[CodeStyle] fix pragma-pack warning on macos

[GreatV]

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Fix pragma-pack warning on macOS.

cat before.log | grep "\[\-W" |grep -v party | awk '{print $NF}'|sort|uniq -c|sort -nr
   4 [-Wc++17-extensions]
   2 [-Wexceptions]
   1 [-Wunknown-warning-option]
   1 [-Wreturn-type-c-linkage]
   1 [-Wpragma-pack]

cat after.log | grep "\[\-W" |grep -v party | awk '{print $NF}'|sort|uniq -c|sort -nr
   4 [-Wc++17-extensions]
   2 [-Wexceptions]
   1 [-Wreturn-type-c-linkage]

• [CodeStyle] Compiler Warning tracking issue #47143

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[luotao1]

为什么[-Wunknown-warning-option] 这个也消失了呢？

[GreatV]

为什么[-Wunknown-warning-option] 这个也消失了呢？

看了一下都是 eigen3 引入的，一个日志里有单独一行[-Wunknown-warning-option]，另一个没有。很奇怪。

2022-10-27 20:58:33 5 warnings generated.
2022-10-27 20:58:33 [-Wunknown-warning-option]
2022-10-27 20:58:33     #pragma clang diagnostic ignored "-Wimplicit-int-float-conversion"

[GreatV]

怀疑是日志没有及时写入，导致多出来的。都是Eigen/src/Core/util/DisableStupidWarnings.h引入的，报了有7700+相同的warning，时间上来不及，导致日志错位。这个warning目前应该可以忽略。
另外下载了一个最近成功的CI，也有几行错位：

2022-10-28 02:04:13 /home/Paddle/build/third_party/eigen3/src/extern_eigen3/unsupported/Eigen/CXX11/../../../Eigen/src/Core/util/DisableStupidWarnings.h:48:38: warning: unknown warning group '-Wimplicit-int-float-conversion', ignored [-Wunknown-warning-option]
2022-10-28 02:04:13     #ableStupidWarnings.h:48:38: warning: unknown warning group '-Wimplicit-int-float-conversion', ignored [-Wunknown-warning-option]
2022-10-28 02:04:13     #pragma clang diagnostic ignored "-Wimplicit-int-float-conversion"
...
2022-10-28 02:04:15 [ 33%] Building CXX object paddle/phi/kernels/CMakeFiles/phi_cpu.dir/cpu/prior_box_kernel.cc.o
2022-10-28 02:04:15 [ 33%] Building CXX object paddle/phi/kernels/CMakeFiles/phi_cpu.dir/cpu/psroi_pool_kernel.cc.o
2022-10-28 02:04:15 unsupported/Eigen/CXX11/../../../Eigen/src/Core/util/DisableStupidWarnings.h:48:38: warning: unknown warning group '-Wimplicit-int-float-conversion', ignored [-Wunknown-warning-option]
2022-10-28 02:04:15     #pragma clang diagnostic ignored "-Wimplicit-int-float-conversion"

@luotao1 @zhiqiu

[GreatV]

这个warning在apple clang 10中出现，在apple clang 14中就没有了，应该是能识别到-Wimplicit-int-float-conversion这个flag了。

➜ clang --version
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: arm64-apple-darwin22.1.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

➜ cat ./0.log | grep "\[\-W" |grep -v party | awk '{print $NF}'|sort|uniq -c|sort -nr  
  26 [-Wnon-c-typedef-for-linkage]
  25 [-Wdeprecated-declarations]
   7 [-Wdangling-gsl]
   4 [-Wc++17-extensions]
   4 [-Walign-mismatch]
   2 [-Wexceptions]
   1 [-Wreturn-type-c-linkage]
   1 [-Wpragma-pack]

➜ cat ./1.log | grep "\[\-W" |grep -v party | awk '{print $NF}'|sort|uniq -c|sort -nr
  26 [-Wnon-c-typedef-for-linkage]
  25 [-Wdeprecated-declarations]
   7 [-Wdangling-gsl]
   4 [-Wc++17-extensions]
   2 [-Wexceptions]
   1 [-Wunused-value]
   1 [-Wreturn-type-c-linkage]

[luotao1]

Got it. LGTM