac | 12 ++--
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/libsanitizer/configure b/libsanitizer/configure
index d3de3dbba51..d4ee0fac3e7 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -17045,9 +17045,16 @@ else
 $as_echo "no" >&6; }
 fi
 
-EXTRA_CFLAGS="$EXTRA_CFLAGS $CET_FLAGS"
-EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS $CET_FLAGS"
-EXTRA_ASFLAGS=$CET_FLAGS
+# Always set -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 to sync with LLVM,
+# and keep struct *stat* have the same size.
+case "${host}" in
+  mips*-*) FILE64_FLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" ;;
+  *) FILE64_FLAGS="" ;;
+esac
+
+EXTRA_CFLAGS="$EXTRA_CFLAGS $CET_FLAGS $FILE64_FLAGS"
+EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS $CET_FLAGS $FILE64_FLAGS"
+EXTRA_ASFLAGS="$CET_FLAGS $FILE64_FLAGS"
 
 
 
diff --git a/libsanitizer/configure.ac b/libsanitizer/configure.ac
index ad49f29db7e..04cd8910ed6 100644
--- a/libsanitizer/configure.ac
+++ b/libsanitizer/configure.ac
@@ -416,8 +416,16 @@ GCC_BASE_VER
 
 # Add CET specific flags if Intel CET is enabled.
 GCC_CET_FLAGS(CET_FLAGS)
-EXTRA_CFLAGS="$EXTRA_CFLAGS $CET_FLAGS"
-EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS $CET_FLAGS"
+
+# Always set -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 to sync with LLVM,
+# and keep struct *stat* have the same size.
+case "${host}" in
+  mips*-*) FILE64_FLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" ;;
+  *) FILE64_FLAGS="" ;;
+esac
+
+EXTRA_CFLAGS="$EXTRA_CFLAGS $CET_FLAGS $FILE64_FLAGS"
+EXTRA_CXXFLAGS="$EXTRA_CXXFLAGS $CET_FLAGS $FILE64_FLAGS"
 EXTRA_ASFLAGS=$CET_FLAGS
 AC_SUBST(EXTRA_ASFLAGS)
 AC_SUBST(EXTRA_CFLAGS)
-- 
2.30.2