[ajay saxena <aileronajay@xxxxxxxxx>]

Also clang documentation (https://clang.llvm.org/docs/UsersManual.html) states

Building a relocatable precompiled header requires two additional arguments. First, pass the --relocatable-pch flag to indicate that the resulting PCH file should be relocatable. Second, pass -isysroot /path/to/build, which makes all includes for your library relative to the build directory. For example:

# clang -x c-header --relocatable-pch -isysroot /path/to/build /path/to/build/mylib.h mylib.h.pch

When loading the relocatable PCH file, the various headers used in the PCH file are found from the system header root. For example, mylib.h can be found in /usr/include/mylib.h. If the headers are installed in some other system root, the -isysroot option can be used provide a different system root from which the headers will be based. For example, -isysroot /Developer/SDKs/MacOSX10.4u.sdk will look for mylib.h in /Developer/SDKs/MacOSX10.4u.sdk/usr/include/mylib.h.

On Sat, Apr 22, 2017 at 8:14 PM, ajay saxena <aileronajay@xxxxxxxxx> wrote:

Hi Guy,

So i was able to find what is causing the issue. It is the -isysroot option.

The -sysroot option is also present when make tries to compile the c file in wireshark. When i add this flag to compilation of my test file, my test file fails to compile and clang stops searching in /usr/local/include

Ajays-MacBook-Pro:scripts ajasaxen$ cc -v -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk importtest.c

Apple LLVM version 8.1.0 (clang-802.0.42)

Target: x86_64-apple-darwin16.5.0

Thread model: posix

InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.12.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name importtest.c -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu penryn -target-linker-version 278.4 -v -dwarf-column-info -debugger-tuning=lldb -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -fdebug-compilation-dir /Users/ajasaxen/scripts -ferror-limit 19 -fmessage-length 163 -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.12.0 -fencode-extended-block-signature -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/c4/55pxmrx11s720rx49cxb3brc0000gn/T/importtest-ce55a6.o -x c importtest.c

clang -cc1 version 8.1.0 (clang-802.0.42) default target x86_64-apple-darwin16.5.0

ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/local/include"

ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/Library/Frameworks"

#include "..." search starts here:

#include <...> search starts here:

 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0/include

 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include

 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include

 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/System/Library/Frameworks (framework directory)

End of search list.

importtest.c:1:10: fatal error: 'gcrypt.h' file not found

#include <gcrypt.h>

         ^

1 error generated.

If i remove this option, the compilation succeeds for my test file. I think if we are able to avoid this option, the make for wireshark will work too.

Thanks,

Ajay

On Sat, Apr 22, 2017 at 4:47 PM, ajay saxena <aileronajay@xxxxxxxxx> wrote:

In the Makefile of epan/dissectors, I modified the AM_CPPFLAGS to add -v flag and removed the /usr/local/include that I had earlier added as hack to get the pack-ip.c to compile. Below is the verbose output from the compile

make[6]: Nothing to be done for `all'.

  CC       packet-ip.lo

Apple LLVM version 8.1.0 (clang-802.0.42)

Target: x86_64-apple-darwin16.5.0

Thread model: posix

InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.12.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -disable-free -disable-llvm-verifier -discard-value-names -main-file-name packet-ip.c -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu penryn -target-linker-version 278.4 -v -dwarf-column-info -debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=lldb -coverage-file /Users/ajasaxen/gitHubProjects/wireshark-official/wireshark/epan/dissectors/.libs/packet-ip.o -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0 -dependency-file .deps/packet-ip.Tpo -sys-header-deps -MP -MT packet-ip.lo -isystem /usr/local/Cellar/glib/2.50.3/include/glib-2.0 -isystem /usr/local/Cellar/glib/2.50.3/lib/glib-2.0/include -isystem /usr/local/opt/gettext/include -isystem /usr/local/Cellar/pcre/8.39/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -D HAVE_CONFIG_H -I . -I ../.. -I ../.. -I ../../epan -D _FORTIFY_SOURCE=2 -D G_DISABLE_SINGLE_INCLUDES -D G_DISABLE_DEPRECATED -D _REENTRANT -I /usr/local/Cellar/gnutls/3.5.8/include -I /usr/local/Cellar/nettle/3.3/include -I /usr/local/Cellar/libtasn1/4.10/include -I /usr/local/Cellar/p11-kit/0.23.3/include/p11-kit-1 -I /usr/local/opt/libgcrypt/include -I /usr/local/opt/libgpg-error/include -I /usr/include/libxml2 -D PIC -O2 -Werror -Wall -Wextra -Wendif-labels -Wpointer-arith -Wformat-security -Wvla -Waddress -Wattributes -Wdiv-by-zero -Wignored-qualifiers -Wpragmas -Wno-overlength-strings -Wno-long-long -Wheader-guard -Wc++-compat -Wunused-const-variable -Wshadow -Wno-pointer-sign -Wold-style-definition -Wstrict-prototypes -Wshorten-64-to-32 -Werror=implicit -fdebug-compilation-dir /Users/ajasaxen/gitHubProjects/wireshark-official/wireshark/epan/dissectors -ferror-limit 19 -fmessage-length 163 -fvisibility hidden -fwrapv -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.12.0 -fencode-extended-block-signature -fmax-type-align=16 -fno-common -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o .libs/packet-ip.o -x c packet-ip.c

clang -cc1 version 8.1.0 (clang-802.0.42) default target x86_64-apple-darwin16.5.0

ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/local/include"

ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/Library/Frameworks"

ignoring duplicate directory "../.."

#include "..." search starts here:

#include <...> search starts here:

 .

 ../..

 ../../epan

 /usr/local/Cellar/gnutls/3.5.8/include

 /usr/local/Cellar/nettle/3.3/include

 /usr/local/Cellar/libtasn1/4.10/include

 /usr/local/Cellar/p11-kit/0.23.3/include/p11-kit-1

 /usr/local/opt/libgcrypt/include

 /usr/local/opt/libgpg-error/include

 /usr/include/libxml2

 /usr/local/Cellar/glib/2.50.3/include/glib-2.0

 /usr/local/Cellar/glib/2.50.3/lib/glib-2.0/include

 /usr/local/opt/gettext/include

 /usr/local/Cellar/pcre/8.39/include

 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0/include

 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include

 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include

 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/System/Library/Frameworks (framework directory)

End of search list.

packet-ip.c:63:10: fatal error: 'GeoIP.h' file not found

#include <GeoIP.h>

         ^

1 error generated.

make[6]: *** [packet-ip.lo] Error 1

make[5]: *** [all-recursive] Error 1

make[4]: *** [all] Error 2

make[3]: *** [all-recursive] Error 1

make[2]: *** [all] Error 2

make[1]: *** [all-recursive] Error 1

make: *** [all] Error 2

On Sat, Apr 22, 2017 at 3:51 PM, Guy Harris <guy@xxxxxxxxxxxx> wrote:

On Apr 21, 2017, at 8:50 PM, ajay saxena <aileronajay@xxxxxxxxx> wrote:

> Here is the verbose output from that compile
>
> Ajays-MacBook-Pro:scripts ajasaxen$ gcc -v importtest.c -o importtest
> Apple LLVM version 8.1.0 (clang-802.0.42)
> Target: x86_64-apple-darwin16.5.0
> Thread model: posix
> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
>  "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.12.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name importtest.c -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu penryn -target-linker-version 278.4 -v -dwarf-column-info -debugger-tuning=lldb -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0 -fdebug-compilation-dir /Users/ajasaxen/scripts -ferror-limit 19 -fmessage-length 169 -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.12.0 -fencode-extended-block-signature -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/c4/55pxmrx11s720rx49cxb3brc0000gn/T/importtest-8e4727.o -x c importtest.c
> clang -cc1 version 8.1.0 (clang-802.0.42) default target x86_64-apple-darwin16.5.0
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/local/include
>  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0/include
>  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
>  /usr/include
>  /System/Library/Frameworks (framework directory)
>  /Library/Frameworks (framework directory)
> End of search list.
>  "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -lto_library /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/libLTO.dylib -no_deduplicate -dynamic -arch x86_64 -macosx_version_min 10.12.0 -o importtest /var/folders/c4/55pxmrx11s720rx49cxb3brc0000gn/T/importtest-8e4727.o -lSystem /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0/lib/darwin/libclang_rt.osx.a
>
> and in this compile /usr/local/include was searched. Whereas when it compiles wireshark, it does not search in /usr/local/include.

Try modifying epan/dissectors/Makefile to pass the -v flag to gcc, and then touch epan/dissectors/packet-ip.c and run a make, so we can see the gcc -v output when trying to compile it.

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